Potholes Reservoir lake and shoreline

Potholes Reservoir Water Level

Washington

Make Home Lake
Favorite

Share current lake level

Share Potholes Reservoir's current conditions.

Potholes Reservoir

The latest available reading shows Potholes Reservoir is currently 18.0 feet below full pool, with a water-surface elevation of 1029.0 feet.

1028.99 ft · Updated 9 days ago · USBR (Columbia Basin Project, O'Sullivan Dam)

Current level

1,028.99ft

−18.01 ft vs full pool

Status unavailable

Vs full pool

Since last reading

Down 0.05 ft

Previous readingSep 281,029.04 ft

7-day change

Up 0.33 ft

7-day trend: Rising

8 daily readings in the last 7 days

30-day change

Up 1.14 ft

21 daily readings in the last 30 days

Share feedback or correction

Keep up with Potholes Reservoir

Follow for weather alerts and lake notices

Save Potholes Reservoir and get weather alerts and lake notices, plus water levels, weather, fishing conditions, and events on your dashboard. Water-level change notifications are not included.

  • Lake Alerts

    Weather alerts and lake notices for this lake.

  • Fishing Outlook

    See fishing conditions and the best days ahead.

  • Dock Talk

    Ask questions and hear from people around the lake.

Follow Potholes Reservoir — Free
  • No credit card
  • Personalized to Potholes Reservoir
  • Weather alerts and lake notices

Water Level History

Current
1028.99 ft
24h
-0.05 ft
7d
+0.33 ft

Elevation (ft) NGVD29 · MSL

Reference line is designed full pool.

Follow for weather alerts and lake notices

Get weather alerts and lake notices for Potholes Reservoir. Water-level change notifications are not included.

Follow Potholes Reservoir — Free

Lake Level Context

Level remains below the full pool

Potholes Reservoir is currently 1028.99 ft, 18.01 ft below its full pool. The lake has risen 0.33 ft over the past 7 days and 1.14 ft over the past 30 days.

Potholes Reservoir Level Details

Reference elevations, recent daily readings, data sources, and answers to common questions.

Conditions & Reference

Level status

18.01 ft below full pool

Current level
1,028.99 ft
Full pool
1,047 ft
DatumElevation referenced to National Geodetic Vertical Datum of 1929.
NGVD29
Elevation reference
MSL
Source
USBR (Columbia Basin Project, O'Sullivan Dam)

Reference levels

  • Full pool1,047 ft

Surrounding county drought

Moderate Drought

100% of surrounding county in official drought (D1–D4).

Severity

NoneExtreme
Trend
Stable

Surrounding county drought

Grant County, WA

Moderate Drought

Moderate Drought. The largest share of Grant County, WA is in Moderate Drought (D1), an official USDM drought category. These figures describe the surrounding county from the lake location, not the lake itself.. Trend: Stable compared with last week. Official drought (D1–D4) yes

Severity

NoneExtreme

Weekly trend

Stable

Compared with last week

Official drought (D1–D4)

Yes

100% of the surrounding county is in official drought categories (D1–D4). Dominant category remains Moderate Drought.

Typical county impacts (USDM guidance)

  • Streamflows in the surrounding county may run below normal
  • Soils and vegetation can dry between rain events
  • Water managers may begin to watch supply more closely

U.S. Drought Monitor · map date Oct 6, 2026. Updated weekly. Official drought means U.S. Drought Monitor categories D1–D4 (Moderate through Exceptional). Abnormally Dry (D0) is not counted as official drought. droughtmonitor.unl.eduView drought map for Grant County, WA

Daily level summary

DateLevelChange
Sep 29, 20261,028.99-0.05
Sep 28, 20261,029.04+0.04
Sep 27, 20261,029+0.08
Sep 26, 20261,028.92+0.06
Sep 25, 20261,028.86+0.05
Sep 24, 20261,028.81+0.04
Sep 23, 20261,028.77+0.11

Common questions about Potholes Reservoir’s water level

  • The current water level at Potholes Reservoir is 1,028.99 ft (updated 9 days ago). You can track the Potholes Reservoir lake level on the interactive chart and daily history above.

  • Full pool for Potholes Reservoir is 1,047 ft — the normal conservation target elevation when the reservoir is at its designed summer or operating pool.

  • The current 7-day trend for the Potholes Reservoir lake level is rising — rising about 0.33 ft over the past week. See the history chart above for the full picture.

  • Based on the latest gauge reading, Potholes Reservoir is currently 18.01 ft below full pool.

Lake level glossary

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

Privacy preferences

Ads and analytics are not optional. You can still choose optional functional cookies. Essential cookies stay on so the site works.

  • Essential

    Required for sign-in, security, and core site features. These cannot be turned off because the service would not work without them.

  • Functional & preferences

    Remembers optional choices such as display preferences beyond what essential cookies require. Most preference storage today is essential for signed-in features.