Big Lost River near Arco, ID
River level and flood forecast · Butte County
The river is 4.5 ft below flood stage (6.5 ft).
Flow: 0 cubic feet per second (USGS).
River camera
Watch the time-lapse
Camera by the U.S. Geological Survey. Most take a picture every hour, some every few minutes; many stop at night.
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 5 PM. Forecasts change as rain falls and as upstream water arrives.
Get flood alerts for this river
An email when the National Weather Service forecasts Big Lost River near Arco to flood, when it floods, and when it's over.
Flood stages
| Flood stage | 6.5 ft |
| Action stage | 5.5 ft |
| Record crest (July 5, 1967) | 7.68 ft |
What floods at each level
From the National Weather Service, highest first.
- 6.5 ftWidespread 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 ftBig 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
- 7.68 ft — July 5, 1967
- 7.32 ft — July 12, 1983
- 7.26 ft — June 9, 1986
- 7.1 ft — June 14, 1997
- 6.86 ft — July 2, 1982
Recent crests: 5 ft (June 21, 2019) · 5.7 ft (June 3, 2018) · 5.87 ft (June 23, 2017) · 1.99 ft (June 1, 2016) · 1.99 ft (June 1, 2015)
Up and down the river, and nearby
- UpstreamBig Lost River below Mackay Reservoir, ID
- Antelope Creek (ID) near Darlington, ID
- Big Lost River at Leslie, ID
- Little Lost River near Howe, ID
- Eastern Idaho Reservoirs at Mackay Dam, ID
- Little Lost River below Wet Creek (Clyde), ID
- Little Wood River near Carey, ID
- Little Wood River above High 5 Creek, ID
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (ARCI1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.