The highway travels over the Snohomish River onto Smith Island, part of the Delta neighborhood of Everett that is named after the delta of the Snohomish River located to the southwest. The Snohomish River crossing was the busiest segment of SR 529 in 2007, with an estimated daily average of 33,000 motorists.
The highway's route over the Snohomish River and its connection to Smith Island, a part of Everett's Delta neighborhood named after the Snohomish River delta located to the southwest, highlights the importance of this crossing in 2007 as the busiest section of SR 529.