MISSOURI RIVER MAIN STEM

                                          06185500  MISSOURI RIVER NEAR CULBERTSON, MT
                                      (National stream quality accounting network station)

LOCATION.--Lat 4807'30", long 10428'20", in SE1/4NW1/4 sec.3, T.27 N., R.56 E., Richland County, Hydrologic Unit 10060005, on 
   right bank at upstream side of bridge on State Highway 16, 2.5 mi southeast of Culbertson, 10 mi downstream from Big Muddy 
   Creek, and at river mile 1,620.76.

DRAINAGE AREA.--91,557 mi2.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--July 1941 to December 1951, April 1958 to current year.

REVISED RECORDS.--WSP 1729:  Drainage area.

GAGE.--Water-stage recorder.  Datum of gage is 1,883.4 ft above sea level (U.S. Army Corps of Engineers bench mark).  July 1 to Nov. 6, 1941, water-stage recorder at site 400 ft upstream at datum 0.11 ft higher.  Nov. 7, 1941, to Aug. 17, 1950, water-stage recorder at site 580 ft downstream at present datum.  Aug. 18, 1950, to Dec. 31, 1951, nonrecording gage on bridge at present datum.  Apr. 1, 1958, to Nov. 1, 1967, water-stage recorder at site 580 ft downstream at present datum.

REMARKS.--Water-discharge records good except those for estimated daily discharges, which are poor.  Flow partly regulated by Fort Peck Lake (station number 06131500) and many other reservoirs upstream from station.  Diversions for irrigation of about  1,030,400 acres upstream from station. U.S. Army Corps of Engineers satellite telemeter at station.

                          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     e5790     5700     6000    10200    e9750    e8450     5780     8960    10000     8760     8390     8710
           2      5590     5660     7060    10300    e9750    e8800     5680     9540    10100     8720     8460     8810
           3      5640     5530     8010    10600    e9700    e8950     5630     9450    10300     9270     8750     9000
           4      5730     5760     8280    11300    e9400    e9200     5600     9210    10200     9600     9060     9070
           5      5720     5880     8240    e8410    e8600    e9300     5520     9220     9990    10000     8750     8960

           6      5710     5670     8150   e10800    e8450    e9000     5780     9470     9850    10200     8730     8890
           7      5620     5710     8150   e11200    e8300    e8790     6260     9530     9840     9770     8720     8770
           8      5680     5770     8290   e10200    e8300    e8450     6410     9470    10100    10200     8860     8910
           9      5630     5550     8970   e10200    e8500    e8100     6460     9360    10500    11100     8790     8890
          10      5540     5640     9380   e10200    e8650    e7000     6510     8990    10700    11700     8840     8930

          11      5580     5620     9460   e10200    e8500    e6500     6540     8880    10700    13500     8830     8870
          12      5720     5460     9400   e10300    e8650    e6500     6580     8980    10700    12800     8930     7440
          13      5720     5390     9450   e10700    e8450    e6550     6530     9230    10500    11400     8800     6210
          14      5490     5420     9440   e10000    e8250     6680     6470     9490    11000    10800     8710     5780
          15      5430     5350     9600   e10300    e8500     6420     6260     9310    11500    10900     8700     5620

          16      5540     5340    10000   e10500    e8500     6310     6380     9330    11600    11100     8640     5490
          17      5470     5260    10300   e10500    e8050     6200     6490     9370    11400    11400     8670     5530
          18      5520     5450    10400   e10500    e8500     6080     6650     9280    11000    11200     8750     5520
          19      5680     5740   e10300   e10500    e8500     6130     6820     9260     9950    10800     8720     5750
          20      5680     5860   e10300   e10500    e8500     6160     7150     9360     9670    10200     8710     5930

          21      5580     5780   e10200   e10500    e8500     6210     7470     9470     9560     9930     8880     5930
          22      5540     5700   e10600   e10500    e8500     6090     7610     9200     9440     9820     8760     5960
          23      5510     5700   e10300    e9300    e8500     5980     7640     9290     9230     9600     8600     5950
          24      5470     5690   e10300    e9500    e8350     5910     7560     9220     9060     9560     8740     5920
          25      5480     5680   e10200    e9500    e8350     5910     7500     9250     9030     9470     8750     5890

          26      5500     5730   e10100    e9500    e8000     5950     7470     9280     9160     9410     8750     5810
          27      5490     5790    e9950    e9500    e8450     5820     7390     9320     9090     9060     8860     5770
          28      5600     5740    e9950    e9500    e8450     5770     7340     9100     9070     8640     8890     5810
          29      5730     5710   e10100    e9500    e8450     5710     7090     9290     8970     8600     8810     5800
          30      5720     5760   e10000    e9500      ---     5690     7470     9650     8820     8680     8720     5810
          31      5720      ---   e10000    e9900      ---     5760      ---     9730      ---     8660     8760      ---

         TOTAL  173820   169040   290880   314110   249350   214370   200040   288490   301030   314850   271330   209730
         MEAN     5607     5635     9383    10130     8598     6915     6668     9306    10030    10160     8753     6991
         MAX      5790     5880    10600    11300     9750     9300     7640     9730    11600    13500     9060     9070
         MIN      5430     5260     6000     8410     8000     5690     5520     8880     8820     8600     8390     5490
         AC-FT  344800   335300   577000   623000   494600   425200   396800   572200   597100   624500   538200   416000

         STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1941 - 2000, BY WATER YEAR (WY)*                                

         MEAN    10910     9399     9194     9970    10620    10530    10730     9647     9785    10330    11500    11290
         MAX     28570    22440    13280    14400    17450    20690    32840    26220    26650    37050    25300    26590
         (WY)     1949     1952     1944     1986     1976     1976     1979     1979     1975     1975     1948     1948
         MIN      1237     1126     1061     1010     1167     2674     1965     1353     1366     1273     3823     3771
         (WY)     1942     1942     1942     1943     1942     1950     1945     1945     1945     1945     1963     1992

         SUMMARY STATISTICS           FOR 1999 CALENDAR YEAR        FOR 2000 WATER YEAR           WATER YEARS 1941 - 2000*

         ANNUAL TOTAL                     3629090                    2997040                                             
         ANNUAL MEAN                         9943                       8189                      10330                  
         HIGHEST ANNUAL MEAN                                                                      16580              1975
         LOWEST ANNUAL MEAN                                                                        4083              1942
         HIGHEST DAILY MEAN                 22400     Mar 28           13500     Jul 11           69200       Mar 27 1943
         LOWEST DAILY MEAN                   5260     Nov 17            5260     Nov 17             575       Nov 22 1941
         ANNUAL SEVEN-DAY MINIMUM            5380     Nov 12            5380     Nov 12             709       Nov 19 1941
         INSTANTANEOUS PEAK FLOW                                      a14200     Jul 12          c78200       Mar 26 1943
         INSTANTANEOUS PEAK STAGE                                        b13.92  Jan 11             b19.66    Apr 14 1979
         INSTANTANEOUS LOW FLOW                                                                     575       Nov 22 1941
         ANNUAL RUNOFF (AC-FT)            7198000                    5945000                    7482000                  
         10 PERCENT EXCEEDS                 12400                      10300                      16000                  
         50 PERCENT EXCEEDS                  9960                       8720                       9600                  
         90 PERCENT EXCEEDS                  5650                       5640                       4470                  

         SUMMARY STATISTICS                   FOR WATER YEARS 1941-51**          WATER YEARS 1958 - 2000***                                 

         ANNUAL MEAN                             9245                             10580                  
         HIGHEST ANNUAL MEAN                    14520             1948            16580              1975
         LOWEST ANNUAL MEAN                      4083             1942             6121              1963
         HIGHEST DAILY MEAN                     69200      Mar 27 1943            52000       Apr 18 1979
         LOWEST DAILY MEAN                        575      Nov 22 1941             2000       Nov 20 1964
         ANNUAL SEVEN-DAY MINIMUM                 709      Nov 19 1941             2130       Nov 19 1964
         INSTANTANEOUS PEAK FLOW               c78200      Mar 26 1943           d55000       Mar 23 1960
         INSTANTANEOUS PEAK STAGE                 b15.12   Mar 26 1943              b19.66    Apr 14 1979
         ANNUAL RUNOFF (AC-FT)                6698000                           7668000                  
         10 PERCENT EXCEEDS                     21000                             15200                  
         50 PERCENT EXCEEDS                      6910                              9800                  
         90 PERCENT EXCEEDS                      1400                              5940                  

         *--During period of operation (1941-52, 1958 to current year).
         **--Before operational level at Fort Peck Lake was reached.
         ***--After operational level of Fort Peck Lake was reached.
         a--Gage height, 6.86 ft.
         b--Backwater from ice.
         c--Gage height, 14.80 ft, from rating curve extended above 30,000 ft3/s.
         d--Gage height, 19.14 ft, backwater from ice.
         e--Estimated.

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