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PHOTOS: Sylvester Road Bridge Construction Update

Story & Photos by Brett Fish

Construction on the Sylvester Road Bridge continues to move along; below are some photos and updates (click images to see larger versions):


The Bridge End Diaphragms have the function of tying the bridge spans together at each end.

They will measure about 2 feet 6 inches thick. An estimated 57 cubic yards of concrete has been poured.

(Lower right) Jareed Rockey and Josh Thibeault are finishing up the “kickers” that hold the end diaphragm forms in place during the concrete pour. Huge concrete “Eco Blocks” (also known as deadman blocks if they roll on you) lend the bracing power needed to secure the kickers to the base of the walls.

David Tedesma on top of the Wing Wall installs conduit tubing in the curb forms.


With the end diaphragms poured the approach slab fill is imported and compressed to specs. William Parsons from King County's Materials Laboratory (in the top 5 of the nation) checks for moisture content and compaction using a Troxler 3440 moisture and density gauge.

Section by section the pedestrian barriers are being poured, water main and utilities being installed, the approach slabs being prepared. The sidewalk will be last to be poured. Progress is rapid now as workers push hard to complete the project. Crews are working 6 days a week. It won’t be long now.


Infrastructure details include boring a water main hole through the end diaphragms. There is light at the end of the tunnel between the giant bridge girder spans. Large steel water pipes are carefully cut to size and installed.


Don Vaughn, finisher (top left) and Mario Arroyo (lower left) SB Structures, complete the details to the block outs in the (pedestrian) barrier rail. (Upper right) A preview of a completed section. (Lower right) Carpenters David Tedesma, Jered Rockey, Justin Tooman, Josh Thibeault build the last pilaster form. Completed pilasters can be seen in the far left and center right of that photo.

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