Lake Shannon, WA

As of 2026-10-13, Lake Shannon sits at 415.74 ft. Over the past 30 days the level has risen 7.87 ft.

The most recent reading at Lake Shannon is 415.74 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 Lake Shannon run from 407.54 ft to 437.37 ft over the 176 days on file, which begin 2026-04-21. 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. Lake Shannon has risen 7.87 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 Lake Shannon yet. The published series on this page covers 176 days, from 407.54 ft to 437.37 ft. That is not long enough to describe the lake's historical range.