RED RIVER OF THE NORTH BASIN

                                            05059700  MAPLE RIVER NEAR ENDERLIN, ND

LOCATION.--Lat 4637'18", long 9734'25", on west line sec.2, T.136 N., R.55 W., Ransom County, Hydrologic Unit 09020205, on
   left bank 25 ft downstream from county highway bridge, 1 mi downstream from South Branch, and 1.2 mi east of Enderlin.

DRAINAGE AREA.--843 mi2, of which about 47 mi2 is probably noncontributing.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--May 1956 to current year.

REVISED RECORDS.--WSP 1728: Drainage area.

GAGE.--Water-stage recorder. Datum of gage is 1,056.72 ft above sea level. Sept. 21, 1956, to June 9, 1969, recording gage on
   right bank at same datum. Prior to Sept. 20, 1956, nonrecording gage at site 25 ft upstream at same datum.

REMARKS.--Records good except for period of estimated daily 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        26       27    e16       e7.0     e5.6      188      140       45     15        196     11        4.4
          2        26       26    e15       e6.8     e5.7      270      129       43     13        169      9.3     14
          3        25       25    e14       e6.7     e5.8      421      112       43     14        147      8.6     14
          4        23       24    e12       e6.5     e5.8      483      102       40     18        127      8.3     14
          5        26       23    e11       e6.4     e5.8      334       95       37     18        393      7.9     17

          6        29       24    e10       e6.4     e6.0      256       81       34     17        213      6.6     13
          7        26       24     e9.4     e6.2     e6.0      193       74       36     15        182      5.7     15
          8        24       27     e9.2     e6.2     e6.0      177       70       42     13        151      5.3     13
          9        22       24     e9.0     e6.2     e6.0       81       66       39     12        152      5.1     11
         10        28       24     e8.9     e6.2     e6.0       94       62       38     11        141      5.2      8.7

         11        32       24     e8.8     e6.2     e6.0      105       59       38      9.6      117      4.9      7.5
         12        33       23     e8.7     e6.2     e6.1       78       58       35      8.0       98      4.7      6.6
         13        34       24     e8.6     e6.2     e6.1       70       59       33      7.1       82      4.5      5.8
         14        35       22     e8.5     e6.1     e6.1       62       60       30      8.4       69      4.1      5.8
         15        39       21     e8.4     e6.2     e6.3       49       39       28      8.7       58      3.7      5.9

         16        38       24     e8.2     e6.0     e6.3       44       57       29     22         49      3.8      5.9
         17        40       27     e8.0     e5.8     e6.6       41       53       29     23         41      3.9      6.0
         18        40       21     e7.8     e5.8     e6.8       42       53       27     58         36      3.8      5.7
         19        38       20     e7.6     e5.8     e7.0       51       56       25     79         33      3.6      5.1
         20        41       19     e7.5     e5.7     e7.6       68       63       25    312         31      3.7      5.1

         21        41       19     e7.5     e5.6     e7.8       74       63       29    359         27      3.6      5.2
         22        41       19     e7.4     e5.6     e8.0      111       65       26    471         24      3.8      7.6
         23        39       18     e7.4     e5.6     e8.8      167       64       23    700         21      3.7      8.4
         24        37       19     e7.4     e5.6     e9.8      193       62       19    757         20      3.5      9.0
         25        35       19     e7.4     e5.6    e11        219       63       16    625         19      3.6      8.5

         26        33       19     e7.4     e5.6    e40        235       64       15    532         18      3.5      7.9
         27        34       18     e7.4     e5.6    e54        227       63       15    435         17      3.2      7.3
         28        32       19     e7.4     e5.6    e70        215       54       15    348         16      3.3      6.7
         29        31       19     e7.4     e5.6    e95        197       51       14    276         14      3.4      5.9
         30        31       17     e7.2     e5.6      ---      182       48       18    227         12      3.9      5.8
         31        30      ---     e7.0     e5.6      ---      158      ---       16      ---       12      7.5      ---

        TOTAL    1009      659    277.5    186.2    428.0     5085     2085      902   5411.8     2685    156.7    255.8
        MEAN     32.5     22.0     8.95     6.01     14.8      164     69.5     29.1      180     86.6     5.05     8.53
        MAX        41       27       16      7.0       95      483      140       45      757      393       11       17
        MIN        22       17      7.0      5.6      5.6       41       39       14      7.1       12      3.2      4.4
        AC-FT    2000     1310      550      369      849    10090     4140     1790    10730     5330      311      507

        STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1956 - 2000, BY WATER YEAR (WY)

        MEAN     10.8     6.79     4.68     2.71     6.10      149      282     70.2     46.0     66.2     21.9     13.1
        MAX       211     63.6     50.4     7.78      123      622     2162      669      424      875      506      122
        (WY)     1995     1995     1999     1999     1998     1966     1997     1999     1975     1993     1993     1999
        MIN      1.52     1.49     1.32     1.21     1.30     2.10     2.06     2.19     1.41     1.44     1.33     1.28
        (WY)     1993     1961     1961     1969     1969     1969     1991     1992     1961     1961     1961     1984

        SUMMARY STATISTICS           FOR 1999 CALENDAR YEAR        FOR 2000 WATER YEAR           WATER YEARS 1956 - 2000

        ANNUAL TOTAL                       66208.7                    19141.0
        ANNUAL MEAN                          181                         52.3                       56.9
        HIGHEST ANNUAL MEAN                                                                        242              1997
        LOWEST ANNUAL MEAN                                                                           2.14           1990
        HIGHEST DAILY MEAN                  2320     May 13             757     Jun 24            5450       Jun 30 1975
        LOWEST DAILY MEAN                      6.4   Jan 29               3.2   Aug 27                .10    Dec  7 1963
        ANNUAL SEVEN-DAY MINIMUM               6.6   Jan 28               3.5   Aug 23                .67    Dec  7 1963
        INSTANTANEOUS PEAK FLOW                                         840     Jun 23            7610       Jun 30 1975
        INSTANTANEOUS PEAK STAGE                                          7.66  Jun 23              15.41    Jun 30 1975
        ANNUAL RUNOFF (AC-FT)             131300                      37970                      41240
        10 PERCENT EXCEEDS                   659                        143                         87
        50 PERCENT EXCEEDS                    25                         19                          3.8
        90 PERCENT EXCEEDS                     7.3                        5.6                        1.8
        
        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
           15...       0925     40        --       --       --     1360      7.0      9.5       --       --       --
         DEC
           10...       1340      8.9      --       --       --     1950      -.5      2.0       --       --       --
         JAN
           14...       1030      6.1      --       --       --     2170     -9.0      1.0       --       --       --
         MAR
           03...       1030    397       7.9       --     1750     1790      2.5       .5      670      140     77.0
           23...       1450    168        --       --       --       --      8.5      3.5       --       --       --
         APR
           24...       1720     61        --       --       --     2160     14.5     17.0       --       --       --
         JUN
           23...       1105    674        --       --       --     1060     25.5     21.0       --       --       --
         AUG
           09...       1240      4.9     7.8      7.9       --     1540     29.0     22.0      770      180     77.0


                                                                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
                15...        --       --       --       --       --       --       --       --       --       --
              DEC
                10...        --       --       --       --       --       --       --       --       --       --
              JAN
                14...        --       --       --       --       --       --       --       --       --       --
              MAR
                03...      24.0       2       110      26       132     69.0       .2      620    1440      1340
                23...        --       --       --       --       --       --       --       --       --       --
              APR
                24...        --       --       --       --       --       --       --       --       --       --
              JUN
                23...        --       --       --       --       --       --       --       --       --       --
              AUG
                09...      13.0       2       110      23       390     53.0       .2      520      14.8    1110


                          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
                15...        --       --       --       --       --       --       --       --       --       --
              DEC
                10...        --       --       --       --       --       --       --       --       --       --
              JAN
                14...        --       --       --       --       --       --       --       --       --       --
              MAR
                03...      1120      5.0      30       <1       80.0      10      <.1       1       1.0      670
                23...        --       --       --       --       --       --       --       --       --       --
              APR
                24...        --       --       --       --       --       --       --       --       --       --
              JUN
                23...        --       --       --       --       --       --       --       --       --       --
              AUG
                09...      1190      7.0      80       <1      130      1200      <.1       3      <1.0      710

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