A new assessment of King County’s transportation infrastructure in the unincorporated areas shows that 30 to 40 percent of the roads are at risk of failure over the next decade and 28 bridges will need to be replaced in the next 30 years.

In the assessment handed over to the King County Council last week, along with a mid-biennium supplemental budget for the Roads Division, County Executive Dow Constantine urged councilmembers to help ensure that road services and safety are maintained despite rapidly deteriorating infrastructure and shrinking revenues.

The new budget, however, does not contain any funds for Dockton Road along Tramp Harbor, considered one of the most vulnerable spans in unincorporated King County. Nor is it in the county’s $217 million, six-year capital improvement program, said Paula Norman, acting director of the Roads Division.

“We do have a real concern, because we’ve identified this aging infrastructure, and Dockton is one of those that is at high risk of failure,” Norman said.

The road will continue to be maintained as needed, she added. “Dockton road is safe but vulnerable,” she said.