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Island Park Reservoir water level

Reservoir, Idaho, United States

Directions

Low for mid-October

Surface elevation

6,281.48ft Up 2.02 ft over the last 7 days

Water stored
28,849 acre‑ft
6,280 6,290 6,300

History

6,2806,2906,300ftOct 13Oct 14Oct 15Oct 16Oct 176,2806,2906,300ftOct 13Oct 15Oct 17
6,2806,2906,300ftSep 20Sep 26Oct 3Oct 10Oct 176,2806,2906,300ftSep 20Oct 3Oct 17
6,2806,2906,300ftOct 2025Jan 2026Apr 2026Jul 2026Oct 20266,2806,2906,300ftOct 2025Apr 2026Oct 2026
6,2706,2806,2906,300ftOct 2016Apr 2019Oct 2021Apr 2024Oct 20266,2706,2806,2906,300ftOct 2016Oct 2021Oct 2026
6,2706,2806,2906,300ftJanMarMayJulSepNov20266,2706,2806,2906,300ftJanAprJulOct2026

202120222023202420252026

Surface elevation Normal range (10–90 %)

What this means

Water is short at Island Park Reservoir: the latest reading of 6,281.48 ft is below normal for mid-October.

The median for mid-October is 6,293.87 ft, based on 36 years of readings, so the lake level is 12.39 ft below typical. On the same day last year the reading was 6,289.89 ft, a difference of −8.41 ft.

It is on the way up, by 2.02 ft over the past week. The 30-day range is 6,274.04 ft – 6,281.48 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
6,293.87 ft12.39 ft below the median for this date
Normal for this date
6,280.23 ft – 6,300.06 ft8 years in 10 fall in this range (36 years of records)
Same day last year
6,289.89 ft−8.41 ft
Lowest and highest in 30 days
6,274.04 ft – 6,281.48 ft
Lowest and highest in 12 months
6,274.04 ft – 6,302.56 ft

Boating and fishing at Island Park Reservoir

At low levels, launching can mean a long walk or a closed ramp, and shallow points stick out further than charts suggest.

Conditions at the shore change with the level, so check with the agency that runs the lake before a trip.

Weather at the gauge

No rain in the last 3 days.

17 Sat 58° 23° – Wind 14 mph
18 Sun 60° 31° – Wind 10 mph
19 Mon 61° 31° – Wind 10 mph
20 Tue 60° 43° 0.04 in Wind 10 mph
21 Wed 62° 40° – Wind 11 mph
22 Thu 62° 40° 0.11 in, 46% Wind 8 mph
23 Fri 47° 32° 0.85 in, 81% Wind 8 mph

Forecast: Open-Meteo

Sunrise 07:46 AM Sunset 06:36 PM Daylight 10 hr, 50 min First quarter 57%

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Henrys Fork near Island ParkRiver gauge, Henrys Fork 91.9 cfs Very low ±0 0.2 mi
Henrys Fork near LakeRiver gauge, Henrys Fork 0.3 cfs Very low ±0 12 mi
Henrys Lake and Henrys LakeLake 12.87 ft Low 13 mi
Madison River near West YellowstoneRiver gauge, Madison River 296 cfs Very low −7.0 cfs 23 mi
Henrys Fork near AshtonRiver gauge, Henrys Fork 622 cfs Very low ±0 25 mi
Fall River near AshtonRiver gauge, Fall River 450 cfs Very low +5.0 cfs 25 mi
Fall River near SquirrelRiver gauge, Fall River 216 cfs Very low +4.0 cfs 25 mi
Fall River above Yellowstone Canal near SquirrelRiver gauge, Fall River 427 cfs Very low −4.0 cfs 28 mi

Questions and answers

Is Island Park Reservoir higher than last year?

No, it is 8.41 ft lower than on the same day last year, when the reading was 6,289.89 ft.

What is a normal level for Island Park Reservoir in mid-October?

The median for mid-October is 6,293.87 ft. In 8 years out of 10 the reading falls between 6,280.23 ft and 6,300.06 ft, based on 36 years of records.

Is Island Park Reservoir really 6,281.48 ft deep?

No. 6,281.48 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 Island Park Reservoir today?

On Oct 17, 2026, the surface elevation was 6,281.48 ft. Up 2.02 ft over the last 7 days.

Is Island Park Reservoir rising or falling?

Up 2.02 ft over the last 7 days.

Is the level of Island Park 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:7184 (Agency page)
Coordinates
44.41893, -111.39843 (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 6,281.48 ft 2026-10-17 06:00 Provisional
Water stored 28,849 acre‑ft 2026-10-17 06:00 Provisional

Download

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How to cite

U.S. Bureau of Reclamation: Island Park Reservoir (usbr:7184). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/idaho/island-park-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