Fifteen Mile Creek Bridge #493C Replacement Project

The project involves the comprehensive replacement of Fifteen Mile Creek Bridge #493C on SE May Valley Road in King County, Washington. Key activities include clearing and grubbing, grading, installing gravel borrow, and managing drainage systems. The work also entails removing the existing bridge structure, constructing drilled shaft foundations with concrete caps and walls, and installing precast voided slab units reinforced with Ultra High Performance Concrete (UHPC) shear keys. Additional construction elements involve applying a polyester concrete overlay, protecting trees and removing invasive species, implementing erosion control measures, and surfacing the roadway with crushed surfacing material and hot mix asphalt paving. Safety features such as bridge rails, beam rails, and guardrails will be installed, alongside temporary traffic control measures to ensure safe passage during construction. The project also includes large woody placements and other related work to complete the bridge replacement. The contract, managed by King County, has a project size estimated between five million and ten million dollars and is scheduled for solicitation with a response deadline of October 20, 2025. The project aims to improve infrastructure resilience and safety in the area, with primary contact being Leeann Snyder. The work is part of a broader effort to maintain and upgrade transportation infrastructure within the region, emphasizing quality construction and environmental protection throughout the process.