SR 529 Northbound Snohomish River Bridge

Snohomish River Bridge (Everett, WA)

Type: Span Drive Vertical Lift
Location: Everett, WA
Client: Washington State Department of Transportation


Stafford Bandlow Engineering personnel provided all necessary mechanical engineering for this time critical replacement of wire ropes and wire rope equalizer assemblies on this vertical lift bridge.  The rehabilitation included specification of ropes, removal of existing counterweight ropes and rope equalizer assemblies, and design of replacement equalizer assemblies.  All work was performed on an emergency basis as a result of testing that indicated a significant reduction in strength of the existing counterweight ropes.  Our engineering services included preparing all necessary calculations, preparation of shop drawings to expedite the manufacturing process, preparation of material and installation specifications, working with vendors to obtain cost estimates and scheduling information, shop inspection of manufactured parts and providing assistance to Washington State DOT throughout construction.  The project, including all engineering, manufacturing and replacement of the counterweight wire ropes and equalizer assemblies, was completed in three months.