RIVER GAUGE · BIG LOST RIVER
Big Lost River near Arco
Butte County, Idaho
Water level2.01 ft
Flow—
Last readingSep 16, 2026, 5:00 PM UTC (last recorded)
Action5.5 ft672 cfs
Minor flood6.5 ft1,280 cfs
The past week
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What floods at each level
- 6.5 ft
Widespread lowland flooding probable from Darlington/Moore areas downriver to the INL Complex boundary. Bank erosion possible. Bridges along US HWY 93 may have water near their base.
- 5.5 ft
Big Lost River within 1 foot of bankfull in many locations between Darlington/Moore areas to the INL Complex boundary. Some minor lowland flooding and ponding of water may occur. Isolated erosion possible along James Creek south of the Moore bridge.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Jul 4, 1967 | 7.68 ft | 1,890 cfs |
| Jul 11, 1983 | 7.32 ft | 1,820 cfs |
| Jun 8, 1986 | 7.26 ft | 1,860 cfs |
More on Big Lost River
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