Anderson Ranch Lake Water Level Today
Idaho · near Boise · Below full pool
- Elevation
- 4,152.42 ft
- From full pool
- −41.58 ft
- Percent of pool
- 73.1%
- 24-hour change
- −0.05 ft
- 7-day change
- −0.57 ft
- Reading
- Sep 21, 2026 · USACE
Last year at Anderson Ranch Lake
Anderson Ranch Lake is 41.58 ft below full pool, at 4,152.42 ft, down 0.05 ft in the last 24 hours. That puts the lake at 73.1 percent of its conservation pool. The top of the flood pool is 45.7 ft higher, at 4,198.10 ft.
Over the last 7 days the level fell 0.57 ft, and over 30 days it fell 7.26 ft. In the 396 days of readings on this page the high was 4,195.86 ft on May 16, 2026 and the low was 4,152.42 ft on Sep 21, 2026, a range of 43.44 ft.
The reading is the U.S. Army Corps of Engineers gauge at Anderson Ranch Dam nr Mtn Home, 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.
Anderson Ranch Lake pool elevations
| Current elevation | 4,152.42 ft |
|---|---|
| Full pool (top of conservation) | 4,194.00 ft |
| Top of flood pool | 4,198.10 ft |
| Bottom of conservation pool | 4,039.60 ft |
| Top of dam | 4,206.00 ft |
| Inflow | 211 cfs |
| Outflow | 300 cfs |
| 30-day change | −7.26 ft |
| 1-year high | 4,195.86 ft (May 16, 2026) |
| 1-year low | 4,152.42 ft (Sep 21, 2026) |
| 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
- Arrowrock Lake 3,129.91 ft, −85.84 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
Anderson Ranch Lake level questions
What is the water level of Anderson Ranch Lake today?
Anderson Ranch Lake is at 4,152.42 ft as of Sep 21, 2026, −41.58 ft relative to full pool (4,194.00 ft). The 24-hour change is −0.05 ft.
What is full pool at Anderson Ranch Lake?
Full pool, the top of the conservation pool, is 4,194.00 ft (NGVD29). Above that, water is stored temporarily in the flood pool up to 4,198.10 ft. The bottom of the conservation pool is 4,039.60 ft.
Is Anderson Ranch Lake rising or falling?
Over the last 24 hours the level is −0.05 ft; over 7 days it fell 0.57 ft, and over 30 days it fell 7.26 ft.
Where does this Anderson Ranch Lake level come from?
From the U.S. Army Corps of Engineers (USACE) public data feed for Anderson Ranch Dam nr Mtn Home. Lake Levels Today republishes the agency's daily value without adjustment and links to the source below.