Is the Big Lost River flooding?
The Big Lost River is tracked by 9 USGS streamgauges in Idaho. This page compares each gauge’s live water level against its official National Weather Service flood stage, refreshed every 15 minutes, so you can tell whether the Big Lost River is running normal, rising toward flood stage, or already flooding. 3 of 9 gauges have both a usable water-level reading and a published minor flood stage. Gauges without a published flood stage show water level and flow only. For nearby rivers, see all Idaho river levels.
River facts
The longest-running gauge on this river is Big Lost River below Mackay Reservoir near Mackay ID. The highest level ever recorded there was 6.08 ft on 6 June 1986, carrying 2,990 cfs. Peak records there go back to 1904 (112 annual peaks). It is currently at 2.30 ft, 3.8 ft below that record.
| Gauge | Status | Stage | Flood stage | Updated |
|---|---|---|---|---|
| Big Lost River at Howell Ranch near Chilly ID | No flooding | 0.98 ft | 4.05 ft | |
| Big Lost River below Mackay Reservoir near Mackay ID | No flooding | 2.30 ft | 4.3 ft | |
| Big Lost River near Arco ID | No flooding | 2.01 ft | 6.5 ft | |
| Big Lost River below Inl Div near Arco ID | No current data | — | — | — |
| Big Lost River at Lincoln Blvd Bridge near Atomic City | No current data | — | 14.75 ft | — |
| Big Lost River above Big Lost River Sinks near Howe ID | No current data | — | — | — |
| Big Lost River near Leslie ID | No flood stage defined | 5.38 ft | — | |
| Big Lost River below Moore Div near Moore ID | No flood stage defined | 9.39 ft | — | |
| Big Lost River at Arco at Sunset Road ID | No flood stage defined | 5.08 ft | — |