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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 12377150 Mission Creek ab reservoir nr St. Ignatius MT


Lake County, Montana
Hydrologic Unit Code 17010212
Latitude  47°19'12.69", Longitude 113°59'16.41" NAD83
Drainage area 13.5  square miles
Gage datum 3,460 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 1982-10-01 -> 2025-09-30)

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 12 10 9.5 13 45 185 191 73 36 28 24 16
2 12 10 9.5 13 45 189 178 71 34 28 24 17
3 12 10 9.6 13 49 202 171 67 33 26 24 16
4 12 10 9.6 14 52 198 169 64 32 26 23 16
5 12 10 9.6 15 55 203 157 62 31 26 24 16
6 12 10 9.7 15 60 201 155 60 32 25 24 15
7 12 10 9.8 15 65 195 152 59 32 25 24 15
8 12 10 9.7 16 68 197 149 57 31 24 25 15
9 12 10 9.7 17 70 188 144 55 34 24 24 15
10 12 10 9.9 18 72 188 140 53 32 24 22 15
11 11 10 10 18 73 189 139 52 30 25 22 15
12 11 9.8 10 19 77 173 136 51 33 24 21 15
13 11 9.9 11 19 88 179 133 50 33 24 22 14
14 11 9.8 11 20 96 185 134 49 31 24 21 14
15 11 9.7 11 21 99 182 123 47 30 24 21 14
16 11 9.8 12 21 106 183 116 47 29 24 20 14
17 11 9.7 12 24 120 185 114 46 29 26 20 13
18 11 9.7 12 24 118 182 109 45 30 25 20 13
19 11 9.7 12 25 119 178 105 43 30 24 19 13
20 11 9.7 12 27 122 174 104 42 29 24 19 13
21 11 9.7 12 29 124 182 99 42 30 24 19 13
22 11 9.7 12 33 126 190 98 42 30 24 19 13
23 11 9.6 12 36 126 197 96 43 28 24 19 13
24 11 9.4 12 39 128 194 90 44 27 24 19 13
25 11 9.5 12 38 136 189 87 42 26 23 19 12
26 11 9.5 12 37 148 187 84 42 26 23 18 12
27 10 9.4 12 40 159 187 84 39 26 23 18 12
28 10 9.5 13 38 163 193 80 37 26 24 17 12
29 10 9.1 13 39 170 195 77 36 25 24 17 12
30 10   12 42 175 200 76 36 26 23 17 12
31 10   12   184   74 36   23   12