Arrowrock Lake Water Level Today
Idaho · near Boise · Well below full pool
- Elevation
- 3,129.91 ft
- From full pool
- −85.84 ft
- Percent of pool
- n/a
- 24-hour change
- +0.23 ft
- 7-day change
- +2.01 ft
- Reading
- Sep 21, 2026 · USACE
Last year at Arrowrock Lake
Arrowrock Lake is 85.84 ft below full pool, at 3,129.91 ft, up 0.23 ft in the last 24 hours. The top of the flood pool is 89.8 ft higher, at 3,219.75 ft.
Over the last 7 days the level rose 2.01 ft, and over 30 days it rose 17.07 ft. In the 391 days of readings on this page the high was 3,215.06 ft on Apr 18, 2026 and the low was 3,110.43 ft on Aug 20, 2025, a range of 104.63 ft.
The reading is the U.S. Army Corps of Engineers gauge at Arrowrock Dam, near Boise, taken Sep 21, 2026 and referenced to the NGVD29 datum. This page is rebuilt once a day from the agency feed; it is not a live gauge, so during a fast rise or a scheduled release check the USACE page for hourly values.
Arrowrock Lake pool elevations
| Current elevation | 3,129.91 ft |
|---|---|
| Full pool (top of conservation) | 3,215.75 ft |
| Top of flood pool | 3,219.75 ft |
| Top of dam | 3,219.75 ft |
| Inflow | 739 cfs |
| Outflow | 629 cfs |
| 30-day change | +17.07 ft |
| 1-year high | 3,215.06 ft (Apr 18, 2026) |
| 1-year low | 3,110.43 ft (Aug 20, 2025) |
| Vertical datum | NGVD29 |
| Operating agency | U.S. Army Corps of Engineers, NWW district |
Source: U.S. Army Corps of Engineers. Read what full pool and flood pool mean.
More lakes in Idaho
- Lucky Peak Lake 2,960.65 ft, −94.35 ft from full
- Dworshak Reservoir 1,520.63 ft, −79.37 ft from full
- Anderson Ranch Lake 4,152.42 ft, −41.58 ft from full
- Lake Pend Oreille 2,062.30 ft, −0.20 ft from full
- Little Wood Reservoir 5,183.68 ft, −48.32 ft from full
- Palisades Lake 5,520.85 ft, −98.15 ft from full
Arrowrock Lake level questions
What is the water level of Arrowrock Lake today?
Arrowrock Lake is at 3,129.91 ft as of Sep 21, 2026, −85.84 ft relative to full pool (3,215.75 ft). The 24-hour change is +0.23 ft.
What is full pool at Arrowrock Lake?
Full pool, the top of the conservation pool, is 3,215.75 ft (NGVD29). Above that, water is stored temporarily in the flood pool up to 3,219.75 ft.
Is Arrowrock Lake rising or falling?
Over the last 24 hours the level is +0.23 ft; over 7 days it rose 2.01 ft, and over 30 days it rose 17.07 ft.
Where does this Arrowrock Lake level come from?
From the U.S. Army Corps of Engineers (USACE) public data feed for Arrowrock Dam. Lake Levels Today republishes the agency's daily value without adjustment and links to the source below.