The lake bed in 3-D: deep basin, drop-offs and shoreline. Shape estimated, not for navigation. Spot 1 (back of a cove) is open for everyone; the other 5 come with LakeScope PRO. Full screen
Arrowrock Reservoir
Elmore County, Idaho · 3,100 acres (4.8 sq mi)
55°F water, windy Friday (18 mph SSE).
About Arrowrock Reservoir
In Elmore County, Idaho, Arrowrock Reservoir covers 3,100 acres; it is a reservoir. It was made by Arrowrock Dam on the Boise River. Arrowrock Dam, completed in 1915, was the tallest dam in the world at the time of its construction.
From end to end it runs about 7.1 miles with roughly 33 miles of shoreline. Its surface is about 3,200 ft above sea level. Idaho City lies about 13 miles to the north.
- Size
- 3,100 acres (4.8 sq mi)
- Shoreline
- About 33 miles
- End to end
- About 7.1 miles
- Elevation
- About 3,200 ft
- Type
- Reservoir
- Dam
- Arrowrock Dam, Boise River
- County
- Elmore County
The lake from above
Best fishing times
Friday Fair
- 7:00 am – 8:00 amsunrise
- 3:45 pm – 5:15 pm bestsunset, moon overhead · wind 18 mph
Saturday Good
- 7:00 am – 9:15 amsunrise · wind 7 mph
- 4:00 pm – 6:00 pm bestsunset, moon overhead · wind 3 mph
Based on sun and moon times and the wind forecast. A guide, not a promise. The app shows the whole week.
Fish to expect
For a lake of this size in Idaho, largemouth bass, crappie, bluegill and sunfish and catfish are the fish to expect. The state fish and wildlife agency lists what is stocked and the rules for this lake. With the surface at 55°F, the notes below say which of them should be biting.
- FairLargemouth bass
Cooling down. Try slow baits on points and deeper channel edges.
- FairCrappie
Schooled on deeper brush piles. Fish small jigs slowly.
- FairBluegill and sunfish
Warming. Shallow, sunny pockets in the afternoon.
- FairCatfish
Waking up. Channels and creek mouths, especially after rain.
From today's water temperature and the season. A guide, not a promise.
Fishing spots
- 1Back of a cove
Sheltered, shallower water where baitfish gather.
- 2
- 3
- 4
- 5
- 6
5 more spots with LakeScope PRO: fish, depth band, water temperature, best time and bait for each.
Picked from the shape of the lake bed. A guide, not a promise.
Water temperature
At the surface, seen .
Water level
No daily level reading for this lake.
Ice
Open water
Ice thickness is an estimate from air temperature, not a measurement. Check the ice yourself before going on it.
Weather and wind
Sunrise 7:35 am · sunset 5:19 pm · waxing crescent moon (lake time).
Towns and places to stay near Arrowrock Reservoir
- Idaho Cityabout 13 mi north
- Boiseabout 14 mi west
- Garden Cityabout 16 mi west
- Hidden Springabout 19 mi northwest
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Questions about Arrowrock Reservoir
What fish are in Arrowrock Reservoir?
Lakes like Arrowrock Reservoir usually hold largemouth bass, crappie, bluegill and sunfish and catfish. Check the state fish and wildlife agency for stocking and limits.
How deep is Arrowrock Reservoir?
We have no published depth for this lake. The 3-D view gives an estimated shape of the bed: where the deep basin and the drop-offs are. Not for navigation.
How big is Arrowrock Reservoir?
3,100 acres, with about 33 miles of shoreline.
What town is near Arrowrock Reservoir?
Idaho City is about 13 miles north; Boise is about 14 miles west.
What is the water temperature at Arrowrock Reservoir today?
The surface was about 55°F on the latest clear reading. The page updates every day.
Arrowrock Reservoir on your phone
The whole week of bite times, lake alerts and the 3-D view, every morning.
