RED RIVER OF THE NORTH BASIN

                                               05101000  TONGUE RIVER AT AKRA, ND

LOCATION.--Lat 4846'42", long 9744'43", in SW1/4 sec.10, T.161 N., R.55 W., Pembina County, Hydrologic Unit 09020313, on left
   bank 300 ft downstream from Renwick Dam, 0.9 mi northwest of Akra, and 6 mi west of Cavalier.

DRAINAGE AREA.--160 mi2.


                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--April to June 1950 (WSP 1137-B), October 1951 to current year (seasonal record since 1983).

REVISED RECORDS.--WSP 1728: Drainage area.

GAGE.--Water-stage recorder. Datum of gage is 930.00 ft above sea level. Prior to July 10, 1954, nonrecording gage 1.2 mi
   downstream at datum 30.00 ft lower. July 23, 1954, to Dec. 19, 1973, water stage recorder 2.7 mi downstream at datum 9.10 ft
   lower.

REMARKS.--Records good except for estimated daily discharges, which are poor. Flow regulated by temporary retention in ten
   retarding basins beginning 300 ft above station, four of which have slow release outlet structures to regulate the flow.
   Retarding basins were completed during the period l955 to l961 and have a combined capacity of l9,245 acre-ft.

EXTREMES FOR CURRENT YEAR.--Maximum instantaneous discharge, 40 ft3/s, June 16, gage height, 8.90 ft; minimum observed daily
   discharge, 0.60 ft3/s, Aug. 3.

                          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       ---      ---      ---      ---      ---      8.0     11       11        6.2      5.4     1.2      11
          2       ---      ---      ---      ---      ---      7.4     11       10        5.9      4.1      .84      8.4
          3       ---      ---      ---      ---      ---      7.5     10       11        5.5      3.4      .60      6.8
          4       ---      ---      ---      ---      ---      7.7      9.8     11        5.5      3.0      .69      5.8
          5       ---      ---      ---      ---      ---      8.4      9.6     10        5.9      2.9      .78      5.4

          6       ---      ---      ---      ---      ---      9.0      9.3      9.8      6.4      2.7      .85      5.2
          7       ---      ---      ---      ---      ---      9.6      8.8     e9.8      6.1      3.1      .93      4.9
          8       ---      ---      ---      ---      ---      9.7      7.6     e9.9      5.5      3.6     1.1       4.2
          9       ---      ---      ---      ---      ---      7.9      7.7     e9.8      5.0      3.9     1.6       4.0
         10       ---      ---      ---      ---      ---      7.3      7.5     e9.8      3.5      4.2     1.9       3.4

         11       ---      ---      ---      ---      ---      7.1      7.4    e10        2.6      4.8     2.9       3.0
         12       ---      ---      ---      ---      ---      7.0      7.3    e11        3.2      5.2     4.0       2.7
         13       ---      ---      ---      ---      ---      6.9      7.3    e12        4.9      4.9     4.4       2.4
         14       ---      ---      ---      ---      ---      6.8      7.2    e14       14        4.5     4.2       2.2
         15       ---      ---      ---      ---      ---      6.6      7.2    e14       29        3.6     4.5       2.0

         16       ---      ---      ---      ---      ---      6.5      7.6    e14       38        3.2     4.6       1.9
         17       ---      ---      ---      ---      ---      6.3      7.5     13       39        2.6     4.8       1.8
         18       ---      ---      ---      ---      ---      6.4      7.7     12       33        2.3     5.1       1.8
         19       ---      ---      ---      ---      ---      6.5      7.5     10       26        2.1     5.3       1.8
         20       ---      ---      ---      ---      ---      6.7      7.5      9.5     23        1.8     5.7       1.8

         21       ---      ---      ---      ---      ---      6.8      7.4      8.1     21        1.6     5.7       1.8
         22       ---      ---      ---      ---      ---      6.9      7.3      8.0     19        1.5     6.2       1.8
         23       ---      ---      ---      ---      ---      7.3      8.4      8.4     19        1.3     6.8       1.7
         24       ---      ---      ---      ---      ---      9.4      8.3      7.7     17        1.3     6.8       1.8
         25       ---      ---      ---      ---      ---     13        7.8      7.6     15        1.1     6.6       1.8

         26       ---      ---      ---      ---      ---     14        7.7      7.6     12        1.2     5.6       1.8
         27       ---      ---      ---      ---      ---     15        8.0      7.1      9.9      1.2     4.7       1.7
         28       ---      ---      ---      ---      ---     14        8.3      6.9      9.1      1.2     6.4       1.6
         29       ---      ---      ---      ---      ---     13        9.5      6.7      7.7     e1.2     8.5       1.6
         30       ---      ---      ---      ---      ---     12       11        6.7      6.6     e1.2    11         1.6
         31       ---      ---      ---      ---      ---     12        ---      6.3      ---      1.2    13         ---

       TOTAL     ---      ---      ---      ---      ---    272.7    250.2    302.7    404.5     85.3   137.29     97.7
        MEAN      ---      ---      ---      ---      ---     8.80     8.34     9.76     13.5     2.75     4.43     3.26
        MAX       ---      ---      ---      ---      ---       15       11       14       39      5.4       13       11
        MIN       ---      ---      ---      ---      ---      6.3      7.2      6.3      2.6      1.1      .60      1.6
        AC-FT     ---      ---      ---      ---      ---      541      496      600      802      169      272      194

        STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1950 - 2000, BY WATER YEAR (WY)

        MEAN     6.29     6.76     4.46     3.16     3.60     24.2      120     63.6     18.9     15.5     7.51     6.40
        MAX      30.1     22.7     12.9     7.27     18.7      135      451      587     78.7      216      144     28.3
        (WY)     1981     1981     1971     1971     1981     1966     1950     1950     1964     1997     1993     1980
        MIN       .51      .56     .065      .51      .24      .22      .43     1.63      .47     .086      .21     .096
        (WY)     1962     1976     1953     1953     1953     1964     1991     1980     1988     1978     1988     1989

        SUMMARY STATISTICS                  WATER YEARS 1950 - 2000

        ANNUAL MEAN                          a 21.4
        HIGHEST ANNUAL MEAN                  a 50.1            1956
        LOWEST ANNUAL MEAN                    a 3.11           1961
        HIGHEST DAILY MEAN                   5240       Apr 18 1950
        LOWEST DAILY MEAN                        .00    Dec  1 1952
        ANNUAL SEVEN-DAY MINIMUM                 .00    Dec  1 1952
        INSTANTANEOUS PEAK FLOW           b 11800       Apr 18 1950
        INSTANTANEOUS PEAK STAGE             c 48.70    Apr 18 1950
        ANNUAL RUNOFF (AC-FT)             a 15480
        10 PERCENT EXCEEDS                     51
        50 PERCENT EXCEEDS                      5.0
        90 PERCENT EXCEEDS                       .80

        a  Based on complete water years only (1952-82)
        b  From indirect measurement of flow
        c  From flood marks, site and datum then in use
        e  Estimated
        
        
                                                     WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water year 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
           05...       0925    10         --       --       --      630      4.5      8.5       --       --       --
         FEB
           29...       1540     8.6       --       --       --      670      4.0      4.0       --       --       --
         MAR
           22...       0935     6.8       --       --       --      611     11.5      5.5       --       --       --
         APR
           27...       1230     7.5      8.4       --      584      560     18.0     12.0      270     74.0     21.0
         MAY
           17...       1635    13         --       --       --      598     19.0     13.5       --       --       --
         AUG
           03...       1115      .57      --       --       --      596     27.5     23.5       --       --       --
           28...       1635     7.5      8.2      7.9      565      526     23.0     22.0      230     56.0     22.0


                                                                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
                05...        --       --       --       --       --       --       --       --       --       --
              FEB
                29...        --       --       --       --       --       --       --       --       --       --
              MAR
                22...        --       --       --       --       --       --       --       --       --       --
              APR
                27...       4.0       .6     22.0      15       237     10.0       .2     71.0      7.56     373
              MAY
                17...        --       --       --       --       --       --       --       --       --       --
              AUG
                03...        --       --       --       --       --       --       --       --       --       --
                28...       4.7       .7     25.0      19       200     10.0       .3     74.0      7.10     352


                          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
                05...        --       --       --       --       --       --       --       --       --       --
              FEB
                29...        --       --       --       --       --       --       --       --       --       --
              MAR
                22...        --       --       --       --       --       --       --       --       --       --
              APR
                27...       345      2.0      20        1      30.0      330      <.1       1      <1.0      380
              MAY
                17...        --       --       --       --       --       --       --       --       --       --
              AUG
                03...        --       --       --       --       --       --       --       --       --       --
                28...       312      9.0      80        1      40.0      120      <.1       3       1.0      270

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