RED RIVER OF THE NORTH BASIN

                                            05059700  MAPLE RIVER NEAR ENDERLIN, ND

LOCATION.--Lat 46o37'18", long 97o34'25", 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 periods of estimated daily discharge, which are poor.

                           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       2.8       34       80     11        6.6       24     1490       78       80       12       24       31
           2       2.8       34       78     11        6.6       30     1560       71       73       12       28       49
           3       3.0       37       80     11        6.8       30     1760       67       65       13       34      225
           4       4.3       38       83     11       e7.0       26     1510       69       57       47       33      229
           5       4.8       36       93      9.7      7.1       23     1270      117       57       60       30      238

           6       3.7       34      e94      8.9      7.1       22     1300      115       53       53       30      213
           7       2.9       32      e93      8.5      7.1      e21     1160      163       51       36       27      228
           8       2.7       31      e89      8.0      7.0      e20     1060      228       46       25       22      230
           9       2.8       30       81      7.8      7.0      e19      998      343       44       20       20      216
          10       2.9      e29       71      7.5      7.3      e19      940      758       38       20       19      196

          11       3.9       21       63      7.4     e7.2      e18      868     1180       35       23       18      181
          12       3.0       22       57      7.3     e7.4      e17      775     2220       33       31       26      181
          13       3.2       23       53      7.3      7.6      e17      693     2320       28       41       28      170
          14       3.7       28       51      7.1      7.4      e17      628     1990       24       45       20      164
          15       4.0       27       50      7.0     e7.4      e25      561     1630       22       45       19      151

          16       4.1       25       50      6.9     e7.4      e80      491     1390       18       41       20      136
          17      26         24       48      7.2     e7.4     e320      413     1230       16       38       16      118
          18      34         24       43      7.3     e7.3     e250      357     1100       14       35       15      102
          19      57         22      e42      7.3     e7.2     e300      285      989       14       24       13       87
          20      73         17      e36      7.1     e7.0     e500      242      873       13       23       11       76

          21     115         19      e34      7.1     e7.0     e800      205      751       13       20       11       66
          22     109         21       31      7.1     e7.2    e1200      181      637       14       20       11       58
          23      93         22       27      7.0     e8.0     1390      164      531       16      621       11       51
          24      77         24       23      6.8    e10       1610      149      449       13      166       11       47
          25      63         26       21      6.8     12       1420      134      358       11       85       11       43

          26      51         29       19      6.9     14       1200      125      286       11       66       11       39
          27      44         32       17      7.0    e18       1100      116      233       11       57       10       36
          28      38         37       16      6.7     21       1180      103      187       13       48       12       32
          29      38         56       15      6.4      ---     1460       93      149       13       39       16       30
          30      37         72       13      6.5      ---     1640       86      120       12       35       16       29
          31      35        ---       12      6.5      ---     1580      ---       98      ---       28       15      ---

         TOTAL   944.6      906     1563    241.1    240.1    16358    19717    20730      908     1829      588     3652
         MEAN     30.5     30.2     50.4     7.78     8.57      528      657      669     30.3     59.0     19.0      122
         MAX       115       72       94       11       21     1640     1760     2320       80      621       34      238
         MIN       2.7       17       12      6.4      6.6       17       86       67       11       12       10       29
         AC-FT    1870     1800     3100      478      476    32450    39110    41120     1800     3630     1170     7240

         STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1956 - 1999, BY WATER YEAR (WY)

         MEAN     10.3     6.43     4.58     2.63     5.89      149      287     71.1     42.9     65.8     22.3     13.2
         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 1998 CALENDAR YEAR        FOR 1999 WATER YEAR           WATER YEARS 1956 - 1999

         ANNUAL TOTAL                       36370.0                    67676.8
         ANNUAL MEAN                           99.6                      185                         57.0
         HIGHEST ANNUAL MEAN                                                                        242              1997
         LOWEST ANNUAL MEAN                                                                           2.14           1990
         HIGHEST DAILY MEAN                  1440     Feb 28            2320     May 13            5450       Jun 30 1975
         LOWEST DAILY MEAN                      2.1   Sep  2               2.7   Oct  8                .10    Dec  7 1963
         ANNUAL SEVEN-DAY MINIMUM               2.5   Sep  1               3.1   Oct  7                .67    Dec  7 1963
         INSTANTANEOUS PEAK FLOW                                        2520     May 12            7610       Jun 30 1975
         INSTANTANEOUS PEAK STAGE                                         10.75  May 12              15.41    Jun 30 1975
         ANNUAL RUNOFF (AC-FT)              72140                     134200                      41320
         10 PERCENT EXCEEDS                   210                        659                         85
         50 PERCENT EXCEEDS                    25                         31                          3.7
         90 PERCENT EXCEEDS                     3.1                        7.1                        1.8

         e  Estimated

                                                     WATER-QUALITY RECORDS

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


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

                                 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
            07...       1310      2.9      --       --       --      391     17.0     11.5       --       --       --
          DEC
            15...       1155     51        --       --       --     1720      1.0       .0       --       --       --
          JAN
            28...       1110      6.4      --       --       --     2440     -6.0      1.0       --       --       --
          MAR
            17...       1415    374        --       --       --      683       --      2.0       --       --       --
            27...       1050   1080       8.2       --      557      556      3.5      3.5      220       50      22
          APR
            07...       1345   1120        --       --       --      891     14.5     10.0       --       --       --
          MAY
            06...       1155    110        --       --       --     1590     14.0     17.0       --       --       --
          JUN
            15...       1540     21        --       --       --     1640     22.5     20.5       --       --       --
          JUL
            22...       1140     17       7.8      7.9     1420     1420     30.0     30.0      610      130      69
          SEP
            08...       1455    232        --       --       --     1380     15.0     16.5       --       --       --


                                                                 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)

               OCT
                 07...        --       --       --       --       --       --       --       --       --       --
               DEC
                 15...        --       --       --       --       --       --       --       --       --       --
               JAN
                 28...        --       --       --       --       --       --       --       --       --       --
               MAR
                 17...        --       --       --       --       --       --       --       --       --       --
                 27...       10        .9      22       29       135      15        .10     140    1250       427
               APR
                 07...        --       --       --       --       --       --       --       --       --       --
               MAY
                 06...        --       --       --       --       --       --       --       --       --       --
               JUN
                 15...        --       --       --       --       --       --       --       --       --       --
               JUL
                 22...       13       2        24       91       272      28        .20     510      48.7    1080
               SEP
                 08...        --       --       --       --       --       --       --       --       --       --


                           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
                 07...        --       --       --       --       --       --       --       --       --       --
               DEC
                 15...        --       --       --       --       --       --       --       --       --       --
               JAN
                 28...        --       --       --       --       --       --       --       --       --       --
               MAR
                 17...        --       --       --       --       --       --       --       --       --       --
                 27...       347       3       50      <1.0      30        30      <.1     <1.0      <1       250
               APR
                 07...        --       --       --       --       --       --       --       --       --       --
               MAY
                 06...        --       --       --       --       --       --       --       --       --       --
               JUN
                 15...        --       --       --       --       --       --       --       --       --       --
               JUL
                 22...      1010       4       60       1.0      90       380      <.1      3.0      <1       630
               SEP
                 08...        --       --       --       --       --       --       --       --       --       --

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