IdahoReservoir, 1,178 acres, Custer County
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23.38ft
Up 2.71 ft this week
Sailing
CheckingReading the forecast
Kayak and SUP
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Power boating
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Fishing
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Outlook. Monday: SE wind 7 to 14 kt, gusts to 18 kt, high near 47°F, 59% chance of rain. Tuesday: W wind 4 to 9 kt, gusts to 12 kt, high near 41°F.
7-day wind forecastLoads when you scroll here
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Last hour of NOAA MRMS radar, 1 km resolution. Map data © OpenStreetMap contributors, OpenMapTiles, OpenFreeMap.
23.38ft (gage datum)
+2.71 ft in 7 days11.32 ft below the October normal
Reading from Oct 26, 2026. Shaded band: range of October averages on record; dashed line is the typical level.
Mackay Reservoir was at 23.38 ft on the gage on October 26, rising 2.71 ft over the past week. That is below normal for October: the typical October level is 34.70 ft, so the lake is 11.32 ft below its usual mark.
Background reading: Mackay Reservoir on Wikipedia
Mackay Reservoir is a 1,178-acre reservoir in Custer County, Idaho. The water surface sits about 6,060 ft above sea level.
Water level on this page comes from USGS gauge 13126000 (Mackay Reservoir near Mackay ID). Wind, gusts and rain come from the National Weather Service forecast grid that covers the water.
Mid-sized lakes like this one tend to have shifty, gusty wind near shore and steadier pressure in the middle, which is why gust spread matters as much as average speed. At about 6,060 ft, summer afternoons often bring building wind and quick thunderstorms, and the water stays cold well into the season. Reservoir levels move with releases and inflow, so ramps and beaches can change week to week. The water level page tracks that day by day.
The go or no-go calls above are a starting point, not a guarantee. Read how we score conditions, and always check local rules and posted warnings before you launch.
The National Weather Service forecast for the lake from October 26: Monday: SE wind 7 to 14 kt, gusts to 18 kt, high near 47°F, 59% chance of rain. The panel at the top of this page refreshes the current wind, gusts and direction when you open it and turns them into a call for sailing, paddling, power boating and fishing.
Mackay Reservoir was at 23.38 ft on the gage on October 26, rising 2.71 ft over the past week. That is below normal for October: the typical October level is 34.70 ft, so the lake is 11.32 ft below its usual mark.
Mackay Reservoir covers about 1,178 acres (1.8 square miles) of surface water.
If Mackay is blown out, these are the closest alternatives. Tap through for their conditions.