The next semi-annual inspection shutdown weekend for the Alaskan Way Viaduct is March 21-22, according to an e-mail update that just arrived from WSDOT. Here are the specifics: Closed 6 a.m. to 6 p.m. on Saturday, March 21, and 6 a.m. to 6 p.m. on Sunday, March 22, with the Battery Street Tunnel scheduled for continuous shutdown 11 pm Friday 3/20 to 5 am Monday 3/23. They’re also offering walking tours of The Viaduct on Saturday morning 3/21, by reservation – e-mail viaduct@wsdot.wa.gov, or call 888–AWV–LINE (first-come, first-served).