CANNONBALL RIVER BASIN

                                            06350000  CANNONBALL RIVER AT REGENT, ND

LOCATION.--Lat 4625'36", long 10233'05", in NE1/4NE1/4 sec.13, T.134 N., R.95 W., Hettinger County, Hydrologic Unit 10130204,
   on right bank 400 ft from bridge on county highway, and 0.3 mi north of Regent.

DRAINAGE AREA.--580 mi2, approximately.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--September 1950 to current year.

GAGE.--Water-stage recorder. Datum of gage is 2,422.90 ft above sea level.

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

EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage known since 1914, 26.1 ft, Apr. 16, 1950, from floodmarks, discharge,
   20,300 ft3/s, on basis of slope-area measurement at site 4 mi downstream.

                          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       4.0      4.5      6.6     e6.6     e5.0     e9.0      9.2      7.4      6.0      3.7      4.1      1.7
          2       3.9      4.4      6.6     e6.5     e5.2    e10        9.1      7.4      5.9      3.8      3.9      2.1
          3       3.8      4.4      6.6     e6.1     e5.8    e11        9.2      7.3      6.1      4.0      3.7      2.4
          4       3.8      4.7      6.5     e5.8     e6.0    e12        9.5      7.2      6.6      4.0      3.6      2.8
          5       3.9      4.8      6.4     e5.5     e6.1    e13        8.2      7.3      6.4      3.9      3.6      2.7

          6       3.8      5.1      6.3     e5.5     e6.1     14        7.7      7.0      6.9      4.4      3.5      2.6
          7       3.8      5.6     e6.3     e5.5     e6.0     15        7.5      7.5      8.0      4.7      3.2      2.7
          8       3.8      5.6     e6.2     e5.7     e6.2     15        7.5      9.0      7.9     11        3.1      2.9
          9       3.8      5.5     e6.2     e5.9     e6.5     13        7.8      9.1      7.3     61        3.1      2.7
         10       3.9      5.3     e6.1     e6.0     e6.6     16        8.4     10        6.7     70        3.0      2.5

         11       3.8      5.3     e5.9     e5.9     e6.5     15        8.1     11        5.7     58        3.0      2.3
         12       3.8      5.3     e5.9     e5.9     e6.3     17        7.6     11        5.1     50        3.5      2.3
         13       3.9      5.3     e5.8     e5.8     e6.3     15        7.5     10        5.1     39        3.4      2.2
         14       3.9      5.3     e5.8     e5.5     e6.3     14        7.5     10        5.4     30        3.2     e2.2
         15       4.0      5.3     e5.7     e5.2     e6.2     14        7.4      9.8      5.3     26        2.8     e2.1

         16       4.1      5.4     e5.6     e5.0     e6.2     13        7.4      9.2      5.2     21        2.5      2.2
         17       3.9      5.4     e5.6     e5.0     e6.2     13        7.6      8.7      5.2     17        2.2      2.2
         18       4.2      5.5     e5.6     e5.0     e6.1     12        7.7      7.7      5.4     17        2.1      2.1
         19       4.4      5.7     e5.4     e5.0     e6.2     12        7.7      7.1      5.4     15        2.2      2.2
         20       4.5      5.9     e5.0     e5.0     e6.2     12        7.7      6.9      5.3     13        2.2      2.4

         21       4.6      6.0     e4.4     e5.0     e6.2     12        7.6      7.0      5.1     13        2.1      2.8
         22       4.6      6.1     e4.0     e5.0     e6.5     11        7.5      7.2      4.9     12        1.8      3.6
         23       4.2      6.1     e4.0     e5.0     e6.8     11        7.5      7.1      5.2     11        1.7      3.5
         24       4.1      6.1     e4.5     e5.0     e7.0     11        7.5      6.6      5.2      9.1      1.8      3.5
         25       4.2      6.1     e5.0     e4.9     e7.5     11        7.8      6.0      5.1      7.5      1.8      3.6

         26       4.3      6.1     e5.5     e4.9     e8.0     11        7.7      5.7      4.8      6.6      1.7      3.5
         27       4.3      6.3     e6.0     e5.0     e8.0     10        7.8      6.0      4.6      6.1      1.8      3.4
         28       4.1      6.3     e6.0     e5.0     e8.5      9.7      8.0      5.8      4.4      5.6      1.7      3.3
         29       4.2      6.4     e6.2     e5.0     e9.0      9.5      7.9      5.9      4.1      5.2      1.6      3.3
         30       4.2      6.5     e6.4     e5.0      ---      9.2      7.7      5.9      3.9      4.8      1.5      3.5
         31       4.4      ---     e6.6     e5.0      ---      9.4      ---      5.8      ---      4.4      1.6      ---

        TOTAL   126.2    166.3    178.7    167.2    189.5    379.8    237.3    239.6    168.2    541.8     81.0     81.3
        MEAN     4.07     5.54     5.76     5.39     6.53     12.3     7.91     7.73     5.61     17.5     2.61     2.71
        MAX       4.6      6.5      6.6      6.6      9.0       17      9.5       11      8.0       70      4.1      3.6
        MIN       3.8      4.4      4.0      4.9      5.0      9.0      7.4      5.7      3.9      3.7      1.5      1.7
        AC-FT     250      330      354      332      376      753      471      475      334     1070      161      161

        STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2000, BY WATER YEAR (WY)

        MEAN     8.99     5.99     4.21     5.02     23.7      139      119     64.0     80.3     26.4     17.6     5.09
        MAX       124     51.6     15.7     63.2      393      963     1128      523      512      331      299     20.5
        (WY)     1983     1983     1983     1973     1982     1978     1952     1972     1957     1969     1981     1986
        MIN      1.25     1.87      .52     .000     .000     3.23     3.80     2.94     1.57      .78      .67      .70
        (WY)     1961     1961     1951     1952     1959     1964     1961     1992     1990     1989     1959     1960

        SUMMARY STATISTICS           FOR 1999 CALENDAR YEAR        FOR 2000 WATER YEAR           WATER YEARS 1951 - 2000
        ANNUAL TOTAL                       14140.4                     2556.9
        ANNUAL MEAN                           38.7                        6.99                      41.6
        HIGHEST ANNUAL MEAN                                                                        168              1982
        LOWEST ANNUAL MEAN                                                                           3.11           1992
        HIGHEST DAILY MEAN                  1300     Feb 28              70     Jul 10            7880       Mar 27 1978
        LOWEST DAILY MEAN                      3.4   Jul 31               1.5   Aug 30                .00    Dec  5 1950
        ANNUAL SEVEN-DAY MINIMUM               3.6   Jul 29               1.7   Aug 26                .00    Dec  5 1950
        INSTANTANEOUS PEAK FLOW                                          76     Jul  9           10000       Mar 27 1978
        INSTANTANEOUS PEAK STAGE                                          5.80  Jul  9            a 21.01    Mar 21 1997
        ANNUAL RUNOFF (AC-FT)              28050                       5070                      30160
        10 PERCENT EXCEEDS                    81                         11                         45
        50 PERCENT EXCEEDS                     7.2                        5.8                        5.2
        90 PERCENT EXCEEDS                     4.0                        2.8                        1.5

        a  Backwater from ice
        e  Estimated
        
        
                                                     WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water years 1964-66, 1971 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
           08...       1130     3.9       --       --       --     2120     17.5     10.1       --       --       --
         NOV
           16...       1450     5.4       --       --       --     2000     12.0      5.0       --       --       --
         JAN
           13...       1400     5.9       --       --       --     3090     -2.5       .3       --       --       --
         FEB
           16...       1330     6.2       --       --       --     2890     -2.0       .2       --       --       --
         MAR
           16...       0955    13         --       --       --     2780      2.5      1.6       --       --       --
           27...       1440    10        8.2      8.3     2820     2810     14.0      8.0      750      120      110
         APR
           26...       1550     7.8       --       --       --     2630     14.5     14.2       --       --       --
         JUN
           22...       1440     5.0       --       --       --     2800     32.0     21.0       --       --       --
         JUL
           13...       1220    40         --       --       --     2180     32.0     26.5       --       --       --
         AUG
           09...       1240     3.0      8.1      8.4     3030     2980     31.5     23.5      660      100      100
           24...       0945     1.8       --       --       --     2940     28.0     20.0       --       --       --


                                                                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
                08...        --       --       --       --       --       --       --       --       --       --
              NOV
                16...        --       --       --       --       --       --       --       --       --       --
              JAN
                13...        --       --       --       --       --       --       --       --       --       --
              FEB
                16...        --       --       --       --       --       --       --       --       --       --
              MAR
                16...        --       --       --       --       --       --       --       --       --       --
                27...       9.6       7       440      56       378     15.0       .4     1300     61.7     2220
              APR
                26...        --       --       --       --       --       --       --       --       --       --
              JUN
                22...        --       --       --       --       --       --       --       --       --       --
              JUL
                13...        --       --       --       --       --       --       --       --       --       --
              AUG
                09...      12.0       8       470      60       383     16.0       .4     1300     19.5     2370
                24...        --       --       --       --       --       --       --       --       --       --


                          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
                08...        --       --       --       --       --       --       --       --       --       --
              NOV
                16...        --       --       --       --       --       --       --       --       --       --
              JAN
                13...        --       --       --       --       --       --       --       --       --       --
              FEB
                16...        --       --       --       --       --       --       --       --       --       --
              MAR
                16...        --       --       --       --       --       --       --       --       --       --
                27...      2220     <1.0      110      <1      50.0      30       <.1      <1      <1.0     1700
              APR
                26...        --       --       --       --       --       --       --       --       --       --
              JUN
                22...        --       --       --       --       --       --       --       --       --       --
              JUL
                13...        --       --       --       --       --       --       --       --       --       --
              AUG
                09...      2230     <1.0       60      <1      60.0      60       <.1      <1      <1.0     1500
                24...        --       --       --       --       --       --       --       --       --       --

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