Eastern Idaho Reservoirs at Mackay Dam, ID
River level and flood forecast · Custer County
Normal19.3 ftas of Mon 9 PM
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 Eastern Idaho Reservoirs at Mackay Dam to flood, when it floods, and when it's over.
Flood stages
| Action stage | 65.7 ft |
What floods at each level
From the National Weather Service, highest first.
- 66.5 ft102 percent Full Maximum Level
- 65.7 ft100 percent Full
- 64.8 ft97 percent Full
- 64.2 ft95 percent Full
- 63.2 ft92 percent Full
- 61.5 ft90 percent Full
- 60.8 ft87 percent Full
- 59.6 ft80 percent Full
- 55.9 ft70 percent Full
- 51.9 ft60 percent Full
- 47.5 ft50 percent Full
- 42.5 ft40 percent Full
- 36.8 ft30 percent Full
- 30.2 ft20 percent Full
- 21.6 ft10 percent Full
Up and down the river, and nearby
- UpstreamBig Lost River at Howell Ranch, ID
- DownstreamBig Lost River below Mackay Reservoir, ID
- Big Lost River at Leslie, ID
- Antelope Creek (ID) near Darlington, ID
- North Fork Big Lost River at Wild Horse, ID
- Little Lost River below Wet Creek (Clyde), ID
- Little Lost River near Howe, ID
- Big Lost River near Arco, ID
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MACI1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.