HEART RIVER BASIN

                                           06347500  BIG MUDDY CREEK NEAR ALMONT, ND

LOCATION.--Lat 4641'40", long 10128'01", in NE1/4NE1/4SE1/4 sec.12, T.137 N., R.86 W., Morton County, Hydrologic Unit
   10130203, on left bank 50 ft downstream from county highway bridge, 2 mi downstream from Hailstone Creek, 3 mi southeast of
   Almont and 12 mi upstream from mouth.

DRAINAGE AREA.--456 mi2.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--October 1945 to September 1970, October 1970 to September 1973 (annual maximum discharge), February 1991 to
   current year (seasonal records only since February 1991).

GAGE.--Water-stage recorder. Elevation of gage is 1,864 ft above sea level, by barometer. Prior to Sept. 5, 1952, nonrecording
   gage at same site and datum.

REMARKS.--Records good except for periods of estimated record, which are poor.

EXTREMES FOR CURRENT YEAR.--Maximum discharge, 711 ft3/s, July 12, gage height, 11.46 ft; minimum daily discharge recorded,
   0.54 ft3/s, Sept. 17.

                          DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
                                                       DAILY MEAN VALUES

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

          1       ---      ---      ---      ---     e2.0     e180       17     23        5.4      9.4      4.3     1.7
          2       ---      ---      ---      ---     e2.0     e170       16     21        5.3      9.2      5.2     1.7
          3       ---      ---      ---      ---     e2.0     e160       16     19        4.9      9.0      5.6     1.9
          4       ---      ---      ---      ---     e2.0      151       16     18        5.8      6.7      7.6     2.2
          5       ---      ---      ---      ---     e2.0      136       15     16        6.1      5.9      9.0     2.2

          6       ---      ---      ---      ---     e2.0     e118       13     14        4.9      8.9      9.6     2.3
          7       ---      ---      ---      ---     e2.0     e100       13     14        5.5     17       11       2.2
          8       ---      ---      ---      ---     e2.0       81       13     17        4.6     26        9.6     1.8
          9       ---      ---      ---      ---     e2.0       64       14     21        4.4     22        8.3     1.7
         10       ---      ---      ---      ---     e2.0       63       14     23        4.2     16        7.5     1.5

         11       ---      ---      ---      ---     e2.0       59       12     25        3.8    179        7.4     1.2
         12       ---      ---      ---      ---     e2.0       41       11     26        3.7    391        7.5      .87
         13       ---      ---      ---      ---     e2.0       39       10     28       36       69        6.7      .75
         14       ---      ---      ---      ---     e2.0       33       11     29       96       37        6.3      .76
         15       ---      ---      ---      ---     e2.0      e28       11     30       72       23        5.7      .74

         16       ---      ---      ---      ---     e2.0      e25       11     27       55       16        5.1      .58
         17       ---      ---      ---      ---     e2.0      e24       12     24       58       11        4.8      .54
         18       ---      ---      ---      ---     e2.0      e23       13     21       47       11        4.2      .66
         19       ---      ---      ---      ---     e2.0       22       14     19       43       10        3.8      .63
         20       ---      ---      ---      ---     e2.0       24       14     17       41        8.2      3.9      .61

         21       ---      ---      ---      ---     e2.0       24       15     15       37        8.2      4.2      .80
         22       ---      ---      ---      ---     e2.0       24       15     13       34        6.7      3.8     1.1
         23       ---      ---      ---      ---     e3.0       24       14     11       40        5.4      3.1     1.2
         24       ---      ---      ---      ---     e3.0       23       13      9.5     30        4.5      2.6     1.1
         25       ---      ---      ---      ---     e5.0       24       19      8.2     24        4.3      2.2     1.0

         26       ---      ---      ---      ---    e20         23       29      7.4     23        3.5      2.3      .91
         27       ---      ---      ---      ---    e50         22       43      7.9     18        3.0      2.3      .74
         28       ---      ---      ---      ---   e120         20       39      7.1     16        2.5      1.9      .80
         29       ---      ---      ---      ---   e150         19       31      6.7     12        2.2      1.8     1.0
         30       ---      ---      ---      ---      ---       18       27      6.9      9.6      1.9      1.8     1.0
         31       ---      ---      ---      ---      ---       18      ---      5.6      ---      2.6      1.8      ---

        TOTAL     ---      ---      ---      ---    395.0     1780      511    530.3    750.2    930.1    160.9    36.19
        MEAN      ---      ---      ---      ---     13.6     57.4     17.0     17.1     25.0     30.0     5.19     1.21
        MAX       ---      ---      ---      ---      150      180       43       30       96      391       11      2.3
        MIN       ---      ---      ---      ---      2.0       18       10      5.6      3.7      1.9      1.8      .54
        AC-FT     ---      ---      ---      ---      783     3530     1010     1050     1490     1840      319       72

        STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1946 - 2000, BY WATER YEAR (WY)

        MEAN     1.20     1.60     1.33     1.08     21.1      149      154     48.5     40.6     44.6     8.77     2.94
        MAX      2.61     3.19     2.48     4.59      220      909     1160      540      405     1042     75.4     15.2
        (WY)     1952     1952     1952     1947     1995     1997     1950     1970     1966     1993     1998     1953
        MIN       .39      .58      .35     .065     .000      .73     1.48     1.01      .43     .042      .12      .35
        (WY)     1962     1961     1949     1949     1966     1965     1992     1961     1961     1961     1961     1991

        SUMMARY STATISTICS                  WATER YEARS 1946 - 2000

        ANNUAL MEAN                          a 37.0
        HIGHEST ANNUAL MEAN                 a 112              1950
        LOWEST ANNUAL MEAN                    a 1.41           1961
        HIGHEST DAILY MEAN                  15000       Apr 17 1950
        LOWEST DAILY MEAN                        .00    Jan 28 1946
        ANNUAL SEVEN-DAY MINIMUM                 .00    Jan 28 1946
        INSTANTANEOUS PEAK FLOW             20200       Apr 17 1950
        INSTANTANEOUS PEAK STAGE               30.99    Jul 23 1993
        ANNUAL RUNOFF (AC-FT)             a 26790
        10 PERCENT EXCEEDS                     46
        50 PERCENT EXCEEDS                      2.0
        90 PERCENT EXCEEDS                       .40

        a  Based on complete water years only (1946-70)
        e  Estimated
        
        
                                                     WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water year 1991 to current year.

                                 WATER-QUALITY DATA, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000

                                DIS-     PH       PH       SPE-
                              CHARGE,   WATER    WATER    CIFIC    SPE-                       HARD-             MAGNE-
                               INST.    WHOLE    WHOLE     CON-    CIFIC                      NESS    CALCIUM    SIUM,
                               CUBIC    FIELD     LAB     DUCT-    CON-    TEMPER-  TEMPER-   TOTAL    DIS-      DIS-
                                FEET   (STAND-  (STAND-   ANCE     DUCT-    ATURE    ATURE    (MG/L    SOLVED   SOLVED
             DATE      TIME     PER      ARD      ARD      LAB     ANCE      AIR     WATER     AS      (MG/L    (MG/L
                               SECOND   UNITS)   UNITS)  (US/CM)  (US/CM)  (DEG C)  (DEG C)   CACO3)   AS CA)   AS MG)
                              (00061)  (00400)  (00403)  (90095)  (00095)  (00020)  (00010)  (00900)  (00915)  (00925)

         OCT
           13...       1510      3.7      --       --       --     2340      9.0      8.5       --       --       --
         FEB
           28...       1310    133        --       --       --     1640     13.0      3.0       --       --       --
         MAR
           31...       1140     18       8.5      8.3       --     2430      9.0      6.0      470     79.0     66.0
         APR
           18...       1240     13        --       --       --     2620     13.5     10.5       --       --       --
         JUL
           12...       1200    377        --       --       --      890     30.0     25.0       --       --       --
         AUG
           28...       1110      2.2     8.4      8.4     2250     2240     19.5     21.0      280     41.0     44.0


                                                                ANC                                        SOLIDS,
                           POTAS-   SODIUM                    UNFLTRD   CHLO-    FLUO-            SOLIDS,  RESIDUE
                            SIUM,     AD-   SODIUM,           TIT 4.5   RIDE,    RIDE,   SULFATE    DIS-   AT 180
                            DIS-    SORP-    DIS-               LAB     DIS-      DIS-    DIS-     SOLVED   DEG. C
                           SOLVED    TION   SOLVED             (MG/L    SOLVED   SOLVED   SOLVED   (TONS     DIS-
                  DATE     (MG/L    RATIO    (MG/L    SODIUM    AS      (MG/L    (MG/L    (MG/L     PER     SOLVED
                           AS K)             AS NA)  PERCENT   CACO3)   AS CL)   AS F)   AS SO4)    DAY)    (MG/L)
                          (00935)  (00931)  (00930)  (00932)  (90410)  (00940)  (00950)  (00945)  (70302)  (70300)

              OCT
                13...        --       --       --       --       --       --       --       --       --       --
              FEB
                28...        --       --       --       --       --       --       --       --       --       --
              MAR
                31...      13.0       9       430      66       482      5.8       .4      920     88.5     1820
              APR
                18...        --       --       --       --       --       --       --       --       --       --
              JUL
                12...        --       --       --       --       --       --       --       --       --       --
              AUG
                28...       9.6      11       440      76       674      7.9       .8      550      9.25    1550


                          SOLIDS,
                          SUM OF                                        MANGA-            MOLYB-   SELE-    STRON-
                          CONSTI-  ARSENIC   IRON,    LEAD,   LITHIUM   NESE,   MERCURY   DENUM,   NIUM,     TIUM,
                          TUENTS,    DIS-     DIS-     DIS-     DIS-     DIS-     DIS-     DIS-     DIS-     DIS-
                            DIS-    SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED   SOLVED
                  DATE     SOLVED   (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L    (UG/L
                           (MG/L)   AS AS)   AS FE)   AS PB)   AS LI)   AS MN)   AS HG)   AS MO)   AS SE)   AS SR)
                          (70301)  (01000)  (01046)  (01049)  (01130)  (01056)  (71890)  (01060)  (01145)  (01080)

              OCT
                13...        --       --       --       --       --       --       --       --       --       --
              FEB
                28...        --       --       --       --       --       --       --       --       --       --
              MAR
                31...      1800      1.0      70       <1      50.0      30       <.1      <1      <1.0     1000
              APR
                18...        --       --       --       --       --       --       --       --       --       --
              JUL
                12...        --       --       --       --       --       --       --       --       --       --
              AUG
                28...      1500      2.0      30       <1      60.0      10       <.1       4      <1.0      770

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