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American Falls Reservoir water level

Reservoir, Idaho, United States

Directions

Low for mid-October

Surface elevation

4,312.74ft Up 3.24 ft over the last 7 days

Water stored
142,139 acre‑ft
4,310 4,320 4,330

History

4,3104,3204,330ftOct 13Oct 14Oct 15Oct 16Oct 174,3104,3204,330ftOct 13Oct 15Oct 17
4,3104,3204,330ftSep 20Sep 26Oct 3Oct 10Oct 174,3104,3204,330ftSep 20Oct 3Oct 17
4,3204,340ftOct 2025Jan 2026Apr 2026Jul 2026Oct 20264,3204,340ftOct 2025Apr 2026Oct 2026
4,3204,340ftOct 2016Apr 2019Oct 2021Apr 2024Oct 20264,3204,340ftOct 2016Oct 2021Oct 2026
4,3204,340ftJanMarMayJulSepNov20264,3204,340ftJanAprJulOct2026

202120222023202420252026

Surface elevation Normal range (10–90 %)

What this means

American Falls Reservoir is below normal for mid-October, with the lake level at 4,312.74 ft.

That puts it 6.83 ft below the median of 4,319.57 ft for mid-October, based on 36 years of readings. A year ago it stood at 4,313.98 ft (−1.24 ft).

It has risen 3.24 ft over the past week. In the last month it has stayed between 4,307.16 ft and 4,312.74 ft.

Many reservoirs are drawn down through summer and fall; most of the refill comes later, with winter rain or spring snowmelt.

Compared with 36 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date
4,319.57 ft6.83 ft below the median for this date
Normal for this date
4,310.97 ft – 4,334.88 ft8 years in 10 fall in this range (36 years of records)
Same day last year
4,313.98 ft−1.24 ft
Lowest and highest in 30 days
4,307.16 ft – 4,312.74 ft
Lowest and highest in 12 months
4,307.06 ft – 4,349.40 ft

On the water at American Falls Reservoir

A receding shoreline opens up beaches but also uncovers hazards: stumps, rocks and soft mud that are usually well under water.

Wear a life jacket on the water. Most boating deaths involve people who were not wearing one.

Weather at the gauge

No rain in the last 3 days.

18 Sun 64° 37° – Wind 11 mph
19 Mon 70° 39° – Wind 16 mph
20 Tue 70° 48° – Wind 14 mph
21 Wed 72° 49° 0.01 in Wind 12 mph
22 Thu 73° 53° 0.07 in, 72% Wind 24 mph
23 Fri 57° 48° 0.72 in, 80% Wind 10 mph
24 Sat 57° 43° – Wind 10 mph

Forecast: Open-Meteo

Sunrise 07:50 AM Sunset 06:44 PM Daylight 10 hr, 54 min First quarter 56%

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Snake River at NeeleyRiver gauge, Snake River 2.01 ft Below flood stage −0.01 ft 0.8 mi
Portneuf River near TyheeRiver gauge, Portneuf River 4.60 ft Below flood stage −0.02 ft 20 mi
Portneuf River at PocatelloRiver gauge, Portneuf River 3.73 ft Below flood stage +0.02 ft 22 mi
Spring Creek at Sheepskin Road near Fort HallRiver gauge, Spring Creek 228 cfs Very low +2.0 cfs 25 mi
Snake River near BlackfootRiver gauge, Snake River 3.04 ft Below flood stage −0.14 ft 30 mi
Lake WalcottLake 4,237.57 ft Very low 32 mi
Blackfoot River and Bypass Channel near BlackfootRiver gauge, Blackfoot River and Bypass Channel 163 cfs Low −4.0 cfs 32 mi
Blackfoot River near BlackfootRiver gauge, Blackfoot River 3.10 ft Below flood stage −0.02 ft 32 mi

Questions and answers

How does American Falls Reservoir compare with last year?

It is 1.24 ft lower than on the same day last year, when the reading was 4,313.98 ft.

What is a normal level for American Falls Reservoir in mid-October?

The median for mid-October is 4,319.57 ft. In 8 years out of 10 the reading falls between 4,310.97 ft and 4,334.88 ft, based on 36 years of records.

Is American Falls Reservoir really 4,312.74 ft deep?

No. 4,312.74 ft is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of American Falls Reservoir today?

On Oct 17, 2026, the surface elevation was 4,312.74 ft. Up 3.24 ft over the last 7 days.

Is American Falls Reservoir rising or falling?

Up 3.24 ft over the last 7 days.

Is the level of American Falls Reservoir normal?

Low for mid-October. Compared with 36 years of daily readings for this time of year.

How often is this data updated?

The U.S. Bureau of Reclamation publishes a new reading once a day. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
U.S. Bureau of Reclamation
Station code
usbr:7167 (Agency page)
Coordinates
42.77916, -112.87917 (WGS84)
Update interval
once a day
Licence
Public domain. Data: U.S. Bureau of Reclamation (RISE), provisional data subject to revision

Published series

ParameterLast valueTime (UTC)Quality
Surface elevation 4,312.74 ft 2026-10-17 06:00 Provisional
Water stored 142,139 acre‑ft 2026-10-17 06:00 Provisional

Download

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How to cite

U.S. Bureau of Reclamation: American Falls Reservoir (usbr:7167). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/idaho/american-falls-reservoir

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer