Exit 22 — Taming of the Slough

Sal on I-405 Northbound: Tukwila to Lynnwood · Oct 29, 2026 · 1m

Sal: Between exits twenty-two and twenty-three. Sal: The freeway crosses the Sammamish River here, which for decades was the Sammamish Slough and the course of the Slough Race. Starting in 1928, outboard boats raced up and down the 13-mile link between Lake Washington and Lake Sammamish, crashing into logs, bridge pilings and each other. Sal: In the mid-1960s the Army Corps of Engineers dredged and widened the slough, a project the racers called "The Taming of the Slough." The race was held 47 times. It folded after a spectator was hit by a boat in 1976, when the organizers could no longer…