Castle Lake, WA

As of 2026-10-13, Castle Lake sits at 2577.73 ft. Over the past 30 days the level has risen 0.01 ft.

The most recent reading at Castle Lake is 2577.73 ft (2026-10-13), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.

Readings for Castle Lake run from 2577.53 ft to 2577.95 ft over the 112 days on file, which begin 2026-06-24. That window is shorter than a year, so neither end is a record for the lake. A lake's range includes a full seasonal cycle, and this gauge has not yet published one.

Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Castle Lake has risen 0.01 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.

Year-over-year comparison is not available for Castle Lake yet. The published series on this page covers 112 days, from 2577.53 ft to 2577.95 ft. That is not long enough to describe the lake's historical range.