HEART RIVER BASIN

                                           06345500  HEART RIVER NEAR RICHARDTON, ND

LOCATION.--Lat 4644'46", long 10218'27", in NE1/4 sec.29, T.138 N., R.92 W., Stark County, Hydrologic Unit 10130202, on right
   bank 50 ft upstream from bridge on State Highway 8, 0.5 mi downstream from Plum Creek and 9.5 mi south of Richardton.

DRAINAGE AREA.--1,240 mi2, approximately.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--May 1903 to September 1922, April 1943 to current year. Monthly discharge only for some periods, published in
   WSP 1309.

REVISED RECORDS (WATER YEARS).--WSP 1209: Drainage area. WSP 1239: 1906, 1918(M), 1947(M).

GAGE.--Water-stage recorder. Datum of gage is 2,153.67 ft above sea level. May 18, 1903, to Sept. 30, 1922, nonrecording gage at
   3 sites in 1 mi reach below present site at different datums. Apr. 14, 1943, to July 7, 1947, nonrecording gage at present
   site and datum.

REMARKS.--Records good except for periods of estimated discharge, which are fair. Flow is regulated by E.A. Patterson Lake
   (station 06343500), 85 river miles upstream, since 1950. Some diversions for irrigation and water supply at low flow.

EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of July 5, 1938, reached a stage of about 26 ft, from information by local residents,
   discharge, 16,000 ft3/s; flood of Mar. 25, 1943, reached a stage of 24.2 ft from floodmarks, discharge, 11,700 ft3/s.

                          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        16       19    e13       16       e9.0       81       24     16       12        8.0      9.3     6.1
          2        16       19    e13       15      e11         72       25     16       12        7.3      9.5     5.2
          3        16       19    e13       13       14         54       25     16       12        7.1     10       4.9
          4        16       19    e12       12       16         45       25     16       15        7.1     10       4.7
          5        17       19    e12      e11       16         37       24     14       18        7.9     10       3.8

          6        17       19    e12      e11       15         39       23     14       23       14       10       2.7
          7        17       19    e12      e11       15         36       22     15       21       23       10       2.1
          8        17       20    e11      e10       15         31       21     23       16       24       10       1.4
          9        17       20    e11      e10       16        e30       20     25       13       21        9.8     1.1
         10        17       20    e11       e9.8     16        e29       20     27       11       17        9.0      .75

         11        17       21    e11       e9.5     15        e28       19     25        9.2     16        9.1      .56
         12        19       22    e11       e9.3     15        e27       18     23        8.2     24        9.5      .56
         13        20       22    e10       e9.0     14        e26       18     21        9.4     25        8.8      .80
         14        20       22    e10       e8.9     14         26       19     20       12       27        7.9     1.3
         15        20       21    e10       e8.8     14         25       18     19       13       21        8.2     2.6

         16        20       17    e10       e8.7     14         24       20     18       20       19        8.1     3.0
         17        20       16    e10       e8.7     14         24       20     16       22       17        7.9     3.7
         18        21       16    e10       e8.6     15         25       22     15       22       20        8.2     5.7
         19        21       17    e10       e8.6     15         27       22     14       21       21        8.3     7.0
         20        21       17     e9.5     e8.6     15         28       20     14       20       23        8.5     5.8

         21        20       17     e9.5     e8.6     15         27       19     13       18       24        8.9     6.3
         22        20       17     e9.5     e8.5     15         27       18     12       15       18        8.1    e7.0
         23        21       17     10       e8.5     17         27       16     11       12       15        8.1    e7.5
         24        20       17     10       e8.5     28         29       16     10       11       14        9.7    e8.5
         25        20      e16     12       e8.5     38         29       18      8.7      9.5     13       11      e9.0

         26        20      e16     15       e8.4     45         29       18      8.5      9.1     13       10      e9.0
         27        20      e15     16       e8.4     47         28       19      9.3      9.6     13        9.2    e8.5
         28        19      e14     17       e8.4     48         27       18      9.1     12       12        8.9    e8.0
         29        19      e14     17       e8.3     57         26       17      8.9     10       11        8.0    e7.5
         30        20      e14     17       e8.3      ---       25       16      9.5      9.1     10        7.2    e6.5
         31        19      ---     17       e8.3      ---       24      ---     12        ---      9.5      7.0      ---

        TOTAL     583      541    371.5    300.2    598.0     1012      600    479.0    425.1    501.9    278.2   141.57
        MEAN     18.8     18.0     12.0     9.68     20.6     32.6     20.0     15.5     14.2     16.2     8.97     4.72
        MAX        21       22       17       16       57       81       25       27       23       27       11      9.0
        MIN        16       14      9.5      8.3      9.0       24       16      8.5      8.2      7.1      7.0      .56
        AC-FT    1160     1070      737      595     1190     2010     1190      950      843      996      552      281

        STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1903 - 2000, BY WATER YEAR (WY)

        MEAN     17.1     13.7     9.05     8.84     46.1      373      325      103      162     68.4     30.1     11.8
        MAX       240      114     52.5      112      643     2125     2160     1318     1225      584      401     86.4
        (WY)     1983     1983     1983     1973     1982     1945     1950     1970     1906     1969     1909     1986
        MIN       .10     1.93     1.00     .000     .000     1.66     5.77     2.78      .37      .40     .000     .000
        (WY)     1961     1961     1920     1962     1950     1964     1905     1992     1961     1919     1991     1958

        SUMMARY STATISTICS           FOR 1999 CALENDAR YEAR        FOR 2000 WATER YEAR           WATER YEARS 1903 - 2000

        ANNUAL TOTAL                       44351.5                     5831.47
        ANNUAL MEAN                          122                         15.9                       98.1
        HIGHEST ANNUAL MEAN                                                                        316              1982
        LOWEST ANNUAL MEAN                                                                           5.18           1961
        HIGHEST DAILY MEAN                  3000     Mar  2              81     Mar  1           17000       Apr 17 1950
        LOWEST DAILY MEAN                      9.5   Dec 20                .56  Sep 11                .00    Jul 26 1903
        ANNUAL SEVEN-DAY MINIMUM               9.8   Dec 16                .92  Sep  8                .00    Jul 26 1903
        INSTANTANEOUS PEAK FLOW                                         129     Mar  2           23400       Apr 16 1950
        INSTANTANEOUS PEAK STAGE                                          6.61  Mar  2              28.05    Apr 16 1950
        INSTANTANEOUS LOW FLOW                                                                        .00    Jul 26 1903
        ANNUAL RUNOFF (AC-FT)              87970                      11570                      71070
        10 PERCENT EXCEEDS                   212                         25                        126
        50 PERCENT EXCEEDS                    21                         15                         12
        90 PERCENT EXCEEDS                    12                          8.1                        2.0

       e  Estimated
       
       
                                                     WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water years 1950, 1972 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
           06...       1325    17         --       --       --     1910     14.0      9.0       --       --       --
         NOV
           15...       1530    20         --       --       --     1970     17.0      7.0       --       --       --
         JAN
           14...       1030     8.9       --       --       --     2470     -2.0       .1       --       --       --
         FEB
           14...       1510    14         --       --       --     2280       .5       .2       --       --       --
         MAR
           13...       1640    26        7.9      7.9     1460     1340     10.5      2.5      410     76.0     53.0
           27...       1030    29         --       --       --     1890     10.0      7.0       --       --       --
         APR
           27...       0930    19         --       --       --     2060     13.0     13.0       --       --       --
         JUN
           21...       1115    19         --       --       --     1890     23.0     18.5       --       --       --
         AUG
           21...       1500     8.9      8.5       --     2290     2240     25.0     22.5      420     69.0     61.0


                                                                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
                06...        --       --       --       --       --       --       --       --       --       --
              NOV
                15...        --       --       --       --       --       --       --       --       --       --
              JAN
                14...        --       --       --       --       --       --       --       --       --       --
              FEB
                14...        --       --       --       --       --       --       --       --       --       --
              MAR
                13...       9.8       4       180      48       249     15.0       .4      570     75.6     1090
                27...        --       --       --       --       --       --       --       --       --       --
              APR
                27...        --       --       --       --       --       --       --       --       --       --
              JUN
                21...        --       --       --       --       --       --       --       --       --       --
              AUG
                21...      13.0       8       370      65       376     28.0       .4      810     38.9     1620


                          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
                06...        --       --       --       --       --       --       --       --       --       --
              NOV
                15...        --       --       --       --       --       --       --       --       --       --
              JAN
                14...        --       --       --       --       --       --       --       --       --       --
              FEB
                14...        --       --       --       --       --       --       --       --       --       --
              MAR
                13...      1050     <1.0      80       <1      30.0      80        .1      <1      <1.0     1000
                27...        --       --       --       --       --       --       --       --       --       --
              APR
                27...        --       --       --       --       --       --       --       --       --       --
              JUN
                21...        --       --       --       --       --       --       --       --       --       --
              AUG
                21...      1580     <1.0      10        1      60.0      40       <.1       5      <1.0     1100

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