The Washington State Dept. of Transportation (WSDOT)'s webpage has the latest detour information to navigate around the closed section of Interstate 5 due to the collapse of the bridge between Burlington and Mount Vernon.
Also on the page is information about the cause, clean-up conditions, lists of other fracture critical and functional obsolete bridges in the state. A link to Amtrack is also included.
The Town of Friday Harbor provided the two maps (links posted below) last week. It should be noted "Best Road" detour jams up for those traveling south-bound due to the need to turn left just before reaching the freeway. Taking it north shouldn't pose a problem.
Another option to get to the mainland from Anacortes ferry terminal is to drive through Whidbey Island and take the Clinton/Mukliteo ferry.
Additional information about the bridge collapse is available on numerous sites.
The Seattle Times has excellent indepth coverage of the collapse, the repercussions.
TWITTER accounts with postings by WSDOT and other government agencies and anyone else with updates/comments:
MAPS - provided by the Town of Friday Harbor
PDF MAP Traveling SOUTH-BOUND to Anacortes ferry terminal
PDF MAP Traveling NORTH-BOUND to Anacortes ferry terminal
The bridge on the top of the photo is the I-5 bridge.
The middle bridge is for surface streets in Burlington.
The lowest bridge in the photo is a rail road bridge.
All photographs by Darryl Swenson,
amateur aerial photographer, website Darryl Swenson's Photographs.