HEART RIVER BASIN

                                     06348300  HEART RIVER AT STARK BRIDGE NEAR JUDSON, ND

LOCATION.--Lat 4642'11", long 10112'37", in SE1/4SW1/4SW1/4 sec.6, T.137 N., R.83 W., Morton County, Hydrologic Unit 10130203,
   on right bank 50 ft upstream from county bridge, and 9.5 mi southeast of Judson.

DRAINAGE AREA.--2,930 mi2, approximately.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--March 1986 to September 1988 (annual maximum discharges only), October 1988 to current year.

GAGE.--Water-stage recorder. Elevation of gage is 1,720 ft above sea level, from topographic map.

REMARKS.--Records good except for periods of estimated discharge, which are poor. Flow regulated by Lake Tschida (06346000)
   since 1949.

                          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        63       67      e64      e54      e50     e200       61       66       33       52       70       49
          2        64       61      e64      e53      e50     e300       60       60       45       48       66       57
          3        64       61      e64      e53      e49     e450       60       57       81       45       70       57
          4        65       61      e64      e52      e49     e600       59       54       62       42       66       53
          5        65       60      e64      e52      e49     e500       62       51       61       41       68       44

          6        64       59      e64      e51      e49     e350       58       50       59       43       83       50
          7        65       62      e64      e51      e49     e290       55       48       57       42       82       61
          8        65       62      e64      e50      e49     e280       55       54       56       83       87       62
          9        65       63      e63      e50      e49     e210       54       54       55       70       85       64
         10        65       64      e62      e50      e49     e200       54       56       56       69       66       63

         11        64       64      e62      e50      e49     e180       54       58       55       71       58       63
         12        64       65      e62      e50      e49     e150       53       59       55      130       57       62
         13        66       65      e62      e50      e49      132       52       60       86      516       55       65
         14        66       65      e61      e50      e49      112       52       59      292      248       56       65
         15        67       64      e61      e50      e49       98       52       58      337      153       55       57

         16        67       64      e60      e50      e49      157       51       57      239      105       51       47
         17        68       64      e59      e50      e49       92       50       55      192       82       46       45
         18        69       64      e58      e50      e49       93       50       52      184       83       47       46
         19        70       66      e58      e50      e49       91       49       50      161       75       47       48
         20        71       66      e57      e50      e49      106       50       47      145       73       50       47

         21        69       67      e57      e50      e49      109       49       44      133       69       53       51
         22        67       68      e57      e50      e49       98       47       42      125       61       51       62
         23        67       69      e57      e50      e49       92       46       40      104       54       51       61
         24        68       64      e57      e50      e49       94       47       36       96       47       49       62
         25        67       64      e56      e50      e55       89       51       33       91       43       51       57

         26        66      e64      e56      e50      e70       85       54       31       82       40       50       54
         27        66      e64      e56      e50     e100       80       73       33       73       54       47       53
         28        68      e64      e56      e50     e130       73       81       30       68       69       46       49
         29        66      e64      e55      e50     e160       69       85       28       63       63       44       37
         30        66      e64      e54      e50      ---       65       79       28       57       59       44       25
         31        66      ---      e54      e50      ---       63      ---       27      ---       64       51      ---

        TOTAL    2053     1919     1852     1566     1693     5508     1703     1477     3203     2694     1802     1616
        MEAN     66.2     64.0     59.7     50.5     58.4      178     56.8     47.6      107     86.9     58.1     53.9
        MAX        71       69       64       54      160      600       85       66      337      516       87       65
        MIN        63       59       54       50       49       63       46       27       33       40       44       25

        STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1989 - 2000, BY WATER YEAR (WY)

        MEAN     68.5     45.3     31.2     22.8      111      672      399      220      130      236      140     68.3
        MAX       254      131     94.9     59.0      578     3050     2468      800      296     1479      674      192
        (WY)     1995     1999     1999     1996     1995     1997     1997     1995     1994     1993     1998     1995
        MIN      12.3     14.1     7.07      .34     4.19     37.1     15.0     16.3     14.5     28.8     19.7     11.7
        (WY)     1993     1989     1991     1991     1993     1990     1990     1992     1990     1990     1992     1992

        SUMMARY STATISTICS           FOR 1999 CALENDAR YEAR        FOR 2000 WATER YEAR           WATER YEARS 1989 - 2000

        ANNUAL TOTAL                      112547                      27086
        ANNUAL MEAN                          308                         74.0                      179
        HIGHEST ANNUAL MEAN                                                                        569              1997
        LOWEST ANNUAL MEAN                                                                          22.3            1990
        HIGHEST DAILY MEAN                  3500     Mar  2             600     Mar  4           15000       Mar 23 1997
        LOWEST DAILY MEAN                     22     Jan  3              25     Sep 30                .21    Jan  1 1991
        ANNUAL SEVEN-DAY MINIMUM              23     Jan  1              30     May 25                .22    Dec 31 1990
        INSTANTANEOUS PEAK FLOW                                       a 650     Mar  5         a 18000       Mar 23 1997
        INSTANTANEOUS PEAK STAGE                                        b 5.67  Mar 10          b,c 21.90    Mar 23 1997
        10 PERCENT EXCEEDS                   898                         98                        341
        50 PERCENT EXCEEDS                    89                         59                         47
        90 PERCENT EXCEEDS                    34                         47                         11

        a  About
        b  Backwater from ice
        c  Maximum recorded
        e  Estimated
        
        
                                                     WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water year 1988 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
           14...       1440      64       --       --       --     1590     16.5     11.0       --       --       --
         NOV
           08...       1415      66       --       --       --     1590     23.5      8.5       --       --       --
         JAN
           07...       1235      50       --       --       --     1920      9.0       .5       --       --       --
         FEB
           24...       1540      49       --       --       --     2660      5.0       .1       --       --       --
         MAR
           07...       1400     296       --       --       --     1610     18.5      6.8       --       --       --
           31...       1420      64      8.4      8.4     1750     1760     15.0      9.4      440     77.0     59.0
         APR
           21...       1120      48       --       --       --     1120     19.0     10.6       --       --       --
         JUN
           27...       1200      73       --       --       --     2070     21.0     16.0       --       --       --
         AUG
           29...       1400      44      8.5      8.3       --     1110     17.0     21.0      410     63.0     60.0


                                                                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
                14...        --       --       --       --       --       --       --       --       --       --
              NOV
                08...        --       --       --       --       --       --       --       --       --       --
              JAN
                07...        --       --       --       --       --       --       --       --       --       --
              FEB
                24...        --       --       --       --       --       --       --       --       --       --
              MAR
                07...        --       --       --       --       --       --       --       --       --       --
                31...      10.0       5       260      56       417      6.6       .4      590      218     1270
              APR
                21...        --       --       --       --       --       --       --       --       --       --
              JUN
                27...        --       --       --       --       --       --       --       --       --       --
              AUG
                29...      11.0       6       270      58       336     15.0       .3      610      152     1280


                          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
                14...        --       --       --       --       --       --       --       --       --       --
              NOV
                08...        --       --       --       --       --       --       --       --       --       --
              JAN
                07...        --       --       --       --       --       --       --       --       --       --
              FEB
                24...        --       --       --       --       --       --       --       --       --       --
              MAR
                07...        --       --       --       --       --       --       --       --       --       --
                31...      1250      1.0       50      <1      60.0      40       <.1      <1      <1.0      940
              APR
                21...        --       --       --       --       --       --       --       --       --       --
              JUN
                27...        --       --       --       --       --       --       --       --       --       --
              AUG
                29...      1230     <1.0      <10      <1      60.0      10        .1       1       1.0      950

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