05083500 RED RIVER OF THE NORTH AT OSLO, MN

List Of Figures:

Annual mean discharge
Annual flow duration

LOCATION.--Lat 48°11'40'', long 97°08'30", in SW1/4SW1/4 sec.36, T.155 N., R.51 W., Walsh County, Hydrologic Unit 09020306, on bridge crossing the Red River 0.5 mi west of Oslo, Minn.
DRAINAGE AREA.--31,200 mi2, approximately, including 3,800 mi2 in closed basins.
PERIOD OF RECORD.--1936 to 1937, 1941 to 1943, 1945 to 1960, 1974 to 1976, operated as a continuous-record gaging station; 1985 to current, operated as a crest-stage station.
GAGE.--Wire-weight gage. Datum of gage is 772.65 ft above mean sea level, datum of 1929. Prior to Apr. 2, 1948, staff gage on railroad bridge 200 ft upstream and Apr. 3, 1948, to Sept. 8, 1959, wire-weight gage at bridge 620 ft downstream, both at datum 5.00 ft higher.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 120,000 ft3/s, Apr. 23, 1997, gage height, 38.00 ft; no flow at times.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage known, about 37.5 ft in 1897, present datum.

Annual mean discharge

Annual mean discharge 05083500 RED RIVER OF THE NORTH AT OSLO, MN 
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                              Statistics of monthly and annual mean discharges
__________________________________________________________________________________________________________

                  Maximum                  Minimum                              Mean
           ______________________   ______________________   _____________________________________________

                       Water year                 Water year              Standard     Coeffi-    Percentage
 Month     Discharge       of         Discharge       of       Discharge  deviation    cient of   of annual
            (ft3/s)    occurrence      (ft3/s)    occurrence    (ft3/s)     (ft3/s)    variation   discharge
__________________________________________________________________________________________________________

October      3,770     1974            13.8      1937            2,020       1,550       0.77       5.14
November     2,440     1974            2,020     1975            2,270       222         0.10       5.79
December     1,940     1974            1,240     1975            1,650       368         0.22       4.22
January      1,740     1974            1,300     1975            1,580       244         0.15       4.03
February     1,680     1976            1,430     1975            1,590       139         0.09       4.06
March        3,310     1976            1,730     1975            2,350       837         0.36       6.00
April        27,000    1950            1,520     1937            9,710       6,700       0.69       24.8
May          40,900    1950            1,430     1958            6,780       8,540       1.26       17.3
June         11,800    1950            286       1936            4,150       3,090       0.74       10.6
July         25,600    1975            92.9      1936            4,560       5,790       1.27       11.6
August       3,170     1949            31.2      1936            1,630       1,040       0.64       4.16
September    2,240     1975            18.9      1936            904         808         0.89       2.31
Annual       6,700     1975            2,480     1976            4,690       2,120       0.45       100

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Annual flow duration

Annual flow duration 05083500 RED RIVER OF THE NORTH AT OSLO, MN 
----------------------------------------------------------------------------------------------------------------------
                              Monthly and annual flow duration, in cubic feet per second
                          [ng, statistic not given because of less than 10 years of record]
________________________________________________________________________________________________

 Percentage
  of days
 discharge   Jan.  Feb.  March  April  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Annual
 equaled or
  exceeded
_______________________________________________________________________________________________

  95         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  90         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  85         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  80         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  75         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  70         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  65         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  60         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  55         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  50         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  45         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  40         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  35         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  30         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  25         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  20         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  15         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  10         ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng
  5          ng    ng    ng     ng     ng   ng    ng    ng    ng     ng    ng    ng    ng

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                            Probability of annual high discharges
                                  [ng, statistic not given]
__________________________________________________________________________________________________

                                                       Maximum average discharge
                                                               (ft3/s)
                                       ___________________________________________________________

             Recurrence     Maximum
Exceedance    interval   instantaneous  3-day period  7-day period  15-day period  30-day period
probability    (years)      (ft3/s)
__________________________________________________________________________________________________

  0.99         1.01       ng              ng            ng            ng             ng
  0.95         1.05       ng              ng            ng            ng             ng
  0.90         1.11       ng              ng            ng            ng             ng
  0.80         1.25       ng              ng            ng            ng             ng
  0.50         2          ng              ng            ng            ng             ng
  0.20         5          ng              ng            ng            ng             ng
  0.10         10         ng              ng            ng            ng             ng
  0.04         25         ng              ng            ng            ng             ng
  0.02         50         ng              ng            ng            ng             ng
  0.01         100        ng              ng            ng            ng             ng
  0.005        200        ng              ng            ng            ng             ng
  0.002        500        ng              ng            ng            ng             ng

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           Annual peak discharge and corresponding gage height, period of record
                                 [--, no data]
_____________________________________________________________________________________

                     Gage     Peak                           Gage     Peak
Water    Date       height  discharge   Water    Date       height  discharge
year                (feet)   (ft3/s)    year                (feet)   (ft3/s)
_____________________________________________________________________________________

          Annual peak discharge, by year, and corresponding gage height

1936    April 18  --         15,000     1959    April 7     10.78    7,200
1937    May 4       6.47     4,070      1960    April 12  --         17,100
1942    April 4   --         12,500     1974    April 19  --         133,000
1943    April 13    29.16    31,500     1975    April 23  --         142,500
1945    March 26  --         24,000     1976    April 5   --         123,200
1946    March 30    25.11  --           1985    May 20      24.43    17,800
1947    April 22  --         33,800     1986    April 3     34.20    30,000
1948    April 17  --         41,400     1987    March 30    31.76    18,500
1949    April 10    24.08    18,700     1988    April 6     20.10    11,500
1950    May 10      31.83    63,000     1989    April 14    36.72    33,500
1951    April 12    25.46    24,800     1990    April 5     15.64    4,900
1952    April 21  --         24,800     1991    July 10     12.04    5,200
1953    June 25     17.55    14,900     1992    March 15    22.47    8,200
1954    April 15    12.39    9,790      1993    April 7   --         28,100
1955    April 10    19.46    16,400     1994    July 13     30.86    26,600
1956    April 24    25.50    22,500     1995    April 1     35.35    35,000
1957    July 2      17.42    14,900     1996    April 22    36.95    59,200
1958    July 10     10.29    7,890      1997    April 23    38.00    120,000

Annual peak discharge, from highest to lowest, and corresponding gage height

1997    April 23    38.00    120,000    1949    April 10    24.08    18,700
1950    May 10      31.83    63,000     1987    March 30    31.76    18,500
1996    April 22    36.95    59,200     1985    May 20      24.43    17,800
1975    April 23  --         142,500    1960    April 12  --         17,100
1948    April 17  --         41,400     1955    April 10    19.46    16,400
1995    April 1     35.35    35,000     1936    April 18  --         15,000
1947    April 22  --         33,800     1953    June 25     17.55    14,900
1989    April 14    36.72    33,500     1957    July 2      17.42    14,900
1974    April 19  --         133,000    1942    April 4   --         11,900
1943    April 13    29.16    31,500     1988    April 6     20.10    11,500
1986    April 3     34.20    30,000     1954    April 15    12.39    9,790
1993    April 7   --         28,100     1992    March 15    22.47    8,200
1994    July 13     30.86    26,600     1958    July 10     10.29    7,890
1951    April 12    25.46    24,800     1959    April 7     10.78    7,200
1952    April 21  --         24,800     1991    July 10     12.04    5,200
1945    March 26  --         24,000     1990    April 5     15.64    4,900
1976    April 5   --         123,200    1937    May 4       6.47     4,070
1956    April 24    25.50    22,500     1946    March 30    25.11  --

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1Daily mean. 
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                             Monthly and annual mean discharges, in cubic feet per second
          [Data were not rounded in accordance with U.S. Geological Survey publication standards; --, no data]
__________________________________________________________________________________________________________________________________

Year     Oct.     Nov.     Dec.     Jan.     Feb.     March    April    May      June     July     Aug.     Sept.    Annual
__________________________________________________________________________________________________________________________________

1936  --       --       --       --       --       --         5,111     1,634     286.4     92.9      31.2     18.9   --
1937    13.8   --       --       --       --       --         1,521     1,715     935.2   --        --       --       --
1941  --       --       --       --       --       --       --        --        --        --        --       --       --
1942  --       --       --       --       --       --         6,819     6,405   --          1,695   --       --       --
1943  --       --       --       --       --       --       --        --        --        --        --       --       --

1945  --       --       --       --       --       --         12,910    5,982     3,314     --      --       --       --
1946  --       --       --       --       --       --         10,230    3,471     2,074     --      --       --       --
1947  --       --       --       --       --       --       --          7,775     10,690    4,502   --       --       --
1948  --       --       --       --       --       --       --          8,278     2,508   --        --       --       --
1949  --       --       --       --       --       --       --          2,791     5,193     3,400     3,171  --       --

1950  --       --       --       --       --       --         27,050    40,940    11,750    7,936   --       --       --
1951  --       --       --       --       --       --         15,340    8,444     4,310   --        --       --       --
1952  --       --       --       --       --       --         17,260    5,556     3,604     5,762     2,033  --       --
1953  --       --       --       --       --       --         3,266     3,068     9,069     4,738     2,124  --       --
1954  --       --       --       --       --       --         4,967     3,583     3,336     2,167   --       --       --

1955  --       --       --       --       --       --         6,010     1,826     2,424     2,219     1,625  --       --
1956  --       --       --       --       --       --         9,280     5,602     2,979     1,479     763.1  --       --
1957  --       --       --       --       --       --         4,573     3,271     4,363     6,140     2,470  --       --
1958  --       --       --       --       --       --         2,686     1,433     1,359     3,739     915.4    427.8  --
1959  --       --       --       --       --       --         3,496     1,696     2,530     1,972     724.0    499.3  --

1960  --       --       --       --       --       --         9,289     3,328     2,699     1,954     541.1    607.0  --
1974    3,768    2,443    1,945    1,735    1,654    2,023    17,290    13,940    6,293     3,000     2,742    1,813    4,891
1975    1,944    2,020    1,240    1,299    1,431    1,732    17,610    15,830    5,887     25,590    3,087    2,243    6,699
1976    2,335    2,350    1,773    1,707    1,685    3,306    9,705     2,625     1,546     1,125     993.2    716.8    2,481

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