Plans are underway to construct a temporary bridge across the Skagit River.
If things go well it could be up and running by mid-June, said Inslee.
The temporary four-lane bridge will carry I-5 traffic over the Skagit River at a reduced speed and capacity. The bridge will consist of two, 24-foot wide structures to replace the collapsed section of the bridge. The structures will be pre-built and trucked to the site.
A new bridge will be constructed adjacent to the temporary bridge, with a goal of finishing the permanent fix by fall.
The federal government is expected to cover 90 percent of the cost of the temporary bridge and the replacement.
On Saturday, barges arrived at the river with equipment ready to remove the mangled steel, pavement and cars in the water.
Bridge has history
Video courtesy of Ayman Mohyeldin shows the moments leading up to the accident and the impact.
The Washington Transportation Department says there are now two recommended options northbound and two options southbound around the collapsed Skagit River bridge in Mount Vernon.
Transportation officials say drivers can expect delays in both directions. About 71,000 vehicles use that stretch of highway every day. The bridge is about 60 miles north of Seattle and 40 miles south of the Canada border.
Officials are urging drivers to avoid the area if possible. But if you must go, check the Department of Transportation website for up-to-date information.
Detour information from WSDOT
The Department of Transportation will continue to modify the detour routes. Find up-to-date information at the following locations
There are several ways you can keep updated on traffic through the area:
Planes, trains are an alternative to automobiles
Amtrak and BNSF are taking on more passengers. Alaska Airlines also announced a special fare of $99 each way, Seattle to Bellingham, through June 1. Some people are flying via Kenmore Air
Amtrak says it plans to add one daily round trip between Seattle and Bellingham.
In a statement, Amtrak, WSDOT, Sound Transit and BNSF Railway said they're working together to add the service. It would involve a morning departure from Seattle to Bellingham with an early evening return to help those who normally drive the route. Spokesmen said more details will be released as they become available.
Amtrak says its Amtrak Cascades service provides four trips each day over the Skagit River Rail Bridge, which remains fully functional.