After traversing downtown, the highway ends at an interchange with U.S. Route 2 (US 2) and US 97 north of the Wenatchee River in Sunnyslope.

The area around the Senator George Sellar Bridge is being improved by the Washington State Department of Transportation to handle increased traffic.

[11][12] The Senator George Sellar Bridge is the busiest section of SR 285, being used by a daily average of 52,000 vehicles in 2011.

The southern end of the one-way pair, at the intersection of Chelan Avenue and Mission Street, had a daily average of 22,000 vehicles in 2011.

[22] US 10 was re-routed south to cross the Columbia River at Vantage in the 1940s and was designated as US 10 Alternate,[23] until US 2 was extended from Bonners Ferry, Idaho to Everett in 1946.

[31] SR 285 was established in 1977 to maintain the Senator George Sellar Bridge and only included the short route until 1991,[32] when it was extended to Sunnyslope.