American Falls Reservoir lake and shoreline

American Falls Reservoir Water Level

Idaho

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American Falls Reservoir is currently 47.4 feet below full pool, with a water-surface elevation of 4307.6 feet.

4307.55 ft · Updated 1 day ago · U.S. Bureau of Reclamation (USBR)

Current level

4,307.55ft

−47.45 ft vs full pool

Low

Vs full pool

Since last reading

Down 0.23 ft

Previous readingSep 84,307.78 ft

7-day change

Down 0.84 ft

7-day trend: Falling

4 daily readings in the last 7 days

30-day change

Down 0.84 ft

4 daily readings in the last 30 days

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Water Level History

Elevation (ft) NGVD29 · MSL

4313 ft4331 ft4349 ftFULL POOL 4355.00 ftSep 7Sep 10

Level status

47.45 ft below full pool

Current level
4,307.55 ft
Full pool
4,355 ft
DatumElevation referenced to National Geodetic Vertical Datum of 1929.
NGVD29
Elevation reference
MSL
Source
U.S. Bureau of Reclamation (USBR)

Reference levels

  • Full pool4,355 ft

Watershed drought

Extreme Drought

100% of watershed in official drought (D1+).

Severity

NoneExtreme
Trend
Stable

Watershed drought conditions

Power County, ID

Extreme Drought

Extreme Drought. Extreme drought conditions are present.. Trend: Stable compared with last week. Official drought yes

Severity

NoneExtreme

Weekly trend

Stable

Compared with last week

Official drought

Yes

100% of the watershed is currently classified as official drought (D1+).

Expected impacts

  • Significantly reduced stream inflows
  • Lake levels may fall quickly without heavy rain
  • Dry vegetation and elevated wildfire risk
  • Water use restrictions may apply nearby

U.S. Drought Monitor · map date Sep 8, 2026. Updated weekly. droughtmonitor.unl.eduView drought map for Power County, ID

Daily level summary

  • Sep 9, 2026

    4,307.55 ft

    -0.23 ft

  • Sep 8, 2026

    4,307.78 ft

    -0.24 ft

  • Sep 7, 2026

    4,308.02 ft

    -0.37 ft

  • Sep 6, 2026

    4,308.39 ft

    —

Common questions about American Falls Reservoir’s water level

  • The current water level at American Falls Reservoir is 4,307.55 ft (updated 1 day ago). You can track the American Falls Reservoir lake level on the interactive chart and daily history above.

  • Full pool for American Falls Reservoir is 4,355 ft — the normal conservation target elevation when the reservoir is at its designed summer or operating pool.

  • The current 7-day trend for the American Falls Reservoir lake level is falling — falling about 0.84 ft over the past week. See the history chart above for the full picture.

  • Based on the latest gauge reading, American Falls Reservoir is currently 47.45 ft below full pool.

Lake level glossary

Definitions for pool targets, datums, and how elevation readings are labeled.

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