Arrowrock Reservoir

Name: Arrowrock Reservoir (Idaho) water level
Creator: U.S. Bureau of Reclamation

Idaho · Reclamation gauge

Grey bar: 12-month range 3,110.8–3,215.1 ft.

Water level · NGVD29

3,134.61FT

Storage 83,628 acre-feet

The source publishes no % full figure.

7 days +3.69 ft30 days +3.79 ft

Reading for Oct 24, 2026 · page refreshed Oct 25, 21:16 UTC
Source: U.S. Bureau of Reclamation (RISE)

Worth going today?This Afternoon

Looks good

Light wind, dry

Wind6 mph

Rain1%

Temp64°F

Level3,134.6 ft

This AfternoonMostly Sunny · 64°F
SE 6 mph · rain 1%

TonightMostly Cloudy · 39°F
SE 5 to 8 mph · rain 10%

NWS forecast for the gauge location. Good = wind ≤ 10 mph and rain ≤ 30%; storms are flagged. Not safety advice – check local conditions, closures and warnings.

Level history

30 days1 year

Field notes

Arrowrock Reservoir's latest daily level (Oct 24, 2026) is 3,134.61 (NGVD29) ft.

Reclamation reports storage of 83,628 acre-feet for the same day.

Over the past 7 days the lake has been rising (+3.69 ft), and it is +3.79 ft over 30 days.

Readings come from the Bureau of Reclamation's daily reservoir data for Arrowrock Reservoir and Dam (ARK).

Lake facts

Storage (latest)	83,628 acre-feet
Gauge / station	Arrowrock Reservoir and Dam (ARK)
Elevation datum	ft (NGVD29)
Gauge location	43.5952, -115.9230

Nearby lakes

Lucky Peak Lake8 mi SW2,946.04 ft+0.80 ft Anderson Ranch Reservoir29 mi SE4,150.32 ft−0.29 ft Black Canyon Reservoir35 mi NW2,487.94 ft−3.43 ft Lake Lowell41 mi W2,525.57 ft−0.08 ft Deadwood Reservoir50 mi N5,304.01 ft+0.43 ft

Common questions

Is Arrowrock Reservoir rising or falling?

Over the last 7 days it changed +3.69 ft and over 30 days +3.79 ft.

How full is Arrowrock Reservoir?

Reclamation publishes the water surface elevation for this gauge but not a percent-full figure, so we don't show one rather than estimate it.

How often is this page updated?

The page is rebuilt automatically every day from Reclamation's published data. Values can be revised later by the source agency.

Where does the data come from?

The U.S. Bureau of Reclamation's RISE data portal (data.usbr.gov). Forecasts come from the National Weather Service.

Daily values published by the Bureau of Reclamation. Reclamation data are provisional and subject to revision unless otherwise noted. This page is not affiliated with or endorsed by the Bureau of Reclamation. See data sources.