About this river
Jocko River is a 4.0 mile river near LB Snow in Montana. Streamflow is measured at the USGS gauge South Fork Jocko River near Arlee MT (site 12381400). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1983 to 2025
Jocko River typically runs highest in June, at a median 195 cfs, and lowest in January, at 11 cfs. The highest flow on record for any single day is 1,060 cfs, in 1997.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 11 | 9.0 to 15 | |
| February | 11 | 8.8 to 14 | |
| March | 14 | 10 to 19 | |
| April | 45 | 27 to 74 | |
| May | 192 | 137 to 291 | |
| June | 195 | 138 to 270 | |
| July | 77 | 52 to 94 | |
| August | 36 | 31 to 45 | |
| September | 26 | 21 to 30 | |
| October | 21 | 18 to 24 | |
| November | 18 | 15 to 22 | |
| December | 13 | 10 to 18 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 43 years of record. Statistics published by the US Geological Survey for South Fork Jocko River near Arlee MT (site 12381400). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Jocko River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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