Spokesman Travis Phelps said the framework is in place and workers are tightening bolts and welding sections on the temporary structure that's 24 feet wide and 160 feet long.
He said they'll be installing panels Monday that will be paved with asphalt to form the new bridge deck.
Some other work remains, such as divers' inspecting piers, so the department isn't saying yet what day the Mount Vernon bridge will reopen.
Traffic has been detoured since May 23 when a truck with and oversize load struck the 58-year-old span, causing it to crumble. The bridge carried 71,000 vehicles a day.
More Northwest Headlines
Bail hearing today for Granite Falls man arrested for racial threats at WWU 12:58 p.m. Prosecutors lay out details in case against state auditor 2:39 p.m. Coast Guard helicopter grounded after laser incident 3:58 p.m. Board changes residency rules for legal pot businesses 3:14 p.m. Police investigate death of Alaska’s capital city mayor 2:33 p.m. Corgi ends up in Honolulu instead of Mississippi 1:17 p.m. Scientists push for pot pesticide testing before new rules 1:03 p.m. Principals call teacher shortage in state a ‘crisis’ 12:39 p.m.
Our new comment system is not supported in IE 7. Please upgrade your browser here.