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Coast Guard will allow for less expensive Interstate 5 Bridge design
On Friday, the U.S. Coast Guard reduced the minimum navigation clearance to 116 feet, allowing the Interstate Bridge Replacement program to proceed with a fixed-span design, Sen. Maria Cantwell said.
Previously, a PNCD had required 178 feet, which would have forced a movable span and a drawbridge, prompting Washington and Oregon officials and the Interstate Bridge Replacement team to push a fixed-span proposal with mitigation agreements for upriver companies.
A 116-foot span would serve roughly 99% of vessels on the Columbia River, reducing lift operations and saving $500 million to about $1 billion compared to a movable span.
Program managers are now pursuing federal sign-off to secure a record of decision and begin contracting this year, as the IBR Program will finalize its cost estimate and schedule, key steps advancing federal environmental review.
Despite the clearance decision, officials warn the project is less than halfway funded, with new draft totals $13.6 billion and a budget gap of at least $7 billion.