LITTLE MISSOURI RIVER BASIN

                                        06335500  LITTLE MISSOURI RIVER AT MARMARTH, ND

LOCATION.--Lat 4617'44", long 10355'06", in SW1/4 sec.30, T.133 N., R.105 W., Slope County, Hydrologic Unit 10110203, on left
   bank 90 ft downstream from bridge on U.S. Highway 12 in Marmarth, and 1.5 mi downstream from Little Beaver Creek.

DRAINAGE AREA.--4,640 mi2, approximately.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--March 1938 to current year.

REVISED RECORDS (WATER YEARS).--WSP 896: 1938-39. WSP 1086: 1943-44. WSP 1279: 1943(M), 1945-46, 1948. WSP 1439: 1950 (calendar
   year figures).

GAGE.--Water-stage recorder. Datum of gage is 2,686.32 ft above sea level. Prior to June 23, 1950, various nonrecording gages on
   former highway bridge at present site and datum. June 23, 1950, to Sept. 2, 1957, nonrecording gage at site 90 ft upstream at
   present datum.

REMARKS.--Records good except for periods of estimated discharge, which are poor. Small diversions for irrigation upstream from
   station.

EXTREMES OUTSIDE PERIOD OF RECORD.--According to local residents, the greatest known flood prior to 1953 occurred in June 1907
   (stage unknown). Other major floods reached stages of about 21.5 ft in March 1913, 19.7 ft in March 1920, and 20.2 ft in
   May 1929. These stages are not comparable to stages during period of record, owing to construction of levees.

                          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        37       34      e33    e18       e9.5     e500       57       57       43       25     33       2.2
          2        39       32      e32    e18      e10       e450       59       57       40       25     30       2.0
          3        40       31      e31    e19      e10       e400       62       53       46       24     30       1.6
          4        42       31      e30    e19       e9.5     e300       64       51      137       24    e30       1.4
          5        42       35      e30    e18       e9.0     e250       65       48       79       24    e25       1.1

          6        40       35      e30    e17      e10        210       60       46       61      435    e20       1.5
          7        39       34      e31    e17      e15        211       56       49       50      857    e13       1.9
          8        40       33      e31    e17      e25        186       55       63       42      184    e10       1.6
          9        39       33      e31    e17      e70        166       53       91       36      112     e8.0     1.2
         10        37       34      e30    e17      e60        154       50       72       37       92     e6.5      .89

         11        37       33      e30    e17      e50        142       50       59       33      301     e5.0    e1.9
         12        37       33      e29    e16      e40        134       46       55       31      245     e4.5     3.6
         13        36       33      e28    e16      e38        120       45       54       37      101     e3.0     3.8
         14        35       33      e27    e14      e35        129       47       58      190       65     e2.7     4.3
         15        36       33      e25    e13      e34        126       46       54      178       46     e2.3     4.0

         16        39       34      e24    e12      e33        118       48       53      135       33      1.6     3.2
         17        40       34      e23    e11      e32        115       47       52      116       31      1.9     2.3
         18        40      e34      e22    e10      e30        122       43       49       90       71      2.0     1.5
         19        40      e34      e21     e9.5    e27        123       40       50       72       69      1.6     2.9
         20        44      e34      e21     e9.0    e30        124       38       49       56       54      1.9     3.8

         21        42      e34      e20     e9.0    e35        122       37       47       79       43      1.2     4.5
         22        40      e34      e20     e9.0   e100        107       36       45       75       35      2.1     5.8
         23        38      e33      e19     e9.0   e200         96       34       39       60       32      3.1     6.8
         24        37      e33      e19    e10     e400         89       43       34       51       31      2.2     7.3
         25        36      e33      e18     e9.0   e350         83       44       28       44       31      1.9     7.6

         26        36      e33      e18    e10     e320         77       51       33       37       31      1.7     8.4
         27        36      e33      e18    e10     e290         69       48       59       34       30      1.2     8.5
         28        36      e34      e18    e19     e280         66       46      103       31       30      1.2     8.6
         29        35      e34      e18     e9.0   e300         64       43       81       28       67      1.1     9.0
         30        35      e34      e18     e9.0      ---       63       48       62       25       97      1.4     8.8
         31        35      ---      e18     e9.0      ---       59      ---       50      ---       54      1.9      ---

        TOTAL    1185     1002      763    416.5   2852.0     4975     1461     1701     1973     3299    251.0   121.99
        MEAN     38.2     33.4     24.6     13.4     98.3      160     48.7     54.9     65.8      106     8.10     4.07
        MAX        44       35       33       19      400      500       65      103      190      857       33      9.0
        MIN        35       31       18      9.0      9.0       59       34       28       25       24      1.1      .89
        AC-FT    2350     1990     1510      826     5660     9870     2900     3370     3910     6540      498      242

        STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1938 - 2000, BY WATER YEAR (WY)

        MEAN      112     36.0     16.9     17.5      199      933      790      605      666      221     81.7     71.8
        MAX      1489      250      107      260     2208     5079     6691     3840     4705     1917      400      526
        (WY)     1972     1999     1952     1973     1943     1978     1952     1975     1944     1993     1993     1941
        MIN       .87      .37     .000     .000     .000     23.1     10.7     4.75     3.51      .10      .16     .000
        (WY)     1959     1956     1956     1939     1939     1992     1981     1980     1961     1980     1988     1955

        SUMMARY STATISTICS           FOR 1999 CALENDAR YEAR        FOR 2000 WATER YEAR           WATER YEARS 1938 - 2000

        ANNUAL TOTAL                      135578.0                    20000.49
        ANNUAL MEAN                          371                         54.6                      314
        HIGHEST ANNUAL MEAN                                                                        986              1944
        LOWEST ANNUAL MEAN                                                                          20.5            1988
        HIGHEST DAILY MEAN                  3880     Mar 20             857     Jul  7           28600       Apr  5 1944
        LOWEST DAILY MEAN                      7.5   Jan 20                .89  Sep 10                .00    Dec 18 1938
        ANNUAL SEVEN-DAY MINIMUM               7.9   Jan 18               1.4   Sep  4                .00    Dec 18 1938
        INSTANTANEOUS PEAK FLOW                                        1430     Jul  6           45000       Mar 23 1947
        INSTANTANEOUS PEAK STAGE                                          4.36  Jul  6              23.40    Mar 31 1952
        ANNUAL RUNOFF (AC-FT)             268900                      39670                     227600
        10 PERCENT EXCEEDS                  1240                        117                        646
        50 PERCENT EXCEEDS                    68                         34                         34
        90 PERCENT EXCEEDS                    10                          3.8                        1.0

        e  Estimated
        
        
                                                     WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water years 1950-51, 1970 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...       1130     42        --       --       --     2070     15.5      8.2       --       --       --
         NOV
           16...       1130     35        --       --       --     2030     12.0      5.3       --       --       --
         FEB
           17...       1500     32        --       --       --     2360       .0       .2       --       --       --
         MAR
           14...       1230    133        --       --       --     1640      8.0      4.0       --       --       --
           28...       1120     64       8.3      8.3     1890     1870     12.5      7.5      360     76.0     42.0
         APR
           26...       1155     52        --       --       --     2020     15.5     13.0       --       --       --
         JUL
           06...       1240    199        --       --       --      896     26.5     22.0       --       --       --
         AUG
           23...       1200      2.5     8.9      8.8     3120     3060     25.5     21.0      160     20.0     27.0


                                                                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...        --       --       --       --       --       --       --       --       --       --
              NOV
                16...        --       --       --       --       --       --       --       --       --       --
              FEB
                17...        --       --       --       --       --       --       --       --       --       --
              MAR
                14...        --       --       --       --       --       --       --       --       --       --
                28...       8.6       7       320      65       349     16.0       .4      690     236      1360
              APR
                26...        --       --       --       --       --       --       --       --       --       --
              JUL
                06...        --       --       --       --       --       --       --       --       --       --
              AUG
                23...      14.0      23       680      89       649     20.0       .6      930      14.7    2140


                          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...        --       --       --       --       --       --       --       --       --       --
              NOV
                16...        --       --       --       --       --       --       --       --       --       --
              FEB
                17...        --       --       --       --       --       --       --       --       --       --
              MAR
                14...        --       --       --       --       --       --       --       --       --       --
                28...      1360     <1.0      50       <1       80.0     20       <.1       2      <1.0      760
              APR
                26...        --       --       --       --       --       --       --       --       --       --
              JUL
                06...        --       --       --       --       --       --       --       --       --       --
              AUG
                23...      2080      1.0      30       <1      170       10       <.1      12       1.0      450

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