RIVER GAUGE · EASTERN IDAHO RESERVOIRS
Eastern Idaho Reservoirs at Mackay Dam
Custer County, Idaho
Water level26.74 ft
Flow87,500 cfs
Last readingSep 16, 2026, 2:45 PM UTC (last recorded)
Action65.7 ft
The past week
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What floods at each level
- 66.5 ft
102 percent Full Maximum Level
- 65.7 ft
100 percent Full
- 64.8 ft
97 percent Full
- 64.2 ft
95 percent Full
- 63.2 ft
92 percent Full
- 61.5 ft
90 percent Full
- 60.8 ft
87 percent Full
- 59.6 ft
80 percent Full
- 55.9 ft
70 percent Full
- 51.9 ft
60 percent Full
- 47.5 ft
50 percent Full
- 42.5 ft
40 percent Full
- 36.8 ft
30 percent Full
- 30.2 ft
20 percent Full
- 21.6 ft
10 percent Full
More on Eastern Idaho Reservoirs
UpstreamBig Lost River at Howell Ranch
DownstreamBig Lost River below Mackay Reservoir
Eastern Idaho Reservoirs at American Falls
Eastern Idaho Reservoirs at Henrys Lake
Eastern Idaho Reservoirs at Island Park
Eastern Idaho Reservoirs at Little Wood Reservoir
Eastern Idaho Reservoirs at Magic Dam
Eastern Idaho Reservoirs at Minidoka Dam
Eastern Idaho Reservoirs at Palisades
Eastern Idaho Reservoirs at Ririe Dam
Get an alert when Eastern Idaho Reservoirs rises
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