press release:

Overnight on Tuesday August 9 through Friday August 12, from 11:00 PM until about 5:00 AM, northbound Routes 21, 22, 56 & 85 Night Owl will be rerouted off of 1st Av S at Spokane St, due to construction.

Heading toward downtown Seattle, Routes 21, 22, 56 & 85 Night Owl will travel instead via 4th Av S, S Horton St and 1st Av S to their regular route.

Southbound service heading toward West Seattle will not be affected.