RIVER GAUGE · BIG LOST RIVER
Big Lost River at Howell Ranch
Custer County, Idaho
Water level0.96 ft
Flow93 cfs
Last readingSep 16, 2026, 5:00 PM UTC (last recorded)
Action3.51 ft1,608 cfs
Minor flood4.05 ft2,254 cfs
The past week
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What floods at each level
- 4.05 ft
Widespread lowland flooding from Howell Ranch downriver to the top of Mackay Reservoir. Fish Hatchery Road near Donahue Ranch may have water flowing over it. Canals and headgates may have problems.
- 3.51 ft
Near bankfull from Howell Ranch downriver to the top of Mackay Reservoir. Some lowland flooding of fields possible.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| May 24, 1967 | 6.02 ft | 4,420 cfs |
| Jun 25, 1954 | 6 ft | 3,960 cfs |
| Jun 11, 1921 | 5.94 ft | 3,500 cfs |
More on Big Lost River
DownstreamEastern Idaho Reservoirs at Mackay Dam
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