how deep is lake washington

Lake Washington is about 214 feet (around 65 meters) deep at its deepest point.

Basic depth facts

• Maximum depth : About 214 feet / 65 meters, measured in the central trench of the lake.

• Average depth : About 108 feet / 33 meters, meaning much of the basin is still quite deep.

• The lake bed is generally steep-sided, with many areas dropping toward roughly 200 feet depth not far from shore.

Why it feels so deep

• Lake Washington is long (about 22 miles) and narrow, so winds can build up waves and make the depth feel more intimidating from small boats.

• The water column often stratifies, forming colder deep layers, which can surprise swimmers and divers even in summer.

Quick safety perspective

• For a city lake, 214 feet is very deep, comparable in feel to some smaller fjord-like or mountain lakes, so good flotation and cold-water awareness are important when boating or swimming.

• Local agencies treat it as a large, cold-water body, recommending life jackets and caution far from shore, especially where the bottom drops off quickly.

Information gathered from public forums or data available on the internet and portrayed here.