Around here
Around Saint Mary River
Before you go
Data Source: Recreation.gov · Source: USGS GNIS · Source: National Park Service. No claim to original U.S. Government works. · Public land: USGS PAD-US · Forest roads: USDA Forest Service MVUM · BLM routes and areas: Bureau of Land Management (simplified for web display)
About this river
Saint Mary River is a 39.0 mile river near Many Glacier Horse Stable in Montana. Streamflow is measured at the USGS gauge St. Mary River near Babb MT (site 05017500). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1951 to 2026
Saint Mary River typically runs highest in June, at a median 2,160 cfs, and lowest in February, at 88 cfs. The highest flow on record for any single day is 15,600 cfs, in 1964.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 99 | 75 to 135 |
| February | 88 | 69 to 127 |
| March | 107 | 76 to 200 |
| April | 481 | 196 to 767 |
| May | 1,440 | 1,080 to 1,970 |
| June | 2,160 | 1,750 to 2,850 |
| July | 1,430 | 1,210 to 1,870 |
| August | 1,010 | 878 to 1,110 |
| September | 684 | 344 to 870 |
| October | 244 | 139 to 430 |
| November | 196 | 121 to 315 |
| December | 112 | 83 to 194 |
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 75 years of record. Statistics published by the US Geological Survey for St. Mary River near Babb MT (site 05017500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
2 mapped launches sit in the mapped area of Saint Mary River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
- Rising SunSaint Mary LakePublic
- Chewing Black BonesLower Saint Mary LakePublic
Made to print
Put Saint Mary River on your wall
This river section as an art print, drawn over the real terrain with its miles, plus the trails, roads and peaks around it. Pick the colors and the size, and see the finished print before you buy. From $39, shipping included.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Saint Mary 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.
