American Falls Reservoir Water Level Today
Daily level, distance to full pool and history for American Falls Reservoir, on the Snake River in Idaho.
Updated · Source: Bureau of ReclamationReclamation
Water level
4,320.92ft
- 33.58 ftbelow full pool (4,354.5 ft)
- +0.38 ftin 24 h+2.72 ft in 7 days+11.68 ft in 30 days
- Full pool
- 1 yr ago
Is American Falls Reservoir full?
No. American Falls Reservoir is 33.58 ft below full pool (4,354.5 ft). It is 0.60 ft lower than a year ago (4,321.52 ft on Nov 7, 2025).
American Falls Reservoir level history
View data table
| Date | Level (ft) | % full |
|---|---|---|
| Nov 7, 2026 | 4,320.92 | — |
| Nov 6, 2026 | 4,320.54 | — |
| Nov 5, 2026 | 4,320.16 | — |
| Nov 4, 2026 | 4,319.82 | — |
| Nov 3, 2026 | 4,319.46 | — |
| Nov 2, 2026 | 4,319.04 | — |
| Nov 1, 2026 | 4,318.59 | — |
| Oct 31, 2026 | 4,318.20 | — |
| Oct 30, 2026 | 4,317.87 | — |
| Oct 29, 2026 | 4,317.53 | — |
| Oct 28, 2026 | 4,317.19 | — |
| Oct 27, 2026 | 4,316.80 | — |
| Oct 26, 2026 | 4,316.41 | — |
| Oct 25, 2026 | 4,316.09 | — |
| Oct 24, 2026 | 4,315.74 | — |
| Oct 23, 2026 | 4,315.29 | — |
| Oct 22, 2026 | 4,314.88 | — |
| Oct 21, 2026 | 4,314.54 | — |
| Oct 20, 2026 | 4,314.12 | — |
| Oct 19, 2026 | 4,313.70 | — |
| Oct 18, 2026 | 4,313.23 | — |
| Oct 17, 2026 | 4,312.74 | — |
| Oct 16, 2026 | 4,312.24 | — |
| Oct 15, 2026 | 4,311.74 | — |
| Oct 14, 2026 | 4,311.23 | — |
| Oct 13, 2026 | 4,310.83 | — |
| Oct 12, 2026 | 4,310.45 | — |
| Oct 11, 2026 | 4,309.97 | — |
| Oct 10, 2026 | 4,309.50 | — |
| Oct 9, 2026 | 4,309.36 | — |
| Oct 8, 2026 | 4,309.24 | — |
Full pool 4,354.5 ftLow 4,307.06 ft · Sep 13High 4,349.40 ft · Apr 6
View data table
| Month | Low (ft) | High (ft) |
|---|---|---|
| Nov 2026 | 4,318.59 | 4,320.92 |
| Oct 2026 | 4,309.18 | 4,318.20 |
| Sep 2026 | 4,307.06 | 4,310.90 |
| Aug 2026 | 4,311.45 | 4,320.25 |
| Jul 2026 | 4,322.04 | 4,329.40 |
| Jun 2026 | 4,330.08 | 4,339.17 |
| May 2026 | 4,339.52 | 4,347.65 |
| Apr 2026 | 4,347.87 | 4,349.40 |
| Mar 2026 | 4,345.69 | 4,349.06 |
| Feb 2026 | 4,341.58 | 4,345.41 |
| Jan 2026 | 4,335.60 | 4,341.23 |
| Dec 2025 | 4,328.23 | 4,335.02 |
| Nov 2025 | 4,321.52 | 4,327.51 |
Full pool 4,354.5 ft
View data table
| Year | Low (ft) | High (ft) |
|---|---|---|
| 2026 | 4,307.16 | 4,349.40 |
| 2025 | 4,306.62 | 4,354.23 |
| 2024 | 4,318.55 | 4,354.52 |
| 2023 | 4,320.27 | 4,352.61 |
| 2022 | 4,307.07 | 4,350.46 |
| 2021 | 4,310.41 | 4,353.44 |
| 2020 | 4,323.77 | 4,354.61 |
| 2019 | 4,319.42 | 4,354.72 |
| 2018 | 4,321.31 | 4,354.65 |
| 2017 | 4,336.07 | 4,354.65 |
| 2016 | 4,325.29 | 4,337.68 |
Full pool 4,354.5 ftHighest 4,355.75 ft · Jun 20, 1963Lowest 4,295.60 ft · Sep 29, 1977
View data table
| Decade | Low (ft) | High (ft) |
|---|---|---|
| 2020s | 4,307.12 | 4,354.62 |
| 2010s | 4,307.55 | 4,354.65 |
| 2000s | 4,304.54 | 4,354.53 |
| 1990s | 4,297.15 | 4,355.07 |
| 1980s | 4,304.43 | 4,355.58 |
| 1970s | 4,295.60 | 4,354.93 |
| 1960s | 4,296.74 | 4,355.52 |
| 1950s | 4,307.07 | 4,355.38 |
- American Falls Reservoir level
- Full pool 4,354.5 ft
- Above full pool
American Falls Reservoir on Nov 7 in past years
Lake facts
- Highest since 1950
- 4,355.75 ftJun 20, 1963
- Lowest since 1950
- 4,295.60 ftSep 29, 1977
- Data since
- Jan 1, 1950
- Dam
- American Falls Damcompleted 1927
- River
- Snake River
- Owned by
- Bureau of Reclamation
- Dam location
- Power County
- Gauge location
- 42.7792, −112.8792
Dam, river and owner from the National Inventory of Dams (USACE). Records cover Jan 1, 1950 to today (daily averages).
Weather on the lake
- This Afternoon59°FHighLow 39°FS 7 mphMostly Cloudy
- Tonight39°FLowSE 7–12 mphMostly Cloudy
- Monday61°FHighLow 41°FESE 3–7 mphPartly Sunny
- Tuesday57°FHighLow 37°FWSW 6–14 mphSunny
- Wednesday57°FHighLow 37°FENE 7 mphSunny
- Thursday59°FHighLow 39°FENE 6–9 mphMostly Sunny
- Friday59°FHighLow 40°FSE 9 mphMostly Sunny
Forecast: National Weather Service for the dam area (42.78, −112.88). Wind speeds are forecasts, not measurements.
Nearby lakes
Quick answers
What is the full pool level of American Falls Reservoir?
4,354.5 ft above mean sea level, the top of its conservation pool. Above it, water is released or flows over the spillway of American Falls Dam.
How much does American Falls Reservoir need to be full?
American Falls Reservoir needs 33.58 ft more water to reach full pool (4,354.5 ft), as of Nov 7, 2026.
Is American Falls Reservoir rising or falling?
It is rising: +2.72 ft in the last 7 days and +0.38 ft in 24 hours, to 4,320.92 ft on Nov 7, 2026 (Bureau of Reclamation).
When was American Falls Reservoir last full?
It was last at or above full pool (4,354.5 ft) on May 27, 2024. On Nov 7, 2026 it was 33.58 ft below.
What is the highest level in our data?
American Falls Reservoir reached 4,355.75 ft on Jun 20, 1963. The lowest was 4,295.60 ft on Sep 29, 1977 (Reclamation data since 1950; older records are not in this data set).
How much has American Falls Reservoir changed in the last year?
In the last 12 months it ranged from 4,307.06 ft (Sep 13, 2026) to 4,349.40 ft (Apr 6, 2026), a swing of 42.34 ft.
How often is this page updated?
This page is updated every day with the daily reading of the Bureau of Reclamation, which is usually published one or two days later. The last reading is from Nov 7, 2026.
Where this data comes from
Daily elevation from the Bureau of Reclamation (data.usbr.gov). Updated once a day. Weather from the National Weather Service. Dam details from the National Inventory of Dams.
Lake Levels Daily is an independent site, not affiliated with TWDB, LCRA, USACE, USGS, NOAA, TVA or any lake operator. Check official sources before making safety decisions.