About this river
Missouri River is a 2.6 mile river near Helena Boat Rental in Montana. Streamflow is measured at the USGS gauge Missouri River bl Hauser Dam near Helena MT (site 06065500). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1923 to 2026
Missouri River typically runs highest in June, at a median 6,000 cfs, and lowest in October, at 3,480 cfs. The highest flow on record for any single day is 33,300 cfs, in 1927.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 3,690 | 3,090 to 4,600 | |
| February | 3,850 | 3,090 to 4,860 | |
| March | 4,020 | 3,370 to 4,960 | |
| April | 4,580 | 3,590 to 6,485 | |
| May | 5,500 | 3,860 to 8,580 | |
| June | 6,000 | 4,125 to 10,950 | |
| July | 4,010 | 2,840 to 5,230 | |
| August | 3,640 | 2,730 to 4,250 | |
| September | 3,715 | 2,945 to 4,230 | |
| October | 3,480 | 3,090 to 4,230 | |
| November | 3,640 | 3,160 to 4,335 | |
| December | 3,740 | 3,170 to 4,630 |
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 51 years of record. Statistics published by the US Geological Survey for Missouri River bl Hauser Dam near Helena MT (site 06065500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Missouri 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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