Road Services - Bridges
King County is committed to bridge safety
King County anticipates closing 35 bridges over the next 25 years if we don’t get enough funding to repair and replace aging and obsolete structures.
The Road Services Division regularly inspects the bridges it is responsible for maintaining. Sometimes we have to close bridges that are at risk including the Alvord T Bridge, which we closed in June 2013. When we are able to get grant funding, like we did with the South Park Bridge, we can replace bridges at risk rather than close them permanently.
- Visit the Capital Improvement Program website for a complete listing of bridge projects.
Load-limited bridges and permits
What are the load limit restrictions for King County bridges and how are they decided on?
A bridge load rating is the measure of a bridge's load carrying capacity. National Bridge Inspection Standards (NBIS) require the posting of load limits on a bridge, if a legal load configuration exceeds the operating rating for that bridge. The bridges are posted for AASHTO trucks Type 3, Type 3S2 and Type 3-3 which are intended to encompass the majority of loads to which a bridge might be subjected. A list of posted bridges with their corresponding load limits can be found here. (640KB .pdf)
Where can I find a bridge maintenance schedule?
To request the schedule for bridge maintenance, please contact the Road Services Division's Engineering Services Section by email or at 206-477-3611.
When should I apply for an overlegal load permit?
As a general rule of thumb, if the bridge load limit is posted or your truck's weight exceeds the maximum legal load, you should apply for a permit. If your truck configuration matches the posted truck not exceeding the maximum amount allowed gross vehicle weight, then you may proceed without a permit - learn more.
Other agencies' bridge information
Engineering Services Section
King County Road Services Division
201 S. Jackson St.
Seattle, WA 98104
TTY: 711 Relay Service
Information from the Road Services Division's website is available to people with disabilities in alternate formats upon request by calling 206-477-3839 or 711 for the TTY relay service.
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