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USGS Daily 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 06035000 Willow Creek near Harrison MT


Madison County, Montana
Hydrologic Unit Code 10020005
Latitude  45°43'23.01", Longitude 111°44'27.69" NAD83
Drainage area 85.9  square miles
Gage datum 4,750 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1937-10-01 -> 2024-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 26 24 27 37 49 83 110 17 13 24 34 33
2 26 25 28 38 49 84 107 16 13 25 34 34
3 26 31 28 37 50 90 106 15 13 26 34 34
4 25 30 28 37 51 96 103 15 13 26 35 34
5 25 27 28 38 50 99 99 14 13 26 35 32
6 25 27 29 39 51 106 95 14 14 26 35 31
7 25 28 29 39 53 111 92 13 14 27 35 31
8 25 27 29 39 53 115 88 12 15 27 35 31
9 25 27 29 40 53 117 84 12 16 27 34 30
10 24 27 29 40 55 119 81 11 15 27 34 31
11 24 27 29 40 57 121 79 11 16 28 33 32
12 25 27 28 39 56 114 73 11 17 28 34 31
13 25 27 28 38 57 116 68 10 17 28 33 31
14 26 27 28 39 56 113 64 10 17 28 32 30
15 26 26 28 39 58 112 59 10 17 29 32 30
16 26 27 30 38 61 119 54 11 18 29 32 30
17 26 27 33 38 66 124 50 11 18 29 32 30
18 25 27 32 39 68 126 48 10 21 30 33 30
19 24 28 32 40 68 129 43 10 22 30 33 29
20 24 28 32 42 67 126 40 11 22 30 33 29
21 24 28 33 43 69 127 36 12 23 30 33 29
22 24 27 35 43 72 129 34 12 22 31 33 28
23 24 27 34 45 73 126 30 12 23 31 34 29
24 23 27 34 46 74 125 27 12 22 32 35 29
25 23 28 33 47 74 125 25 12 22 32 36 29
26 23 28 36 46 74 126 23 12 22 32 35 28
27 24 28 37 46 75 127 21 12 24 32 33 28
28 24 28 36 45 76 121 20 11 24 32 33 27
29 24 30 37 47 80 115 18 12 24 32 33 26
30 25   37 48 82 112 18 13 25 32 33 26
31 24   37   83   18 13   33   26