This bridge was Phase I of the West Seattle Bridge Project. ABKJ led a design team to replace a damaged bascule bridge. The project included a 590' concrete box girder structure with spans of 375', 590', and 375', and continuous prestressed girder spans up to 185' long. The High Level Bridge provides 5,600' of elevated freeway with a vertical clearance of 140' above the water.
This bridge was Phase II of the West Seattle Bridge Project. ABKJ led a design team to create this concrete double-leaf swing bridge that crosses the Duwamish River and connects Harbor Island to West Seattle. With a span of 480’, it is one of the largest swing bridges in the world.
ABKJ is a design services firm headquartered in Seattle, Washington known as the US Global Center. Founded in 1956, we have provided leadership and support for the most challenging and recognizable projects in the Pacific Northwest, across the United States, and around the world for private and public clientele requiring the highest level of capabilities.