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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.


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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 12381400 South Fork Jocko River near Arlee MT


Lake County, Montana
Hydrologic Unit Code 17010212
Latitude  47°11'43.98", Longitude 113°51'02.65" NAD83
Drainage area 57.6  square miles
Gage datum 3,970 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 13 12 13 27 117 299 132 51 30 23 22 18
2 13 12 13 27 120 294 127 50 30 23 22 17
3 13 12 13 28 127 295 122 48 28 23 21 17
4 13 12 13 30 138 290 117 48 28 22 22 16
5 13 12 13 31 146 281 113 46 28 22 22 16
6 13 12 13 33 158 275 108 46 28 22 22 16
7 14 12 13 34 171 269 104 45 27 22 22 15
8 14 12 14 36 172 263 100 44 27 22 22 15
9 14 12 15 38 174 246 96 43 28 22 21 15
10 13 12 15 40 179 241 93 42 27 22 20 15
11 13 12 15 42 183 236 91 42 27 21 19 15
12 12 12 15 44 187 225 87 41 28 21 19 16
13 12 12 16 46 197 220 85 41 27 21 21 16
14 12 12 18 50 210 217 83 40 26 21 20 16
15 12 12 18 52 222 213 80 39 26 21 19 16
16 12 12 19 52 236 211 77 38 26 22 19 16
17 12 12 19 54 258 206 75 37 26 24 19 15
18 12 12 19 57 269 201 73 36 26 22 19 15
19 12 12 20 60 264 198 70 36 26 22 18 15
20 12 12 20 66 266 189 69 35 26 21 18 14
21 12 12 20 73 265 185 66 35 26 21 18 13
22 13 12 20 82 261 180 65 35 25 21 18 13
23 12 12 21 90 264 175 63 34 25 21 17 13
24 12 12 21 96 268 169 61 33 24 21 18 13
25 13 12 22 97 272 161 60 33 24 21 18 12
26 12 12 22 98 277 153 58 32 23 21 18 13
27 12 12 23 102 281 146 57 31 23 21 17 13
28 12 13 24 106 284 141 55 31 23 21 17 12
29 12 10 25 109 290 139 54 30 22 21 17 13
30 12   25 114 295 137 52 30 23 21 18 13
31 12   26   298   51 30   21   13