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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 27 117 301 134 51 30 24 22 18
2 13 12 13 27 119 296 128 50 30 23 22 18
3 13 12 13 28 126 297 123 49 29 23 21 17
4 13 12 13 30 135 293 119 48 28 23 22 17
5 13 12 13 31 145 284 114 46 28 22 22 16
6 13 12 13 33 157 277 109 46 28 22 22 16
7 14 12 13 34 171 272 105 45 28 22 22 16
8 14 12 14 36 171 265 101 44 28 22 22 15
9 14 12 15 38 173 248 97 43 28 22 21 15
10 14 12 16 40 177 243 94 42 27 22 20 16
11 13 12 15 42 182 238 92 42 27 21 20 15
12 12 12 16 43 185 227 88 41 28 21 19 16
13 12 12 16 46 195 222 86 41 27 21 22 16
14 12 12 18 50 210 219 84 40 26 21 21 16
15 12 12 18 51 221 216 80 39 26 21 19 16
16 12 12 19 52 237 213 78 38 26 22 19 16
17 12 12 19 54 259 208 76 37 26 24 19 16
18 12 12 19 56 270 203 73 36 26 22 19 15
19 12 12 20 60 266 200 71 36 26 22 19 15
20 12 12 20 66 268 191 69 35 26 22 18 14
21 12 12 20 73 267 186 67 36 26 22 18 14
22 13 12 21 82 263 182 65 35 26 21 18 13
23 12 12 21 91 266 177 64 34 25 21 17 13
24 12 12 21 97 271 171 62 34 24 21 18 13
25 13 12 22 97 274 163 60 33 24 21 18 12
26 12 12 22 98 280 155 58 32 23 21 18 13
27 12 12 22 102 283 148 58 32 24 21 17 13
28 12 13 24 106 286 143 56 31 23 22 17 13
29 12 10 25 109 291 141 54 30 23 21 17 13
30 12   25 113 296 139 53 30 23 21 18 13
31 12   26   299   52 30   21   13