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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 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 -> 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 13 12 13 27 117 303 135 52 30 24 22 18
2 13 12 13 27 120 299 129 50 30 23 22 18
3 13 12 13 28 127 299 124 49 29 23 21 17
4 13 12 13 30 137 294 120 48 28 23 22 17
5 13 12 13 31 146 286 115 47 28 22 22 16
6 13 12 13 33 159 279 110 46 28 22 22 16
7 14 12 14 34 172 274 106 45 28 22 22 16
8 14 12 14 36 173 267 102 44 28 22 22 15
9 14 12 15 38 175 250 98 43 28 22 21 15
10 14 12 16 40 179 244 95 42 27 22 20 16
11 13 12 15 42 183 240 92 42 27 21 20 15
12 12 12 16 43 185 228 89 41 28 21 19 16
13 12 12 16 45 195 223 87 41 27 21 22 16
14 12 12 18 48 209 220 85 40 26 21 21 16
15 12 12 18 49 220 217 81 39 26 21 19 16
16 12 12 19 50 236 215 79 38 26 22 19 16
17 12 12 19 52 258 210 76 37 26 24 19 16
18 12 12 19 55 270 205 74 37 26 22 19 15
19 12 12 20 59 266 202 72 36 26 22 19 15
20 12 12 20 66 269 192 70 35 26 22 18 14
21 12 12 20 73 268 188 68 36 26 22 18 14
22 13 12 20 83 265 183 66 35 26 21 18 13
23 12 12 21 91 268 179 64 34 25 21 17 13
24 12 12 21 97 273 173 62 34 24 21 18 13
25 13 12 22 98 276 164 60 33 24 21 18 12
26 12 12 22 98 282 156 59 32 23 21 18 13
27 12 12 22 102 285 149 58 32 24 21 17 13
28 12 13 24 106 288 144 56 31 23 22 17 13
29 12 10 25 109 292 142 55 30 23 21 17 13
30 12   25 114 298 140 53 30 23 21 18 13
31 12   26   301   52 30   21   13