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Potholes Reservoir and O'Sullivan water level

Reservoir, Washington, United States

Directions

High for mid-October

Surface elevation

1,032.45ft Up 2.17 ft over the last 7 days

Water stored
97,520 acre‑ft
1,028 1,030 1,033

History

1,0281,0301,032ftOct 12Oct 13Oct 14Oct 15Oct 171,0281,0301,032ftOct 12Oct 14Oct 17
1,0281,0301,032ftSep 19Sep 26Oct 3Oct 10Oct 171,0281,0301,032ftSep 19Oct 3Oct 17
1,0301,040ftOct 2025Jan 2026Apr 2026Jul 2026Oct 20261,0301,040ftOct 2025Apr 2026Oct 2026
1,0301,040ftOct 2016Apr 2019Oct 2021Apr 2024Oct 20261,0301,040ftOct 2016Oct 2021Oct 2026
1,0301,040ftJanMarMayJulSepNov20261,0301,040ftJanAprJulOct2026

202120222023202420252026

Surface elevation Normal range (10–90 %)

What this means

There is plenty of water in Potholes Reservoir and O'Sullivan: 1,032.45 ft, above normal for mid-October.

That puts it 2.05 ft above the median of 1,030.40 ft for mid-October, based on 36 years of readings. A year ago it stood at 1,032.45 ft as well.

The water is rising: up 2.17 ft over the past week. Over the past 30 days it has moved between 1,028.66 ft and 1,032.45 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
1,030.40 ft2.05 ft above the median for this date
Normal for this date
1,027.63 ft – 1,032.54 ft8 years in 10 fall in this range (36 years of records)
Same day last year
1,032.45 ft0.00 ft
Lowest and highest in 30 days
1,028.66 ft – 1,032.45 ft
Lowest and highest in 12 months
1,027.82 ft – 1,046.62 ft

Swimming and boating at Potholes Reservoir and O'Sullivan

A little more water than usual mostly means narrower beaches. Ramps and docks generally work as normal, but watch for floating debris after storms.

If you swim, pick a spot with an easy way out, and remember that drop-offs move as the level changes.

Weather at the gauge

No rain in the last 3 days.

17 Sat 71° 42° – Wind 12 mph
18 Sun 66° 41° – Wind 11 mph
19 Mon 65° 47° – Wind 7 mph
20 Tue 67° 47° – Wind 10 mph
21 Wed 69° 46° – Wind 5 mph
22 Thu 68° 47° – Wind 6 mph
23 Fri 65° 42° – Wind 14 mph

Forecast: Open-Meteo

Sunrise 07:20 AM Sunset 06:06 PM Daylight 10 hr, 46 min First quarter 49%

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Moses Lake at Moses LakeLake, Moses Lake 1,046.76 ft High +0.03 ft 9 mi
Crab Creek near Moses LakeRiver gauge, Crab Creek 3.25 ft Very high +0.01 ft 14 mi
Crab Creek near BeverlyRiver gauge, Crab Creek 3.71 ft Normal +0.11 ft 28 mi
Esquatzel Coulee at ConnellRiver gauge, Esquatzel Coulee 12.18 ft Normal −0.05 ft 29 mi
Soap Lake near Soap LakeLake, Soap Lake 1,068.34 ft Very low −0.01 ft 31 mi
Billy Clapp Lake and PintoReservoir 1,333.09 ft High 32 mi
Crab Creek at IrbyRiver gauge, Crab Creek 0.45 ft Low +0.03 ft 33 mi
Columbia River below Priest Rapids DamRiver gauge, Columbia River 6.25 ft Very low −0.11 ft 37 mi

Questions and answers

How does Potholes Reservoir and O'Sullivan compare with last year?

It is about the same as on this day last year, when the reading was 1,032.45 ft.

What is a normal level for Potholes Reservoir and O'Sullivan in mid-October?

The median for mid-October is 1,030.40 ft. In 8 years out of 10 the reading falls between 1,027.63 ft and 1,032.54 ft, based on 36 years of records.

Is Potholes Reservoir and O'Sullivan really 1,032.45 ft deep?

No. 1,032.45 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 Potholes Reservoir and O'Sullivan today?

On Oct 17, 2026, the surface elevation was 1,032.45 ft. Up 2.17 ft over the last 7 days.

Is Potholes Reservoir and O'Sullivan rising or falling?

Up 2.17 ft over the last 7 days.

Is the level of Potholes Reservoir and O'Sullivan normal?

High 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:7265 (Agency page)
Coordinates
46.98312, -119.27551 (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 1,032.45 ft 2026-10-17 07:00 Provisional
Water stored 97,520 acre‑ft 2026-10-17 07:00 Provisional

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How to cite

U.S. Bureau of Reclamation: Potholes Reservoir and O'Sullivan (usbr:7265). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-states/washington/potholes-reservoir-and-osullivan

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