HEART RIVER BASIN

                                           06344600  GREEN RIVER NEAR NEW HRADEC, ND

LOCATION.--Lat 4701'40", long 10303'10", on line between secs.13 and 14, T.141 N., R.98 W., Billings County, Hydrologic Unit
   10130202, on left bank above county highway bridge, and 8 mi west of New Hradec.

DRAINAGE AREA.--152 mi2, approximately.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--February 1964 to current year.

GAGE.--Water-stage recorder. Elevation of gage is 2,510 ft above sea level, from topographic map.

REMARKS--Records fair except for periods of estimated discharge, which are poor.

                          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      e1.1     e1.1      1.7     1.6       .84     18        2.0     2.0      1.6       .37     e.15      .22
          2      e1.0     e1.1      1.8     1.4       .93     15        2.3     1.9      2.2       .32     e.15      .22
          3      e1.5     e1.1      1.8     1.3      1.1      12        2.3     1.8      2.3       .37     e.15      .23
          4      e2.0     e1.1      1.7     1.1      1.1      10        2.6     1.7      2.0       .44     e.14      .25
          5      e1.8      1.1      1.7     1.2      1.0       9.0      2.4     1.4      1.6       .55     e.14      .26

          6      e1.5      1.0      1.8     1.3      1.0       8.6      2.1     1.3      1.1       .77     e.14      .26
          7      e1.2      1.2      1.7     1.1      1.0       8.1      2.0     1.3       .88     1.2      e.13      .28
          8      e1.0      1.3      1.7     1.2      1.3       8.0      2.0     2.0       .79     2.3      e.13      .33
          9      e1.0      1.1      1.6     1.3      1.4      e6.5      2.0     2.3       .64     2.3      e.12      .42
         10      e1.0      1.1      1.4     1.4      1.3      e6.0      2.0     2.3       .57     1.9      e.11      .44

         11      e1.0      1.2      1.4     1.2     e1.3       5.4      1.8     1.9       .48     1.3      e.10      .48
         12      e1.0      1.3      1.3      .97     1.2       4.4      1.7     1.7       .41      .90     e.10      .48
         13      e1.5      1.3      1.3     e.90     1.1      e3.6      1.6     1.6       .51      .55     e.10      .46
         14      e1.4      1.4      1.4     e.90    e1.1      e3.4      2.1     1.7       .69      .47      .10      .44
         15      e1.3      1.5      1.4     e.90     1.1       3.0      2.3     1.8      1.2       .42      .10      .42

         16      e1.2      1.6      1.2     e.90    e1.0       2.7      2.4     1.8      1.9       .33      .08      .40
         17      e1.1     e1.5      1.2     e.90    e1.1       2.7      2.8     1.5      1.8       .28      .08      .40
         18      e1.3      1.6      1.2     e.80     1.2       2.6      3.9     1.3      1.8       .33      .07      .47
         19      e1.1      1.5     e1.2     e.80     1.2       2.7      5.6     1.1      1.7       .31      .07      .59
         20      e1.0      1.6     e1.1     e.80     1.2       2.7      4.7     1.0      1.6      e.30      .05      .53

         21      e1.0      1.7     e1.1     e.80     1.3       2.7      4.7     1.0      1.2      e.26      .04      .51
         22      e1.0      1.9     e1.1     e.80     1.7       2.6      3.8      .90     1.0      e.23      .02      .61
         23      e1.0      1.9     e1.1     e.80     3.0       2.7      3.3      .88      .94     e.22      .01      .57
         24      e1.0      1.8      1.1     e.80    12         2.9      3.1      .68     1.1      e.21      .00      .57
         25      e1.0      1.9      1.4     e.80    82         2.9      2.9      .53      .80     e.20      .00      .57

         26      e1.0      1.9      1.3     e.80    62         2.8      2.8      .55      .60     e.20      .00      .51
         27      e1.0      1.9      1.3     e.80    43         2.5      2.8      .79      .49     e.20      .00      .46
         28      e1.0      1.8      1.5     e.80    33         2.3      2.6     1.0       .44     e.19      .00      .40
         29      e1.0      1.7      1.6     e.80    23         2.1      2.4     2.0       .41     e.18      .02      .37
         30      e1.0      1.7      1.7      .89      ---      2.2      2.2     2.0       .40     e.17      .10      .35
         31      e1.0      ---      1.7      .90      ---      2.1      ---     1.5       ---     e.16      .20      ---

        TOTAL    36.0     43.9     44.5    30.96   283.47    162.2     81.2    45.23    33.15    17.93     2.60    12.50
        MEAN     1.16     1.46     1.44     1.00     9.77     5.23     2.71     1.46     1.11      .58     .084      .42
        MAX       2.0      1.9      1.8      1.6       82       18      5.6      2.3      2.3      2.3      .20      .61
        MIN       1.0      1.0      1.1      .80      .84      2.1      1.6      .53      .40      .16      .00      .22
        AC-FT      71       87       88       61      562      322      161       90       66       36      5.2       25

        STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1964 - 2000, BY WATER YEAR (WY)

        MEAN     3.26     1.73     1.00     1.34     9.09     60.0     40.3     18.0     18.7     12.8     3.70     1.75
        MAX      47.7     10.6     3.40     14.3     67.4      323      314      141      101      123     29.5     21.1
        (WY)     1983     1999     1999     1974     1983     1972     1975     1970     1970     1964     1981     1986
        MIN      .076      .31      .13     .000     .000      .33      .71      .60     .067     .000     .000     .000
        (WY)     1993     1993     1993     1993     1993     1964     1990     1992     1988     1988     1988     1994

        SUMMARY STATISTICS           FOR 1999 CALENDAR YEAR        FOR 2000 WATER YEAR           WATER YEARS 1964 - 2000

        ANNUAL TOTAL                        7969.99                     793.64
        ANNUAL MEAN                           21.8                        2.17                      14.3
        HIGHEST ANNUAL MEAN                                                                         35.9            1972
        LOWEST ANNUAL MEAN                                                                            .74           1992
        HIGHEST DAILY MEAN                  1190     Mar 16              82     Feb 25            2700       Mar 13 1972
        LOWEST DAILY MEAN                       .53  Jul 14                .00  Aug 24                .00    May 25 1964
        ANNUAL SEVEN-DAY MINIMUM                .61  Jul 11                .00  Aug 22                .00    May 31 1964
        INSTANTANEOUS PEAK FLOW                                          95     Feb 25            4120       May  9 1970
        INSTANTANEOUS PEAK STAGE                                          7.60  Feb 25            a 19.58    Mar 21 1997
        INSTANTANEOUS LOW FLOW                                                                        .00    May 25 1964
        ANNUAL RUNOFF (AC-FT)              15810                       1570                      10330
        10 PERCENT EXCEEDS                    37                          2.7                       14
        50 PERCENT EXCEEDS                     1.7                        1.2                        1.1
        90 PERCENT EXCEEDS                      .99                        .20                        .18

        a  Backwater from ice
        e  Estimated
        
        
                                                     WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water year 1984 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
           07...       1600     1.2       --       --       --     1130     16.0     10.1       --       --       --
         NOV
           17...       1005     1.5       --       --       --     1320     10.0      4.4       --       --       --
         DEC
           07...       1450     1.6       --       --       --     1670      5.0      1.8       --       --       --
         JAN
           13...       1010      .92      --       --       --     1520     -8.0       .5       --       --       --
         FEB
           15...       1025     1.0       --       --       --     1220     -2.0       .5       --       --       --
           29...       1440    24         --       --       --     2660      6.5      1.0       --       --       --
         MAR
           15...       0945     2.9      8.3       --     1150     1170     -7.0      2.2      190     36.0     23.0
           29...       1140     2.1       --       --       --     1220      6.5      6.0       --       --       --
         APR
           25...       1420     2.8       --       --       --     1800     19.0     16.5       --       --       --
         JUN
           21...       1440     1.2       --       --       --     1200     24.0     19.0       --       --       --
         AUG
           09...       0930      .12     8.3      8.4     1090     1090     27.5     22.5      200     32.0     28.0
           22...       1230      .01      --       --       --     1130     27.0     21.0       --       --       --


                                                                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
                07...        --       --       --       --       --       --       --       --       --       --
              NOV
                17...        --       --       --       --       --       --       --       --       --       --
              DEC
                07...        --       --       --       --       --       --       --       --       --       --
              JAN
                13...        --       --       --       --       --       --       --       --       --       --
              FEB
                15...        --       --       --       --       --       --       --       --       --       --
                29...        --       --       --       --       --       --       --       --       --       --
              MAR
                15...       8.7       6       190      68       236      7.9       .4      370      6.33     806
                29...        --       --       --       --       --       --       --       --       --       --
              APR
                25...        --       --       --       --       --       --       --       --       --       --
              JUN
                21...        --       --       --       --       --       --       --       --       --       --
              AUG
                09...       5.5       6       180      66       370      9.6       .4      200       .24     737
                22...        --       --       --       --       --       --       --       --       --       --


                          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
                07...        --       --       --       --       --       --       --       --       --       --
              NOV
                17...        --       --       --       --       --       --       --       --       --       --
              DEC
                07...        --       --       --       --       --       --       --       --       --       --
              JAN
                13...        --       --       --       --       --       --       --       --       --       --
              FEB
                15...        --       --       --       --       --       --       --       --       --       --
                29...        --       --       --       --       --       --       --       --       --       --
              MAR
                15...       778      1.0      340       1      20.0      50       <.1      <1      <1.0      380
                29...        --       --       --       --       --       --       --       --       --       --
              APR
                25...        --       --       --       --       --       --       --       --       --       --
              JUN
                21...        --       --       --       --       --       --       --       --       --       --
              AUG
                09...       678      2.0       70       1      30.0      40       <.1      <1      <1.0      400
                22...        --       --       --       --       --       --       --       --       --       --

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