Monongahela River at Braddock, PA

1997 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 1996 TO SEPTEMBER 1997
                                               DAILY MEAN VALUES

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

  1     10800    10100    32300    17200    16700    11400    19000     9050    13800     5360     3220     2950
  2      9550    10400    56900    14500    12700    50200    20100     7790    11800     4260     2300     2900
  3      8760     8960    52500    14200    10700    77600    15900     9170    14300     4330     2290     3260
  4      8070     8140    34800    13600    13200    70800    14100     7670    18800     3800     2060     2710
  5      7240     8660    34500    11700    19200    51400    13800     7540    21500     3500     2400     2280

  6      6310     8600    30400    11700    23600    40800    11900     8130    18200     3830     3270     2080
  7      5820     7890    26800    11900    16800    42600    10400     9470    11000     2600     3800     2500
  8      5570    20200    23700     9790    17700    39500    11300     9380     7910     3000     2440     2130
  9      5110    59300    20200     9070    13100    36700     8980     8700     6910     2190     2940     2880
 10      5420    46900    19800    10400    12000    28000     6640    14500     6830     2440     1970     3700

 11      5490    34300    13800     9920    12600    29500     6330    17200     6240     3960     1970     3480
 12      5710    31700    22400     6350    10700    29700     6160    19500     4910     3230     1860     5110
 13      4700    26400    29800     6640    11400    27100     5520    19100     7590     2490     2630     3220
 14      5150    23300    32300     6170    11200    28800     6840    16900     8570     2870     3590     3060
 15      4080    18400    28300     6140    12100    19000     6880    19400     6980     2370     2700     2720

 16      4480    14700    19700     6070    13700    16500     5230    18000     6300     1910     2980     3290
 17      4320    10500    19700     7470    11700    17200     5440    16300     6950     1880     4800     3280
 18      4950     8760    17700     5500    12100    17600     6460     8370     5720     2620    22000     2630
 19      8480    10100    15200     4060    11700    21600     5660    11400     6710     2120    14400     2840
 20     26300    10800    14300     5660    17100    25200     5550    21500     5780     2270     9280     2600

 21     40500    13000    12200     7280    24600    27800     6170    26900     4330     2210     8930     2890
 22     37800    11300    10800     6660    21600    25800     7360    21100     4450     2090    12200     3530
 23     39800     9540     8850     6980    18900    20200     6100    17700     4120     2370     7130     3020
 24     32300     8240    10600     9020    16600    18400     5870    13900     2870     3270     5760     3380
 25     26000     8980    17600    14700    14500    16900     7270    23500     3270     5070     3950     2880

 26     18300    13900    21100    13200    11600    25800     6010    56400     3240     5170     3730     2800
 27     13900    29400    15800    17100    11400    35500     4930    45100     6950     4220     2790     3170
 28     12800    29500    14700    21900    11700    28300     6060    33700     8250     3420     3360     3030
 29     12500    27800    15600    30300      ---    25300     9950    28800     6110     3560     3730    10700
 30     14100    26600    18700    25300      ---    21300    10900    21500     5060     3910     3400    18000
 31     11600      ---    19100    21500      ---    19300      ---    17100      ---     4230     2520      ---

TOTAL  405910   556370   710150   361980   410900   945800   262810   564770   245450   100550   150400   113020
MEAN    13090    18550    22910    11680    14680    30510     8760    18220     8182     3244     4852     3767
MAX     40500    59300    56900    30300    24600    77600    20100    56400    21500     5360    22000    18000
MIN      4080     7890     8850     4060    10700    11400     4930     7540     2870     1880     1860     2080
CFSM     1.78     2.53     3.12     1.59     2.00     4.16     1.19     2.48     1.12      .44      .66      .51
IN.      2.06     2.82     3.60     1.84     2.08     4.80     1.33     2.86     1.24      .51      .76      .57

                                             MONONGAHELA RIVER BASIN

                              03085000  MONONGAHELA RIVER AT BRADDOCK, PA--Continued

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1939 - 1997, BY WATER YEAR (WY)

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

MEAN     5455     9438    15900    17210    20810    24150    18690    14280     9115     6290     5901     4713
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 1996 CALENDAR YEAR        FOR 1997 WATER YEAR           WATER YEARS 1939 - 1997

ANNUAL TOTAL                     7724750                    4828110
ANNUAL MEAN                        21110                      13230                      12610
HIGHEST ANNUAL MEAN                                                                      18440              1996
LOWEST ANNUAL MEAN                                                                        6946              1954
HIGHEST DAILY MEAN                188000     Jan 20           77600     Mar  3          188000       Jan 20 1996
LOWEST DAILY MEAN                   2780     Sep  2            1860     Aug 12             703       Sep  3 1946a
ANNUAL SEVEN-DAY MINIMUM            3330     Aug 30            2160     Jul 16             839       Nov 17 1953
INSTANTANEOUS PEAK FLOW                                       83400     Mar  2          210000       Jan 20 1996
INSTANTANEOUS PEAK STAGE                                         18.67  Mar  2             b31.20    Jun  5 1941
ANNUAL RUNOFF (CFSM)                   2.88                       1.80                       1.72
ANNUAL RUNOFF (INCHES)                39.17                      24.48                      23.36
10 PERCENT EXCEEDS                 41000                      28300                      29300
50 PERCENT EXCEEDS                 15700                       9790                       7780
90 PERCENT EXCEEDS                  5400                       2870                       2260

   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 current year.
  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 do to malfunctions of the equipment.  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 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.

EXTREMES FOR CURRENT YEAR.--
  WATER TEMPERATURE:  Maximum, 30.0`C, July 25; minimum 0.5`C, January 19, 20, 21, 29, 30.


                          WATER-QUALITY DATA, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996

                            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
       17...       0945   4310       392      7.8     16.5      736     10.6      120      33       8.5     26
     NOV
       05...       0945   8620       270      7.3     10.5      745     10.3       91      26       6.3     14
     DEC
       18...       0945  19100       247      7.4      6.0      735     12.6       80      22       6.0     12
     JAN
       31...       0900  21900       294      7.3      4.0      733     13.9       88      25       6.3     16
     FEB
       11...       0930  12000       295      7.3      3.0      740     12.6       86      24       6.3     18
     MAR
       04...       1130  73100       199      7.2      8.0      739     11.2       71      21       4.6      7.7
     APR
       23...       1000   6250       392      7.6     13.0      727     10.3      130      35       9.6     23
     MAY
       22...       0800  23800       235      7.6     15.5      744      9.3       76      22       5.3     12
     JUN
       17...       1000   7560       395      7.7     22.0      733      8.0      120      35       8.8     24
     JUL
       24...       1000   2950       461      7.9     27.0      741      7.6      140      40      10       32
     AUG
       19...       0850  13400       467      7.6     25.5      741      7.3      140      37      10       35
     SEP
       08...       0930   2100       418      7.9     23.0      736      8.2      120      33       8.9     29


                                             MONONGAHELA RIVER BASIN

                             03085000  MONONGAHELA RIVER AT BRADDOCK, PA.--Continued


                          WATER-QUALITY DATA, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997

                           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
       17...        2.1      54     110       16       0.10     4.4      238     0.020    0.840    0.080     0.20
     NOV
       05...        1.6      40      71        9.9     0.10     5.2      160     0.020    0.750    0.090    <0.20
     DEC
       18...        1.1      40      62       10       0.10     5.1      142     0.010    0.740    0.090    <0.20
     JAN
       31...        1.4      37      74       17       0.10     4.7      173     0.020    0.760    0.180     0.40
     FEB
       11...        1.3      42      67       18       0.10     4.9      174     0.020    0.890    0.100    <0.20
     MAR
       04...        1.5      28      44        9.5    <0.10     4.9      116    <0.010    0.930    0.090     1.4
     APR
       23...        1.6      39     120       15      <0.10     4.7      243     0.015    0.766    0.104     0.38
     MAY
       22...        1.2      28      59        9.5     0.11     4.6      152     0.012    0.576    0.059     0.66
     JUN
       17...        2.2      48     100       19       0.16     5.2      241    <0.010    0.074    0.325     0.26
     JUL
       24...        2.4      40     130       25       0.17     2.8      287     0.026    1.02    <0.015     0.37
     AUG
       19...        2.3      42     140       13       0.16     3.6      298     0.016    0.803    0.042     0.37
     SEP
       08...        2.2      42     110       19       0.13     1.9      248     0.012    0.908    0.015     0.33



                  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
       17...       <0.20    0.010   <0.010   <0.010     33      32        1.5      0.40      6       95
     NOV
       05...       <0.20    0.020   <0.010   <0.010     28      98        1.9      0.50      8       90
     DEC
       18...       <0.20   <0.010   <0.010   <0.010     10     120        1.2      0.60      7       94
     JAN
       31...        0.30    0.030   <0.010   <0.010      8.0   160        1.5      0.90     24       83
     FEB
       11...       <0.20   <0.010   <0.010   <0.010     21     120        1.4      0.40      6       75
     MAR
       04...       <0.20    0.370   <0.010   <0.010     29      92        2.3     >5.0     304       93
     APR
       23...       <0.20    0.070    0.011   <0.010     38     147        1.2      0.60     38       77
     MAY
       22...       <0.20    0.168   <0.010   <0.010     33     120        1.5      0.50    250       34
     JUN
       17...        0.26   <0.010   <0.010   <0.010     18      32        2.6      0.90     27       79
     JUL
       24...        0.22    0.051    0.056   <0.010     17       1.4      2.0      0.90     12       53
     AUG
       19...       <0.20    0.050   <0.010   <0.010      3.2    10        2.1      1.1      37       86
     SEP
       08...       <0.20    0.034    0.010   <0.010     18      <1.0      1.7      1.7      14       65






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