05046000 OTTERTAIL RIVER BELOW ORWELLL DAM NEAR FERGUS FALLLS, MN


List Of Figures:

Annual mean discharge
Annual flow duration


LOCATION.--Lat 4612'35'', long 9611'05", in NE1/4 sec.34, T.132 N., R.44 W., Otter Tail County, Hydrologic Unit 09020103, on left bank 0.7 mi downstream from Orwell Dam, 6.1 mi downstream from Dayton Hollow Dam, 8 mi southwest of Fergus Falls, and 11.1 mi downstream from Pelican River.
DRAINAGE AREA.--1,740 mi2.
PERIOD OF RECORD.--October 1930 to current year. Prior to October 1952, published as Otter Tail River below Pelican River near Fergus Falls. Monthly discharges only for some periods, published in Water-Supply Paper 1308.
GAGE.--Water-stage recorder. Datum of gage is 1,029.65 ft above sea level, adjustment of 1912. Oct. 11, 1930, to Nov. 17, 1933, at same site at datum 2.00 ft higher; Nov. 18, 1933, to Mar. 21, 1953, at site 6.1 mi upstream at datum 40.30 ft higher.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,710 ft3/s, June 17, 1953, gage height, 5.60 ft; minimum discharge, 0.70 ft3/s, Aug. 5, 1970, gage height 1.28 ft, caused by regulation.

Annual mean discharge

Annual mean discharge for 05046000 Otter Tail River below Orwell Dam near Fergus Falls, Minnesota
----------------------------------------------------------------------------------------------------------
                  Statistics of monthly and annual mean discharges, post-regulation period
__________________________________________________________________________________________________________

                  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      973       1994            9.15      1977          276           200         0.73       5.73
November     831       1986            8.42      1977          290           194         0.67       6.01
December     706       1987            8.10      1977          280           177         0.63       5.82
January      603       1986            19.8      1977          273           152         0.55       5.67
February     647       1994            22.4      1977          282           140         0.50       5.85
March        724       1994            30.4      1977          375           146         0.39       7.78
April        1,200     1997            45.8      1977          566           227         0.40       11.7
May          1,430     1986            14.1      1977          687           328         0.48       14.3
June         1,420     1986            55.0      1977          678           350         0.52       14.1
July         1,250     1953            59.8      1977          501           277         0.55       10.4
August       1,080     1985            50.4      1977          338           255         0.75       7.01
September    1,030     1993            9.17      1976          273           223         0.82       5.67
Annual       842       1986            37.5      1977          402           165         0.41       100

-----------------------------------------------------------------------------------------------------------

Annual flow duration, post-regulation period

Annual flow duration 05046000 Otter Tail River below Orwell Dam near Fergus Falls, Minnesota
----------------------------------------------------------------------------------------------------------------------
                      Monthly and annual flow duration, in cubic feet per second, post-regulation period
______________________________________________________________________________________________________________________

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


  95           79.9    94.9    126    193      188      132      80.6     52.3    31.3    62.9    59.1    62.1    67.7
  90           94.1    128     181    260      285      198      132      74.0    52.8    76.8    104     93.5    101
  85           114     144     203    316      335      257      179      88.0    68.9    91.8    120     113     134
  80           143     163     220    362      370      321      228      110     83.9    110     135     135     163
  75           163     180     236    387      414      394      278      141     106     131     150     152     188
  70           182     192     255    411      467      458      325      166     126     145     164     167     212
  65           198     207     280    433      526      504      360      192     150     161     182     181     236
  60           213     223     308    454      577      556      393      215     170     186     199     194     266
  55           229     240     332    482      625      607      422      237     188     202     216     220     297
  50           241     254     355    518      672      650      454      258     207     224     238     237     333
  45           253     269     381    556      720      694      496      292     232     263     268     253     369
  40           268     286     407    594      770      752      536      336     265     295     301     276     404
  35           291     311     431    636      821      815      574      369     302     318     322     306     446
  30           342     344     457    678      873      892      612      412     344     337     343     339     489
  25           378     375     485    744      926      963      675      464     397     356     379     385     548
  20           415     404     517    804      981      1,030    764      522     435     384     419     431     617
  15           458     443     562    859      1,050    1,110    853      631     481     444     465     484     701
  10           527     492     612    942      1,130    1,200    937      711     554     493     523     574     839
  5            583     562     700    1,060    1,310    1,330    1,070    915     773     769     749     673     1,010


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--------------------------------------------------------------------------------------------------
                    Probability of annual high discharges, post-regulation period
                                  [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             212           201           177            152
  0.95         1.05         456            362           343           312            282
  0.90         1.11         549            465           441           406            374
  0.80         1.25         676            608           579           541            507
  0.50         2            959            925           890           849            811
  0.20         5            1,280          1,250         1,230         1,180          1,130
  0.10         10           1,460          1,410         1,400         1,350          1,280
  0.04         25           1,650          1,560         11,540        1,510          1,420
  0.02         50           1,770          1,650         11,620        1,600          1,500
  0.01         100          1,880          1,710         11,700        1,680          1,560
  0.005        200          1,970          1,760         11,750        1,740          1,610
  0.002        500          2,080          ng            ng            ng             ng
------------------------------------------------------------------------------------------------------------
1 Statistical adjustment based on correlation between 3-, 7-, 15-, and 30-consecutive-day periods.
-------------------------------------------------------------------------------------
           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

1931    May 18         2.03     686        1965    June 14         4.74     1,330
1932    June 14      --         551        1966    June 1          4.59     1,490
1933    June 18      --         577        1967    May 18          4.14     1,130
1934    May 29         2.92     448        1968    May 14          3.37     714
1935    June 26      --         472        1969    May 31          4.43     1,260
1936    April 14       2.97     468        1970    June 22         3.88     935
1937    July 30        3.27     518        1971    April 9         3.53     755
1938    June 16      --         544        1972    June 3          4.44     1,360
1939    --             3.20     603        1973    March 15        3.48     714
1940    September 2    3.28     600        1974    June 3          4.31     1,310
1941    July 2       --         611        1975    June 21         4.09     1,090
1942    June 6         3.52     747        1976    March 29        3.27     663
1943    April 2        4.31     1,150      1977    September 19    2.88     300
1944    June 4         4.31     1,200      1978    April 9         4.07     1,040
1945    November 14    4.13     1,120      1979    April 17        4.11     1,110
1946    July 19      --         777        1980    April 9         3.84     903
1947    June 10        4.81     1,370      1981    August 4        2.75     267
1948    May 18       --         900        1982    May 29          3.71     849
1949    July 8         3.61     564        1983    July 20         3.11     524
1950    May 23       --         1,100      1984    June 15         3.64     808
1951    April 5      --         1,160      1985    June 27         4.29     1,270
1952    April 10       3.91     1,040      1986    May 27          4.75     1,600
1953    June 17        5.60     1,710      1987    June 30         3.97     1,050
1954    June 20        4.26     1,210      1988    March 25        3.05     408
1955    August 6       3.53     730        1989    April 10        4.17     1,180
1956    May 29         4.05     1,080      1990    June 14         3.37     650
1957    May 23         3.70     794        1991    July 1          4.00     1,050
1958    March 4        3.19     534        1992    July 25       --         589
1959    June 8         3.32     612        1993    July 24         4.34     1,290
1960    May 26         3.66     810        1994    May 6           4.30     1,280
1961    May 23         3.44     664        1995    March 20        4.28     1,250
1962    June 26        4.40     1,260      1996    May 25          4.29     1,260
1963    June 17        3.65     745        1997    May 22          4.63     1,500
1964    May 11         3.73     861

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

1953    June 17        5.60     1,710      1993    July 24         4.34     1,290
1986    May 27         4.75     1,600      1994    May 6           4.30     1,280
1997    May 22         4.63     1,500      1985    June 27         4.29     1,270
1966    June 1         4.59     1,490      1962    June 26         4.40     1,260
1947    June 10        4.81     1,370      1969    May 31          4.43     1,260
1972    June 3         4.44     1,360      1996    May 25          4.29     1,260
1965    June 14        4.74     1,330      1995    March 20        4.28     1,250
1974    June 3         4.31     1,310      1954    June 20         4.26     1,210
1944    June 4         4.31     1,200      1955    August 6        3.53     730
1989    April 10       4.17     1,180      1968    May 14          3.37     714
1951    April 5      --         1,160      1973    March 15        3.48     714
1943    April 2        4.31     1,150      1931    May 18          2.03     686
1967    May 18         4.14     1,130      1961    May 23          3.44     664
1945    November 14    4.13     1,120      1976    March 29        3.27     663
1979    April 17       4.11     1,110      1990    June 14         3.37     650
1950    May 23       --         1,100      1959    June 8          3.32     612
1975    June 21        4.09     1,090      1941    July 2        --         611
1956    May 29         4.05     1,080      1939    --              3.20     603
1987    June 30        3.97     1,050      1940    September 2     3.28     600
1991    July 1         4.00     1,050      1992    July 25       --         589
1952    April 10       3.91     1,040      1933    June 18       --         577
1978    April 9        4.07     1,040      1949    July 8          3.61     564
1970    June 22        3.88     935        1932    June 14       --         551
1980    April 9        3.84     903        1938    June 16       --         544
1948    May 18       --         900        1958    March 4         3.19     534
1964    May 11         3.73     861        1983    July 20         3.11     524
1982    May 29         3.71     849        1937    July 30         3.27     518
1960    May 26         3.66     810        1935    June 26       --         472
1984    June 15        3.64     808        1936    April 14        2.97     468
1957    May 23         3.70     794        1934    May 29          2.92     448
1946    July 19      --         777        1988    March 25        3.05     408
1971    April 9        3.53     755        1977    September 19    2.88     300
1942    June 6         3.52     747        1981    August 4        2.75     267
1963    June 17        3.65     745
------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------------------------
                             Monthly and annual mean discharges, in cubic feet per second
                [Data were not rounded in accordance with U.S. Geological Survey publication standards]
__________________________________________________________________________________________________________________________________

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

 1931    49.4     42.8     64.3     30.0     65.0     131.8    140.8    159.5    104.4    62.6     32.3     44.4     77.3
 1932    30.0     28.8     30.0     40.0     45.0     60.0     81.7     50.6     50.3     32.7     27.2     31.4     42.2
 1933    24.5     35.0     95.0     23.0     25.0     170.0    51.3     37.8     61.8     19.1     14.7     25.8     48.8
 1934    13.1     17.5     30.3     27.4     26.2     25.8     39.5     18.0     14.2     13.8     11.5     7.99     20.4
 1935    11.9     13.7     14.1     16.0     10.8     58.8     51.5     51.8     63.5     102.6    22.8     13.9     36.2

 1936    10.5     17.0     36.0     26.5     24.9     32.5     65.0     41.1     21.9     12.8     19.7     21.6     27.4
 1937    25.3     23.1     19.5     15.1     15.7     23.5     60.9     58.0     178.2    96.9     72.7     125.0    59.4
 1938    88.7     37.8     20.3     20.4     36.1     100.8    144.0    272.2    267.2    79.0     24.9     47.7     95.1
 1939    29.4     26.4     46.4     117.4    118.9    228.2    207.0    180.7    83.3     46.4     18.5     16.9     93.2
 1940    19.8     22.5     17.6     17.7     32.0     44.7     166.5    308.9    137.0    28.5     19.4     22.3     69.8

 1941    22.8     51.4     36.1     58.6     105.2    163.5    277.1    302.7    210.5    99.0     39.0     51.5     117.9
 1942    80.1     102.9    104.6    123.5    97.5     133.1    120.1    383.4    426.8    207.8    164.6    230.7    181.5
 1943    336.7    362.5    306.2    306.2    240.9    310.1    595.3    656.1    776.3    534.1    432.5    396.7    438.4
 1944    381.3    339.1    269.2    199.1    157.8    196.9    309.3    362.0    616.0    470.7    350.3    581.3    352.6
 1945    695.2    667.4    502.9    411.6    369.3    527.8    649.7    735.3    640.9    312.3    158.6    142.9    485.0

 1946    236.6    270.3    226.3    194.2    146.4    360.1    513.7    569.0    368.4    621.3    610.6    511.4    387.3
 1947    559.8    547.9    479.1    415.3    341.8    343.2    703.6    900.3    871.8    560.4    238.1    207.3    514.7
 1948    218.9    207.9    191.8    157.4    129.9    247.5    480.6    647.2    443.8    254.2    213.1    190.4    282.2
 1949    137.9    115.3    68.1     90.3     107.6    200.6    220.6    224.0    213.9    225.1    178.3    93.5     156.6
 1950    89.8     88.8     105.8    109.6    143.0    218.0    428.5    869.5    883.7    666.9    325.7    162.4    342.0

 1951    131.3    98.2     111.1    143.6    199.9    260.5    607.6    635.0    661.5    463.5    332.1    321.7    330.6
 1952    323.7    353.3    441.4    478.7    484.4    488.7    787.4    822.6    563.8    426.0    446.8    463.4    506.4
 1953    349.4    242.2    203.1    169.3    212.0    334.0    421.0    558.3    1,262    1,246    746.9    507.0    522.5
 1954    395.5    465.6    443.7    400.0    312.0    482.1    614.1    855.6    903.1    521.7    189.1    229.0    485.0
 1955    117.4    146.0    211.5    230.1    190.2    240.0    410.4    355.1    319.3    466.5    465.7    501.8    305.0

 1956    389.7    321.6    185.0    235.5    194.0    235.0    642.3    807.8    652.0    247.0    191.8    109.4    350.9
 1957    68.9     44.0     69.2     111.0    112.7    274.8    426.7    634.3    592.4    578.4    498.2    436.0    321.7
 1958    351.2    394.6    381.8    281.5    271.9    401.0    381.6    218.2    142.6    331.9    225.9    195.6    298.6
 1959    153.0    163.1    154.5    238.9    233.5    288.8    321.1    318.5    515.7    430.9    208.4    172.1    266.5
 1960    151.7    173.2    217.6    236.0    254.3    234.1    484.4    785.2    702.6    425.9    171.4    115.8    329.3

 1961    102.8    130.9    136.2    161.5    168.3    235.2    281.3    346.2    378.8    187.4    95.0     80.6     191.9
 1962    99.0     110.4    88.7     81.9     93.6     234.0    433.0    488.7    1,035    939.3    777.2    442.7    403.4
 1963    399.7    366.0    317.2    286.3    197.2    284.8    450.5    443.2    555.4    359.6    140.6    155.7    330.2
 1964    217.9    180.8    174.1    171.8    155.4    150.3    474.5    801.5    564.4    296.9    78.5     128.9    283.0
 1965    228.1    215.5    231.1    216.9    176.5    213.6    565.5    961.1    1,156    730.6    419.6    398.3    460.4


 1966    520.4    487.5    518.6    489.0    432.6    605.4    1,033    1,273    1,149    564.4    521.4    411.6    667.9
 1967    467.0    506.2    475.8    416.1    367.5    406.1    820.7    1,040    865.9    727.3    243.6    118.0    538.8
 1968    201.5    184.1    156.3    136.5    147.9    264.8    397.4    598.1    575.0    431.4    233.6    167.3    291.5
 1969    283.1    308.7    275.9    247.9    374.1    461.2    738.1    1,104    910.1    413.3    200.6    59.6     448.1
 1970    112.6    150.8    149.7    193.9    214.8    229.0    385.1    679.7    716.5    440.5    122.1    28.8     285.5

 1971    89.7     184.4    174.7    150.0    166.5    262.6    458.3    340.1    295.8    351.7    151.7    166.3    232.7
 1972    247.6    487.6    592.5    563.8    473.2    510.4    865.5    969.9    1,181    692.3    491.9    425.0    624.6
 1973    438.2    391.1    397.1    359.2    357.7    517.8    433.4    371.3    274.3    156.8    130.5    136.9    330.4
 1974    380.6    634.3    641.1    506.5    461.2    483.5    608.4    984.0    1,156    666.1    337.2    252.6    592.9
 1975    298.8    267.4    187.0    200.5    269.0    412.6    642.6    956.5    1,023    846.3    597.0    369.0    507.0

 1976    334.1    320.9    240.9    247.5    305.8    432.9    518.5    317.8    171.0    110.4    57.3     9.17     255.3
 1977    9.15     8.42     8.10     19.8     22.4     30.4     45.8     14.1     55.0     59.8     50.4     128.2    37.5
 1978    200.8    298.7    363.1    402.5    356.6    384.9    814.4    812.0    519.2    402.3    137.3    96.0     399.0
 1979    139.6    109.1    103.9    98.2     132.4    295.9    620.9    972.4    917.6    804.0    701.8    551.0    455.5
 1980    343.5    355.7    325.1    357.8    392.7    488.8    548.5    505.2    346.5    166.7    102.8    40.9     330.9

 1981    70.2     119.0    113.8    101.1    132.2    207.4    213.2    170.3    124.8    142.2    152.5    58.8     133.9
 1982    139.5    220.7    246.9    239.7    256.0    406.6    612.3    748.4    719.8    503.4    276.7    171.9    378.9
 1983    299.6    330.9    297.3    281.2    262.6    354.3    374.2    329.5    235.8    287.7    365.5    353.7    314.7
 1984    329.8    292.4    257.8    275.4    345.8    369.1    656.2    621.5    637.8    468.2    247.4    125.8    385.4
 1985    173.2    193.8    265.4    267.6    270.7    473.5    590.8    901.5    1,087    1,139    1,080    904.1    614.2

 1986    817.0    830.6    681.8    603.0    538.6    545.4    1,051    1,427    1,425    883.5    611.0    684.2    842.3
 1987    777.1    772.4    706.2    580.1    605.3    652.9    602.1    521.3    467.7    322.2    166.2    174.5    528.6
 1988    134.6    130.9    147.9    169.8    231.0    320.0    347.4    356.9    201.9    75.1     78.3     74.0     188.8
 1989    68.0     58.5     54.9     92.9     175.4    342.1    653.2    600.2    593.3    305.1    137.5    168.4    270.5
 1990    117.1    136.3    120.5    111.1    145.7    294.6    428.1    517.9    551.6    385.3    236.8    163.2    267.8

 1991    128.6    92.9     88.9     93.2     158.8    256.3    383.0    699.0    709.6    679.1    429.3    354.7    340.4
 1992    200.3    175.6    167.5    205.8    248.8    369.2    443.9    431.9    381.2    351.1    291.4    265.5    294.4
 1993    189.9    211.2    200.5    221.0    281.4    419.5    621.0    684.8    979.5    923.7    1,055    1,026    568.6
 1994    972.6    798.4    619.1    556.3    646.9    724.3    816.9    1,009    706.7    565.5    408.4    279.4    675.8
 1995    322.2    300.7    413.0    410.4    414.3    615.0    894.8    891.6    619.2    509.4    310.7    259.4    497.2

 1996    363.0    435.5    414.3    366.1    401.9    546.0    738.8    1,100    1,069    573.9    348.0    223.3    548.4
 1997    222.3    281.9    399.2    521.5    532.6    571.2    1,199    1,403    1,054    848.9    724.3    565.6    694.1


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