SQUARE BUTTE CREEK BASIN

                                         06342260  SQUARE BUTTE CREEK BELOW CENTER, ND

LOCATION.--Lat 47o03'25", long 101o11'35", in SE1/4 sec.4, T.141 N., R.83 W., Oliver County, Hydrologic Unit 10130101, on right
   bank at southeast corner of farmyard and 6 mi southeast of Center.

DRAINAGE AREA.--146 mi2.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--May 1965 to current year.

GAGE.--Water-stage recorder. Elevation of gage is 1,865 ft above sea level, from topographic map.

REMARKS.--Records good except for periods of estimated discharge, which are fair. Flow regulated by Nelson Lake 1.5 mi upstream
   beginning Aug. 24, 1967, capacity 5,000 acre-ft. The capacity of Nelson Lake was increased to 10,000 acre-ft in Aug. 1975.

                           DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
                                                        DAILY MEAN VALUES

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

           1       .74      1.2     e1.2     e1.5     e1.4   e15        31       1.0      7.0       1.5      1.6     2.1
           2       .75      1.0     e1.3     e1.5     e1.4   e14        32       1.0      7.4       1.5      1.7     2.2
           3       .71      1.0     e1.3     e1.5     e1.4   e13.0      32       1.1      7.3       2.0      1.7     2.1
           4      1.2       1.2     e1.2     e1.5     e1.4    11        31       1.5      7.5       1.8      1.8     2.3
           5      3.0       1.4     e1.2     e1.5     e1.4    10        31       2.6      7.3       1.9      2.0     2.0

           6      1.3       1.4     e1.2     e1.5     e1.4     9.4      32      65       14         1.7      2.2     1.7
           7      1.0       1.4     e1.2     e1.5     e1.5     9.3      32     221      180         1.7      2.5     1.6
           8      1.1       1.4     e1.2     e1.5     e1.5     9.3      32     208       92         1.7      2.3     1.5
           9      1.1       1.7     e1.2     e1.5     e1.5     9.4      32      44       97         1.6      2.3     1.4
          10       .95      1.7     e1.2     e1.5     e1.6    11        17       3.6     28         1.6      2.2     1.4

          11      1.6       1.7     e1.3     e1.5     e1.7    12         2.5     3.0     12         1.6      2.3     1.5
          12      1.1       1.7     e1.3     e1.5     e1.6      .90      2.0     2.0      3.0       1.6      4.8     1.5
          13      1.2       1.4     e1.4     e1.5     e1.6      .62      2.0     1.5      1.6       1.6      2.8     1.4
          14      1.2       1.3     e1.6     e1.5     e1.6    14         1.9    50        1.6       1.6      2.3     1.1
          15      1.1       1.2     e1.4     e1.5     e1.5   415         1.7   227         .91      1.8      2.5     1.0

          16      1.8       1.2     e1.5     e1.6     e1.5   641         6.2   116        1.0       1.7      2.5      .95
          17      1.2       1.1     e1.5     e1.5     e1.5   353        30      67         .91      1.6      2.3      .88
          18      1.3       1.0     e1.5     e1.5     e1.5   145        30      67         .98      2.0      2.4      .80
          19      1.2       1.2     e1.5     e1.5     e1.5   107        30     111        1.0       1.9      2.4      .76
          20      1.2       1.2     e1.5     e1.5     e1.6   147        30      40         .99      1.7      2.4      .73

          21      1.5       1.1     e1.5     e1.5     e1.7    86        30       1.6      2.0       1.7      2.4      .72
          22      1.4       1.4     e1.5     e1.4     e1.9    46        30       1.0      1.4       1.6      2.3      .68
          23      1.3      e1.3     e1.5     e1.4     e2.5    47         8.0      .87     1.3       1.6      2.4      .62
          24      1.3      e1.3     e1.5     e1.4     e3.0    46         1.7      .70     1.3       1.5      2.4      .61
          25      1.4      e1.3     e1.5     e1.4     e3.8    33         1.3      .69     1.3       1.7      2.4      .66

          26      1.2      e1.3     e1.5     e1.4     e5.4     2.4       1.4      .67     1.3       1.5      2.3      .66
          27      1.2      e1.2     e1.5     e1.4     e7.6     1.8       1.5     1.3      1.3       1.5      2.2      .82
          28      1.3      e1.2     e1.5     e1.4    e10       1.6       1.4     6.0      1.7       1.5      2.4      .56
          29      1.4      e1.3     e1.5     e1.4      ---     1.5       1.3     6.5      1.4       1.5      2.6      .67
          30      1.3      e1.2     e1.5     e1.4      ---    15         1.2     6.6      1.5       1.5      2.6      .59
          31      1.4       ---     e1.5     e1.4      ---    31         ---     6.8       ---      1.5      2.4      ---

         TOTAL   39.45     39.0     43.2     45.6     66.0  2258.22    516.1  1266.03   485.99     51.2     73.4    35.51
         MEAN     1.27     1.30     1.39     1.47     2.36     72.8     17.2     40.8     16.2     1.65     2.37     1.18
         MAX       3.0      1.7      1.6      1.6       10      641       32      227      180      2.0      4.8      2.3
         MIN       .71      1.0      1.2      1.4      1.4      .62      1.2      .67      .91      1.5      1.6      .56
         AC-FT      78       77       86       90      131     4480     1020     2510      964      102      146       70

         STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1965 - 1999, BY WATER YEAR (WY)

         MEAN     1.52     1.41     1.38     1.34     7.35     55.7     37.9     9.76     5.77     10.6     3.08     1.60
         MAX      2.98     2.99     3.35     2.04      109      216      223     47.8     65.0      175     34.5     3.64
         (WY)     1981     1983     1978     1983     1996     1987     1969     1995     1966     1993     1993     1980
         MIN       .24      .19      .21      .20     .089     1.24     1.00      .79      .57      .71      .83      .35
         (WY)     1968     1968     1968     1968     1966     1998     1998     1989     1989     1989     1982     1967

         SUMMARY STATISTICS           FOR 1998 CALENDAR YEAR        FOR 1999 WATER YEAR           WATER YEARS 1965 - 1999

         ANNUAL TOTAL                         451.55                    4919.70
         ANNUAL MEAN                            1.24                      13.5                       11.5
         HIGHEST ANNUAL MEAN                                                                         30.0            1969
         LOWEST ANNUAL MEAN                                                                            .86           1968
         HIGHEST DAILY MEAN                     3.4   Aug  2             641     Mar 16            2670       Jul 18 1969
         LOWEST DAILY MEAN                       .64  Aug 30                .56  Sep 28                .00    Feb 14 1966
         ANNUAL SEVEN-DAY MINIMUM                .72  Aug 26                .65  Sep 24                .00    Feb 14 1966
         INSTANTANEOUS PEAK FLOW                                        1100     Mar 16            9700       Jun 24 1966
         INSTANTANEOUS PEAK STAGE                                          7.72  Mar 16              14.35    Jun 24 1966
         INSTANTANEOUS LOW FLOW                                                                        .00    Feb 14 1966
         ANNUAL RUNOFF (AC-FT)                896                       9760                       8330
         10 PERCENT EXCEEDS                     1.7                       30                          7.0
         50 PERCENT EXCEEDS                     1.2                        1.5                        1.5
         90 PERCENT EXCEEDS                      .82                       1.0                         .90

         e  Estimated

                                                     WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water year 1972 to current year.

REMARKS.--Quality assurance sample also collected at this location.

                                 WATER-QUALITY DATA, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999

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

               NOV
                 23...       1445     1.3       --       --     1010      3.3      3.2       --       --       --
               MAR
                 03...       1105    13        7.5     1610     1380      1.5      5.2      370      62       52
               APR
                 13...       1100     2.1       --       --     1160     19.0     11.7       --       --       --
               MAY
                 28...       1020     6.5       --       --     1130     18.0     17.6       --       --       --
               JUL
                 08...       1545     1.8       --       --     1250     26.0     24.6       --       --       --
               AUG
                 31...       1200     2.4      7.9     1360     1260       --     23.0      340      73       37


                                                                 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    SODIUM   (MG/L     AS      (MG/L    (MG/L    (MG/L     PER     SOLVED
                            AS K)            PERCENT   AS NA)   CACO3)   AS CL)   AS F)   AS SO4)    DAY)    (MG/L)
                           (00935)  (00931)  (00932)  (00930)  (90410)  (00940)  (00950)  (00945)  (70302)  (70300)

               NOV
                 23...        --       --       --       --       --       --       --       --       --       --
               MAR
                 03...      16         5       56       230      340      18        .40     550     39.5     1130
               APR
                 13...        --       --       --       --       --       --       --       --       --       --
               MAY
                 28...        --       --       --       --       --       --       --       --       --       --
               JUL
                 08...        --       --       --       --       --       --       --       --       --       --
               AUG
                 31...       8.6       5       54       190      428      12        .40     340      5.79     886


                           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)

               NOV
                 23...        --       --       --       --       --       --       --       --       --       --
               MAR
                 03...      1130       2       40      <1.0      60       80       <.1      5.0       1       930
               APR
                 13...        --       --       --       --       --       --       --       --       --       --
               MAY
                 28...        --       --       --       --       --       --       --       --       --       --
               JUL
                 08...        --       --       --       --       --       --       --       --       --       --
               AUG
                 31...       919       1       20      <1.0      50       50        .4      2.0      <1       930

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