Monongahela River at Braddock, PA

1998 Water-Year
Basic Fixed-Site Water-Quality Records
[drop]

--------
                                             MONONGAHELA RIVER BASIN

                                   03085000  MONONGAHELA RIVER AT BRADDOCK, PA
                                   (National water-quality assessment station)

LOCATION.--Lat 40`23'28", long 79`51'30", Allegheny County, Hydrologic Unit 05020005, near right bank on river
   guide wall 300 ft upstream from dam at lock 2 at Braddock, 1,700 ft downstream from Turtle Creek, and 11.2 mi
   upstream of confluence with Allegheny River.

DRAINAGE AREA.--7,337 mi2.

                                             WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--October 1938 to current year.  Monthly discharge only for some periods, published in WSP 1305.

GAGE.--Water-stage recorder and fixed-crest concrete dam control with streamward lock chamber usable as floodway
   during high flow since 1951.  Datum of gage is 709.66 ft above sea level (U.S. Army Corps of Engineers bench
   mark).  Prior to Aug. 13, 1951, at site 700 ft upstream, and Aug. 13, 1951 to Nov. 8, 1990 at present site at
   datum 2.50 ft lower.

REMARKS.--No estimated daily discharges.  Records good.  Flow regulated by locks and hydroelectric plants, since
   1938 by Tygart Lake, since 1926 by Lake Lynn, since 1925 by Deep Creek Reservoir, since 1943 by Youghiogheny
   River Lake, and since 1990 by Stonewall Jackson Lake, combined capacity, 779,000 acre-ft.  Figures of daily
   discharge include slight diversion from Beaver Run Reservoir in the Kiskiminetas River Basin to the borough of
   Jeannette in the Monongahela River Basin.  U.S. Army Corps of Engineers satellite telemeter at station.

EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Mar. 18, 1936 reached a stage of 38.8 ft from floodmarks, discharge,
   210,000 ft3/s.


                  DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
                                               DAILY MEAN VALUES

DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

  1     10300     2820    20100     8680    20300    33500    13600    15100     5850    46800     3080     2100
  2      8110     6000    21200    10000    18700    33800    14900    21700     6080    40500     2740     2220
  3      6440    11400    19600     8290    15000    30000    12000    33800     5600    29600     2550     2030
  4      5380    14300    13800     8340    12900    28100     9490    23200     4220    18300     3010     1990
  5      4860     7960    13300    16100    18800    23900     9280    29600     4070    11700     1930     2080

  6      3350     6130    13300    18000    23200    20200    10400    33600     3520     9090     2130     2200
  7      3930    19000    10300    23800    24000    17800    12000    29700     3070     7890     2200     2770
  8      3260    39900    11700    53200    20900    17500     8680    26000     3010     7980     2210     3460
  9      2690    38100     9470    73400    19200    29400    11000    30500     2990     8180     1980     3550
 10      3670    28200    10400    57100    19800    39500    27700    28700     2540     9960     2890     4180

 11      2880    23600    17000    38500    18200    35400    33100    22700     4600     7490     4900     2680
 12      2830    16600    24700    35700    17500    28400    24500    21400     4290     5630     5300     3580
 13      2760    12500    23900    32600    22000    24500    18500    20100     9380     4460     4650     2440
 14      3080    15000    17000    30600    22000    21000    13600    15900    18500     5040     3680     2320
 15      2480    21300    14000    25500    19900    17800    13900    14000    13400     3790     2820     2870

 16      2950    23300    12300    21800    17500    14800    11400    12600    29700     4140     4980     2430
 17      2460    16400    10800    20500    19300    11400     9950     9790    36200     3850     4880     1950
 18      2660    13300    10000    15700    21100     9750     8980     9510    32500     3240     7940     2600
 19      2230    11400     9100    15100    42400    24500    10700     6180    32400     2770     8170     1900
 20      2560     8790     7480    14800    39800    29800    35500     6450    56400     2810     8030     2710

 21      2780     9170     5680    12900    37500    33300    43600     5850    44100     3260     6560     2630
 22      2490    11300     5550    13000    34100    52200    37300     5620    29900     4700     4910     3220
 23      2320    18400     6790    14500    30600    43000    34800     4640    20400     3060     3390     2970
 24      3000    19500     6530    27000    38100    35000    25300     4550    16000     3520     4710     2530
 25      2840    16400     8070    25700    36300    30100    18000     7630    12000     3840     4070     3220

 26      2820    12700    12000    19700    27400    24100    13800     6370     7560     3940     3880     2440
 27      3230    10000    15700    18700    25600    21200    21000     4160     9130     3110     2810     2220
 28      2620    10600    12300    21200    28100    16600    21600     4440    20000     3450     2230     3950
 29      3260    15600    11400    31000      ---    19300    18600     4800    44700     3220     2370     2180
 30      3230    13900    14000    23700      ---    15300    14200     4050    55200     3560     2400     2160
 31      2350      ---    10700    21800      ---    13000      ---     3770      ---     3470     2590      ---

TOTAL  109820   473570   398170   756910   690200   794150   557380   466410   537310   272350   119990    79580
MEAN     3543    15790    12840    24420    24650    25620    18580    15050    17910     8785     3871     2653
MAX     10300    39900    24700    73400    42400    52200    43600    33800    56400    46800     8170     4180
MIN      2230     2820     5550     8290    12900     9750     8680     3770     2540     2770     1930     1900
CFSM      .48     2.15     1.75     3.33     3.36     3.49     2.53     2.05     2.44     1.20      .53      .36
IN.       .56     2.40     2.02     3.84     3.50     4.03     2.83     2.36     2.72     1.38      .61      .40


                                             MONONGAHELA RIVER BASIN

                              03085000  MONONGAHELA RIVER AT BRADDOCK, PA--Continued

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1939 - 1998, BY WATER YEAR (WY)

          OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

MEAN     5423     9546    15850    17330    20870    24180    18690    14300     9262     6331     5867     4678
MAX     23130    42130    37600    36150    43120    54500    39180    40310    30240    15620    23720    18290
(WY)     1980     1986     1973     1952     1956     1963     1940     1996     1981     1958     1956     1971
MIN      1200      971     2748     3389     6387     8042     6473     3352     2107     1765     1531     1005
(WY)     1954     1954     1954     1977     1954     1969     1971     1982     1965     1966     1957     1946

SUMMARY STATISTICS           FOR 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1939 - 1998

ANNUAL TOTAL                     4137240                    5255840
ANNUAL MEAN                        11330                      14400                      12640
HIGHEST ANNUAL MEAN                                                                      18440              1996
LOWEST ANNUAL MEAN                                                                        6946              1954
HIGHEST DAILY MEAN                 77600     Mar  3           73400     Jan  9          188000       Jan 20 1996
LOWEST DAILY MEAN                   1860     Aug 12            1900     Sep 19             703       Sep  3 1946a
ANNUAL SEVEN-DAY MINIMUM            2160     Jul 16            2170     Aug 31             839       Nov 17 1953
INSTANTANEOUS PEAK FLOW                                       79500     Jan  9          210000       Jan 20 1996
INSTANTANEOUS PEAK STAGE                                         18.42  Jan  9             b31.20    Jun  5 1941
ANNUAL RUNOFF (CFSM)                   1.54                       1.96                       1.72
ANNUAL RUNOFF (INCHES)                20.98                      26.65                      23.42
10 PERCENT EXCEEDS                 23400                      32500                      29400
50 PERCENT EXCEEDS                  8370                      11300                       7800
90 PERCENT EXCEEDS                  2630                       2630                       2270

   a  Also Sept. 4, 22, 1946.
   b  Maximum gage height, 31.39 ft., June 24, 1972 (backwater from Allegheny River).  Datum then in use.


                                             MONONGAHELA RIVER BASIN

                              03085000  MONONGAHELA RIVER AT BRADDOCK, PA--Continued
                                   (National Water-Quality Assessment station)

                                              WATER-QUALITY RECORDS

PERIOD OF RECORD.--October 1958 to September 1993 (discontinued). September 1994 to current year.

PERIOD OF DAILY RECORD.--
   SPECIFIC CONDUCTANCE:  January 1973 to October 1975.
   WATER TEMPERATURE:  January 1973 to September 1979, November 1996 to September 1998.
   SUSPENDED SEDIMENT DISCHARGE:  January 1973 to September 1979.

INSTRUMENTATION.--From January 1973 to September 1979, specific conductance and water temperature were once daily
   readings by an observer.  From January 1973 to September 1979, suspended-sediment samples were collected   
   daily and more often during storm events by an observer.  From November 1996 to current year, daily records
   of water temperature were measured and collected at hourly intervals with an in-situ probe and electronic  
   data logger.

REMARKS.--All water-quality samples were collected and analyzed by the U.S. Geological Survey.  Interruptions
   in the daily record were due to malfunctions of the equipment.  Water temperature data from the in-situ probes
   often times did not exactly agree with the water temperature of the monthly and storm samples because of the
   fixed location of the in-situ temperature probes.  Additional sites in the (NAWQA) fixed-station network are
   shown in figure 6 on page 28.  An explanation of selected abbreviations used in the water-quality tables are   
   given on pages 29-31.

EXTREMES FOR PERIOD OF DAILY RECORD.--
   WATER TEMPERATURE:  Maximum, 30.0`C, on several days during the summer periods; minimum, 0.0`C, on several
   days each year before 1979 water year.
   SEDIMENT CONCENTRATIONS:  Maximum daily, 830 µg/L, March 15, 19, 1978; minimum daily, 2 µg/L,
   November 29, 1976.
   SEDIMENT DISCHARGES:  Maximum daily, 210,000 tons, January 12, 1974; minimum daily, 14 tons, February 8, 1977.


                          WATER-QUALITY DATA, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998

                         DIS-              PH               BARO-
                       CHARGE,   SPE-     WATER             METRIC            HARD-             MAGNE-
                        INST.    CIFIC    WHOLE             PRES-             NESS    CALCIUM    SIUM,  SODIUM,
                        CUBIC    CON-     FIELD   TEMPER-    SURE   OXYGEN,   TOTAL    DIS-      DIS-    DIS-
                         FEET    DUCT-   (STAND-   ATURE     (MM      DIS-    (MG/L    SOLVED   SOLVED  SOLVED
      DATE      TIME     PER     ANCE      ARD     WATER      OF     SOLVED    AS      (MG/L    (MG/L    (MG/L
                        SECOND  (µS/CM)   UNITS)  (DEG C)    HG)     (MG/L)   CACO3)   AS CA)   AS MG)   AS NA)
                       (00061)  (00095)  (00400)  (00010)  (00025)  (00300)  (00900)  (00915)  (00925)  (00930)

  OCT
    06...       0845    3100      443      7.6     21.5      741      8.4      140     38       10       30
  NOV
    24...       1145   20900      267      7.5      7.0      747     12.2       84     24        6.1     14
  DEC
    17...       0920   10500      255      7.3      5.0      735     12.3      170     48       13       87
  JAN
    10...       0950   56400      200      7.4      8.0      740     11.0       65     19        4.4      9.7
    29...       0940   30400      280      7.3      5.0      734     12.3       88     25        6.4     14
  FEB
    19...       1045   44600      302      7.4      6.0      735     11.7       91     25        6.8     16
  MAR
    09...       0920   29600      271      7.5      8.0      721     11.9       92     25        6.9     14
  APR
    07...       0925   13700      301      7.6     13.0      738      9.9       99     27        7.5     16
  MAY
    12...       1010   20700      226      7.5     16.0      748      9.5       77     22        5.5     11
  JUN
    04...       1030    4350      375      7.4     23.0      748      7.3      120     33        8.7     24
  JUL
    09...       0945    8510      259      7.3     25.0      750      7.4       85     25        5.8     13
  AUG
    10...       1045    2640      442      7.4     28.0      752      6.5      130     37        9.3     32
  SEP
    04...       1000    1690      456      7.9     27.0      746      8.0      140     38        9.8     33



                                             MONONGAHELA RIVER BASIN

                                   03085000  MONONGAHELA RIVER AT BRADDOCK, PA.


                          WATER-QUALITY DATA, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998

                        ALKA-                                       SOLIDS,   NITRO-   NITRO-   NITRO-   NITRO-
               POTAS-  LINITY             CHLO-    FLUO-   SILICA,  RESIDUE    GEN,     GEN,     GEN,   GEN,AM-
                SIUM,  WAT DIS  SULFATE   RIDE,    RIDE,    DIS-    AT 180   NITRITE  NO2+NO3  AMMONIA  MONIA +
                DIS-   TOT IT    DIS-     DIS-      DIS-    SOLVED   DEG. C    DIS-     DIS-     DIS-   ORGANIC
               SOLVED   FIELD    SOLVED   SOLVED   SOLVED   (MG/L     DIS-    SOLVED   SOLVED   SOLVED   TOTAL
      DATE     (MG/L   MG/L AS   (MG/L    (MG/L    (MG/L     AS      SOLVED   (MG/L    (MG/L    (MG/L    (MG/L
               AS K)    CACO3   AS SO4)   AS CL)   AS F)    SIO2)    (MG/L)   AS N)    AS N)    AS N)    AS N)
              (00935)  (39086)  (00945)  (00940)  (00950)  (00955)  (70300)  (00613)  (00631)  (00608)  (00625)

  OCT
    06...      2.4        41     140      18        .18     3.3       278      .010     .889     .047     .37
  NOV
    24...      1.9        30      67      12       <.10     4.9       161     <.010     .725     .061     .22
  DEC
    17...      2.3        25     110      60        .22     6.3       426      .010     .547    <.020    <.10
  JAN
    10...      1.4        24      40      12        .11     5.1       129     <.010     .803     .037     .66
    29...      1.3        28      74      11        .11     5.0       172     <.010     .668     .136     .27
  FEB
    19...      1.4        31      71      15        .10     5.1       177     <.010     .690     .119     .47
  MAR
    09...      1.2        29      67      12       <.10     5.0       157     <.010     .587     .078     .20
  APR
    07...      1.3        30      86      10       <.10     4.6       185      .012     .612     .070     .21
  MAY
    12...      1.2        28      57       8.0     <.10     4.9       135      .012     .522     .084     .24
  JUN
    04...      2.0        42     100      20        .14     4.6       228      .031     ---      .083     .33
  JUL
    09...      1.8        33      60      12        .10     4.8       158      .012     .695     .053     .28
  AUG
    10...      3.0        37     120      26        .19     3.5       262      .025    1.20      .076     .53
  SEP
    04...      2.4        38     130      25        .19     2.9       288      .030    1.27      .086     .37




               NITRO-                     PHOS-                              CARBON,             SED.
              GEN,AM-            PHOS-   PHORUS             MANGA-  CARBON,  ORGANIC             SUSP.
              MONIA +   PHOS-   PHORUS    ORTHO,   IRON,    NESE,   ORGANIC   SUS-     SEDI-    SIEVE
              ORGANIC  PHORUS     DIS-    DIS-      DIS-     DIS-    DIS-    PENDED    MENT,     DIAM.
               DIS.     TOTAL    SOLVED  SOLVED    SOLVED   SOLVED  SOLVED    TOTAL    SUS-    % FINER
      DATE     (MG/L    (MG/L    (MG/L   (MG/L     (µG/L    (µG/L    (MG/L    (MG/L    PENDED    THAN
               AS N)    AS P)    AS P)   AS P)     AS FE)   AS MN)   AS C)    AS C)    (MG/L)  .062 MM
              (00623)  (00665)  (00666)  (00671)  (01046)  (01056)  (00681)  (00689)  (80154)  (70331)

  OCT
    06...      <.20      .013    <.010    <.010     17        9.4     1.8       .30       7      97
  NOV
    24...       .17      .012    <.010     .015     17       95       1.6       .90      16      96
  DEC
    17...      <.10      .010     .010     .030     15       36       1.4      <.20       7      80
  JAN
    10...       .18      .136    <.010    <.010     19      152       1.8      1.4      149      92
    29...       .21      .016    <.010    <.010    <10      132       1.2       .90      22      82
  FEB
    19...       .17      .097    <.010     .020     15      117       1.5      2.3       65      84
  MAR
    09...       .11      .020    <.010     .010     15      120       1.2       .60      17      86
  APR
    07...       .10      .016    <.010    <.010     28      127       1.0       .30       8      62
  MAY
    12...       .16      .033    <.010     .011     17       48       1.2       .60      14      80
  JUN
    04...       .19     <.010    <.010     .083     20       70       1.6       .20      20      97
  JUL
    09...       .23      .040     .013     .029     23       49       2.0       .60      34      92
  AUG
    10...       .28      .083    <.010    <.010    <10       21       2.6      1.0       47      92
  SEP
    04...       .21      .025    <.010     .013     20        4.3     2.0       .60      15      69


                                             MONONGAHELA RIVER BASIN

                              03085000  MONONGAHELA RIVER AT BRADDOCK, PA--Continued

REMARKS.--The following data are for disolved trace elements in surface water filtered through a 0.45mm filter.


                          WATER-QUALITY DATA, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998

                              DIS-
                            CHARGE,   ALUM-    ANTI-                      BERYL-            CHRO-
                             INST.    INUM,    MONY,   ARSENIC  BARIUM,   LIUM,   CADMIUM   MIUM,   COBALT,
                             CUBIC     DIS-     DIS-     DIS-    DIS-     DIS-      DIS-    DIS-     DIS-
                              FEET    SOLVED   SOLVED   SOLVED  SOLVED    SOLVED   SOLVED   SOLVED  SOLVED
           DATE      TIME     PER     (µG/L    (µG/L    (µG/L    (µG/L    (µG/L    (µG/L    (µG/L    (µG/L
                             SECOND   AS AL)   AS SB)   AS AS)   AS BA)   AS BE)   AS CD)   AS CR)   AS CO)
                            (00061)  (01106)  (01095)  (01000)  (01005)  (01010)  (01025)  (01030)  (01035)

       SEP
         04...       1000   1690       25      <1.0      <1        48     <1.0     <1.0     <1.0     <1.0




                                          MANGA-   MOLYB-            SELE-            URANIUM
                       COPPER,   LEAD,    NESE,    DENUM,  NICKEL,   NIUM,   SILVER,  NATURAL   ZINC,
                        DIS-      DIS-     DIS-     DIS-    DIS-      DIS-     DIS-     DIS-     DIS-
                        SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED
               DATE     (µG/L    (µG/L    (µG/L    (µG/L    (µG/L    (µG/L    (µG/L    (µG/L    (µG/L
                        AS CU)   AS PB)   AS MN)   AS MO)   AS NI)   AS SE)   AS AG)   AS U)    AS ZN)
                       (01040)  (01049)  (01056)  (01060)  (01065)  (01145)  (01075)  (22703)  (01090)

           SEP
             04...       1.9     <1.0       4.3     1.6      2.6      <1      <1.0     <1.0      8.7

                                             MONONGAHELA RIVER BASIN

                              03085000  MONONGAHELA RIVER AT BRADDOCK, PA--Continued


                  WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998

 DAY      MAX     MIN    MEAN       MAX     MIN    MEAN       MAX     MIN    MEAN       MAX     MIN    MEAN

                OCTOBER                 NOVEMBER                  DECEMBER                    JANUARY

   1      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
   2      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
   3      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
   4      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
   5      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---

   6      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
   7      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
   8      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
   9      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  10      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---

  11      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  12      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  13      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  14      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  15      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---

  16      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  17      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  18      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  19      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  20      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---

  21      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  22      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  23      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  24      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  25      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---

  26      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  27      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  28      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  29      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  30      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---
  31      ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---

 MONTH    ---     ---     ---       ---     ---     ---       ---     ---     ---       ---     ---     ---

                                             MONONGAHELA RIVER BASIN

                              03085000  MONONGAHELA RIVER AT BRADDOCK, PA--Continued


                  WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998

 DAY      MAX     MIN    MEAN       MAX     MIN    MEAN       MAX     MIN    MEAN       MAX     MIN    MEAN

               FEBRUARY                   MARCH                     APRIL                       MAY

   1      ---     ---     ---       ---     ---     ---      15.0    14.0    14.5      15.0    14.5    15.0
   2      ---     ---     ---       ---     ---     ---      14.5    13.5    14.0      15.0    14.5    14.5
   3      ---     ---     ---       ---     ---     ---      14.0    13.5    13.5      15.0    14.0    14.5
   4      ---     ---     ---       ---     ---     ---      13.5    12.5    13.0      15.5    14.5    15.0
   5      ---     ---     ---       ---     ---     ---      13.0    12.0    12.5      15.5    15.0    15.5

   6      ---     ---     ---       ---     ---     ---      13.0    12.5    13.0      15.5    14.5    15.0
   7      ---     ---     ---       ---     ---     ---      13.5    13.0    13.0      15.5    15.0    15.5
   8      ---     ---     ---       ---     ---     ---      14.0    13.0    13.5      16.0    15.5    15.5
   9      ---     ---     ---       ---     ---     ---      14.5    13.0    14.0      15.5    15.5    15.5
  10      ---     ---     ---       7.5     6.0     7.0      13.0    11.0    12.0      16.0    15.0    15.5

  11      ---     ---     ---       6.0     4.5     5.0      11.5    10.5    11.0      16.0    15.5    16.0
  12      ---     ---     ---       4.5     3.5     4.0      12.5    11.0    11.5      16.0    15.5    16.0
  13      ---     ---     ---       4.5     3.5     4.0      13.5    11.5    12.5      17.5    15.5    16.5
  14      ---     ---     ---       5.5     4.5     4.5      13.5    13.0    13.0      18.5    17.0    17.5
  15      ---     ---     ---       5.5     5.0     5.0      14.5    13.5    14.0      19.5    18.5    19.0

  16      ---     ---     ---       6.0     4.5     5.5      15.0    14.0    14.5      20.0    19.5    19.5
  17      ---     ---     ---       6.0     5.5     6.0      15.0    14.5    14.5      20.5    19.5    20.0
  18      ---     ---     ---       7.0     6.0     6.5      14.5    14.5    14.5      21.5    20.5    21.0
  19      ---     ---     ---       7.0     6.0     6.5      14.5    13.0    14.0      22.0    21.0    21.5
  20      ---     ---     ---       7.0     6.0     6.5      13.0    12.5    12.5      23.0    22.0    22.5

  21      ---     ---     ---       7.5     6.5     7.0      13.0    12.0    12.5      23.0    23.0    23.0
  22      ---     ---     ---       6.5     6.5     6.5      13.0    12.5    13.0      23.5    22.5    23.0
  23      ---     ---     ---       6.5     6.0     6.5      12.5    12.0    12.5      23.0    22.0    22.5
  24      ---     ---     ---       6.5     6.0     6.5      13.0    12.0    12.5      22.5    22.0    22.5
  25      ---     ---     ---       7.0     6.0     6.5      14.5    12.5    13.5      23.0    21.5    22.5

  26      ---     ---     ---       8.5     7.0     7.5      14.5    13.0    14.0      22.5    22.0    22.5
  27      ---     ---     ---      10.5     8.5     9.5      13.5    13.0    13.5      22.0    21.5    22.0
  28      ---     ---     ---      12.0    10.5    11.0      14.0    13.0    13.5      23.0    21.5    22.5
  29      ---     ---     ---      12.5    11.0    11.5      14.5    13.5    14.0      24.5    23.0    23.5
  30      ---     ---     ---      13.5    12.0    13.0      15.0    14.5    14.5      25.0    24.0    24.5
  31      ---     ---     ---      14.5    13.0    13.5       ---     ---     ---      25.5    24.0    25.0

 MONTH    ---     ---     ---      14.5     3.5     7.3      15.0    10.5    13.3      25.5    14.0    19.2


                                             MONONGAHELA RIVER BASIN

                              03085000  MONONGAHELA RIVER AT BRADDOCK, PA--Continued


                  WATER TEMPERATURE, DEGREES CELSIUS, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998

 DAY      MAX     MIN    MEAN       MAX     MIN    MEAN       MAX     MIN    MEAN       MAX     MIN    MEAN

                 JUNE                     JULY                     AUGUST                    SEPTEMBER

   1     25.0    24.0    24.5      21.5    21.0    21.5      27.0    26.0    26.5      27.0    26.5    26.5
   2     25.0    22.5    24.0      21.0    20.5    21.0      26.5    26.0    26.5      27.0    26.0    26.5
   3     23.5    23.0    23.5      21.5    20.5    20.5      27.5    26.5    27.0      26.5    25.5    26.0
   4      ---     ---     ---      21.5    21.0    21.5      27.5    26.5    27.0      26.5    25.5    26.0
   5     22.0    21.0    21.5      22.0    21.0    21.5      29.0    27.5    28.0      26.5    26.0    26.0

   6     21.5    20.5    21.0      23.0    21.5    22.5      29.0    27.5    28.0      27.0    26.0    26.0
   7     21.0    20.0    20.5      24.0    22.5    23.0      29.0    27.5    28.0      27.0    25.0    26.5
   8     20.5    20.0    20.5      24.0    23.5    24.0      29.5    28.0    28.5      25.0    24.5    25.0
   9     20.5    20.0    20.5      25.0    24.0    24.5      30.0    28.5    29.0      24.5    23.5    24.0
  10     20.0    20.0    20.0      25.5    24.5    25.0      29.5    27.0    28.0      24.5    23.0    23.5

  11     21.5    19.5    20.0      25.0    24.5    25.0      29.5    28.0    28.5      24.5    23.5    24.5
  12     23.0    21.5    22.0      25.5    24.5    25.0      31.0    28.5    29.5      24.0    23.0    23.5
  13     24.0    22.5    23.0      26.0    25.0    25.5      31.0    28.5    29.5      26.0    22.0    24.5
  14     24.0    22.0    23.0      26.5    25.5    26.0      29.0    27.5    28.5      25.0    24.0    24.5
  15     22.5    22.0    22.0      26.5    26.5    26.5      28.5    27.5    28.0      25.5    24.5    25.0

  16     22.5    22.0    22.0      26.5    26.0    26.5      28.5    27.0    27.5      26.0    25.0    25.5
  17     22.0    21.0    21.5      26.5    26.0    26.5      30.0    28.5    29.0      26.5    26.0    26.0
  18     21.0    20.5    20.5      27.0    26.5    26.5      29.5    27.5    28.5      26.5    26.0    26.5
  19     21.0    20.0    20.5      27.0    26.5    26.5      28.5    27.5    28.0      27.0    26.5    26.5
  20     20.0    19.0    19.5      27.0    26.5    27.0      28.0    26.5    27.5      27.0    26.5    27.0

  21     20.5    19.5    19.5      27.5    27.0    27.0      28.0    27.0    27.5      27.0    27.0    27.0
  22     21.5    20.5    21.0      28.5    27.0    27.5      27.5    26.5    27.0      27.5    26.5    27.0
  23     22.0    21.0    21.5      29.0    28.5    28.5      27.5    27.0    27.5      26.5    25.5    26.0
  24     23.0    22.0    22.5      28.5    28.0    28.5      28.0    27.5    28.0      25.5    24.5    25.0
  25     24.0    22.5    23.0      28.0    27.5    28.0      27.5    26.5    27.0      25.0    24.0    24.5

  26     25.0    23.5    24.0      28.5    27.5    28.0      26.5    26.0    26.0      25.0    23.5    24.0
  27     25.0    24.5    24.5      28.5    27.5    28.0      26.0    26.0    26.0      25.5    24.5    25.0
  28     25.0    23.5    24.5      27.5    27.0    27.5      26.5    26.0    26.5      25.0    24.0    24.5
  29     23.5    22.5    23.0      27.5    27.0    27.5      27.0    26.5    26.5      25.5    24.5    25.0
  30     22.5    21.5    22.0      28.0    27.0    27.5      27.5    26.5    27.0      25.5    24.5    25.0
  31      ---     ---     ---      28.0    27.0    27.5      27.5    27.0    27.5       ---     ---     ---

 MONTH   25.0    19.0    21.9      29.0    20.5    25.5      31.0    26.0    27.7      27.5    22.0    25.4






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