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WashingtonReservoir, 8,146 acres, Franklin County

Lake Sacajawea water level

Lake Sacajawea, Washington
Photo: Wikimedia Commons, Public domain

Current level

439.08ft above sea level

Reading from Oct 26, 2026

Past 24 hours
+0.02ft
Past 7 days
+0.11ft
Past 30 days
+0.19ft
Trend
Rising

Lake Sacajawea was at 439.08 ft on October 26, rising 0.11 ft over the past week.

Last 30 days

438.5439.0Sep 26Oct 11Oct 26

Recent daily readings

Lake Sacajawea daily mean water level, newest first
DateLevel (ft above sea level)Change
Oct 26, 2026438.99-0.07
Oct 25, 2026439.06+0.11
Oct 24, 2026438.95-0.05
Oct 23, 2026439.00-0.13
Oct 22, 2026439.13-0.04
Oct 21, 2026439.17+0.28
Oct 20, 2026438.89-0.08
Oct 19, 2026438.97-0.03
Oct 18, 2026439.00+0.03
Oct 17, 2026438.97+0.25
Oct 16, 2026438.72-0.10
Oct 15, 2026438.82-0.22
Oct 14, 2026439.04+0.35
Oct 13, 2026438.69+0.21

Reading these numbers

Readings are reservoir surface elevations in feet, as published by the U.S. Army Corps of Engineers. Compare them with ramp and dock elevations from the lake operator to judge whether a launch is usable.

On a reservoir, a few feet of drop changes the shoreline more than you would think. Low water exposes stumps, sandbars and old roadbeds that are normally well under the hull, and some ramps end before the water does.

High water brings its own problems: floating debris after storms, flooded docks and courtesy piers, and no-wake rules near flooded campgrounds. A quick look at the trend before you hitch up saves a wasted trip.

The gauge is listed by USACE as Ice Harbor Lock and Dam. Wind can pile water up at one end of a big lake for a few hours, so short spikes on a windy day are normal.

Lake Sacajawea water level questions

What is the water level at Lake Sacajawea today?

Lake Sacajawea was at 439.08 ft on October 26, rising 0.11 ft over the past week.

Is Lake Sacajawea rising or falling?

Over the last seven days the level has risen (+0.11 ft), and it is +0.19 ft compared with 30 days ago.

Where does the Lake Sacajawea water level data come from?

From the U.S. Army Corps of Engineers reading at Ice Harbor Lock and Dam. The Corps reports pool elevation, usually every hour, and early values can be revised after review.

How often is this page updated?

The page itself is rebuilt every day with the latest daily values, and the current reading refreshes straight from the Corps of Engineers each time you open it.

Nearby lakes

If Sacajawea is blown out, these are the closest alternatives. Tap through for their water levels.