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USGS Daily Statistics for Montana

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Questions or concerns about USGS streamflow data in Montana and Wyoming can be directed to Kirk Miller (kmiller@usgs.gov; 307-775-9168).


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 -> 2020-09-30)

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 12 13 26 105 299 135 52 30 24 22 18
2 12 12 13 27 106 296 129 50 30 23 22 17
3 13 12 13 28 113 295 125 49 29 23 21 17
4 13 12 13 29 123 288 120 48 28 23 22 16
5 13 12 13 30 132 281 115 47 28 23 22 16
6 13 12 13 33 142 275 111 46 28 22 22 16
7 14 12 13 34 157 270 106 45 28 22 22 15
8 14 12 14 35 162 264 102 44 28 22 22 15
9 14 12 15 38 168 248 98 43 29 22 21 15
10 14 12 16 40 174 240 95 42 28 22 20 15
11 13 12 15 41 180 232 93 42 27 22 20 15
12 13 12 16 42 183 223 89 41 28 22 19 16
13 13 12 17 45 194 219 87 41 27 21 21 16
14 12 12 19 49 209 217 85 40 27 21 20 16
15 12 12 18 50 220 216 81 39 27 22 19 16
16 12 12 20 51 234 215 79 39 27 23 19 16
17 12 12 19 54 255 210 77 38 26 23 19 15
18 12 12 19 57 267 204 74 37 27 22 18 15
19 12 12 20 61 263 200 72 36 27 22 18 14
20 12 13 20 69 260 190 70 35 26 21 18 14
21 12 13 20 76 259 186 68 35 26 21 18 13
22 13 13 21 85 260 182 66 35 25 21 18 13
23 13 13 21 94 266 178 64 34 25 21 17 13
24 12 12 21 99 272 173 62 34 24 21 18 13
25 13 12 22 100 275 164 61 33 24 21 18 12
26 12 12 22 100 278 157 59 32 24 21 18 12
27 12 12 22 103 279 149 58 32 24 21 17 12
28 12 13 23 105 280 144 57 31 23 22 17 12
29 12 10 23 106 285 141 55 31 23 22 17 13
30 12   24 106 291 139 53 30 23 21 18 13
31 12   25   294   52 30   21   13