About this river
Marias River is a 12.9 mile river near Missouri River Outfitters in Montana. Streamflow is measured at the USGS gauge Marias River near Loma MT (site 06102050). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1960 to 2026
Marias River typically runs highest in June, at a median 980 cfs, and lowest in January, at 290 cfs. The highest flow on record for any single day is 10,300 cfs, in 1964.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 290 | 170 to 390 | |
| February | 340 | 240 to 630 | |
| March | 380 | 211 to 725 | |
| April | 552 | 481 to 943 | |
| May | 920 | 494 to 1,420 | |
| June | 980 | 531 to 1,965 | |
| July | 678 | 486 to 1,420 | |
| August | 618 | 470 to 1,040 | |
| September | 571 | 456 to 952 | |
| October | 514 | 454 to 867 | |
| November | 543 | 397 to 1,030 | |
| December | 390 | 177 to 520 |
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 37 years of record. Statistics published by the US Geological Survey for Marias River near Loma MT (site 06102050). 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 Marias River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
