RIVER GAUGE · MARIAS RIVER
Marias River near Shelby
Toole County, Montana
Water level3.15 ft
Flow551 cfs
Last readingSep 16, 2026, 4:30 PM UTC (last recorded)
Action8 ft6,313 cfs
Minor flood9 ft8,613 cfs
Moderate flood13 ft23,085 cfs
Major flood15 ft35,486 cfs
The past week
Loading chart…
What floods at each level
- 14.5 ft
Water encroaches onto Interstate 15. Traffic is blocked. Some ranchers and other residents need to prepare for evacuation.
- 11.5 ft
A fairway on golf course floods. Williamson Park almost completely innundated.
- 9 ft
Water floods east and northeast portions of Williamson Park. Low spots on golf course flood.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Jun 8, 1964 | 23.64 ft | 241,000 cfs |
| Jun 19, 1975 | 18.21 ft | 75,700 cfs |
| Jun 17, 1948 | 17.75 ft | 40,000 cfs |
More on Marias River
Get an alert when Marias River rises
Save this gauge in the free StormCast app and pick the level that matters to you. Your phone goes off when the water gets there.
