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USGS Surface-Water Monthly Statistics for Montana

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Questions or concerns about USGS data and data products in Montana and Wyoming can be directed to the Wyoming-Montana Water Science Center Data Management Section.


The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 12359800 S F Flathead R ab Twin C nr Hungry Horse MT


Flathead County, Montana
Hydrologic Unit Code 17010209
Latitude  47°58'44.75", Longitude 113°33'38.46" NAD83
Drainage area 1,159  square miles
Gage datum 3,575 feet above NAVD88
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00060, Discharge, cubic feet per second,
YEAR Monthly mean in ft3/s   (Calculation Period: 1964-10-01 -> 2020-09-30)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1964 837.7619.9836.5
1965 604.9505.7541.72,9258,61011,5503,8071,1471,583998627528.2
1966 412344.9504.62,5218,2086,7542,148649423.4347.8379.7397.6
1967 384419.2383.7946.38,24414,0004,081796.4407500.3995.5512.7
1968 540.36461,1021,1716,2989,2362,734871.71,3301,323932.2546.2
1969 600.3456.1473.44,1018,8356,4402,770682.5407.6464.5373.6308.4
1970 310.6333.5350.7550.68,53411,8402,286721.6446.1433.8443.8454.2
1971 676.42,285727.82,43312,13010,8903,8791,026486.1366.8328.5249.3
1972 251281.61,3421,8399,55814,1504,0441,331602.4524.4412.4388.6
1973 352.9271.4343.9912.45,8005,6831,433483.3323.1314.5691.6508.5
1974 1,197673.9637.92,8496,46515,9104,5881,149600.1367.5355.4290.2
1975 263.5272.2281.9464.54,85213,3605,9041,234787.8838.71,1621,323
1976 671.6563.2461.22,87210,9108,1713,7821,084542.5351.5336.3293.3
1977 225.8275.2270.12,0654,7383,806843.7425.4447.1619.2631.3679.8
1978 428.6359.51,0173,5166,74410,1304,259980.1774.7405.7405.8288.5
1979 239295.9510.41,1939,0717,9041,796573.1400.8286.5226.9307.6
1980 206.7201.4252.53,1098,6625,6181,752644.4588434694.51,044
1981 995.9595.8764.32,5249,1497,2842,578736.9411.4349.8312.3302.5
1982 255585.6612.11,2577,72912,6604,310979482.2
1984 516.5472.9
1985 2,4889,6196,3861,226626.71,8531,8781,972
1986 3,7107,6826,7451,443511.5508.4478.7577.6
1987 3,5526,6892,522879.3491.4
1991 325.5404.8
1992 2,7386,5593,3371,300478.7486.4643.1487.8
1993 1,5618,2534,3862,8521,075943.1537.2394
1994 4,0647,0894,0011,158431.1273.1316.8376.3
1995 1,4425,2507,2412,335719423.7788.21,927
1996 3,5396,89311,6203,508907.7
1999 636.4957.4
2000 3,8197,5297,0941,939539.7351.9465.3265
2001 6,6594,5951,239468261.8291.3497.8
2002 1,8306,70711,2503,345742.2453.9331289.3
2003 3,3926,5086,6881,297455.2371.1472.2582.5
2004 4,0776,3135,4651,864691.3989.8958.2742.8
2005 2,1275,6015,3701,476515.1335.7650.7
2006 3,57210,2807,3911,449495.6338.4
2007 2,7877,5714,5451,087406.2293.3414.7416.9
2008 948.49,41510,4204,207869.5599.8522.51,137
2009 2,0316,9087,0082,134730.1354.4340.4532.2
2010 2,3265,2038,7122,506708.3688.2463.8612.5
2011 1,4058,46215,9409,7271,576598.6623.4555.5
2012 5,2887,3439,8452,932666.9330.7364.2915.2
2013 2,64710,0707,2051,729543.8407.9433.9343.7
2014 2,03810,64010,5103,885875.9494.1562.5
2015 3,4395,2983,879829.1368.3308241.6
2016 4,7195,9914,2741,217454.9312.9
2017 3,6129,6978,2721,466519.8344.2
2018 2,82716,1708,6612,390649.9344.8355.2
2019 3,1296,9735,0321,262511.2507.1692
2020 2,55310,0409,6332,741682.2353.2
Mean of
monthly
Discharge
479 520 588 2,580 7,910 8,160 2,600 728 546 547 625 514

** No Incomplete data have been used for statistical calculation