Water level
3,135.49ft above sea level
+3.64 ft in 7 daysOct 12Oct 19Oct 26
Sep 26Oct 11Oct 26
Reading from Oct 26, 2026.
Arrowrock Reservoir was at 3,135.49 ft on October 26, rising 3.64 ft over the past week.
IdahoReservoir, 2,288 acres, Boise County, Elmore County
Arrowrock Reservoir conditions today
Right now on Arrowrock
loading
Best window
0pm to 0pm
score
Wind
00kt
Gusts 00
Direction
NE
Blowing from
Air temp
00°F
High
Rain
Dry%
next 6 hours
Water level
3,135.49ft
Up 3.64 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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Hour by hour
Next 24 hours
Wind and gusts0 to 30+ ktScoreGood, caution, stay ashoreNightBest windowArrows point where the wind blows to.
Outlook. Monday: SSW wind 3 to 13 kt, gusts to 18 kt, high near 58°F, thunderstorms possible. Tuesday: SW wind 3 to 6 kt, gusts to 8 kt, high near 50°F.
7-day wind forecastLive radar
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LightHeavy
Last hour of NOAA MRMS radar, 1 km resolution. Map data © OpenStreetMap contributors, OpenMapTiles, OpenFreeMap.
Lake facts
- Type
- Reservoir
- State
- Idaho
- County
- Boise County, Elmore County
- Surface area
- 2,288 acres
- Elevation
- 3,219 ft
- Level source
- U.S. Army Corps of Engineers, Arrowrock Dam
- Coordinates
- 43.6072° N, 115.8376° W
About Arrowrock Reservoir
Set in Boise County, Elmore County, Idaho, Arrowrock Reservoir is a 2,288-acre reservoir. The water surface sits about 3,219 ft above sea level.
Water level on this page comes from the U.S. Army Corps of Engineers reading at Arrowrock Dam, published through the Corps' CWMS data service. 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. 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.
Arrowrock Reservoir questions
Is it windy on Arrowrock Reservoir today?
The National Weather Service forecast for the lake from October 26: Monday: SSW wind 3 to 13 kt, gusts to 18 kt, high near 58°F, thunderstorms possible. 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.
What is the water level at Arrowrock Reservoir right now?
Arrowrock Reservoir was at 3,135.49 ft on October 26, rising 3.64 ft over the past week.
How big is Arrowrock Reservoir?
Arrowrock Reservoir covers about 2,288 acres (3.6 square miles) of surface water.
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