Three months after SDOT closed the Andover bicycle/pedestrian bridge over the west end of the West Seattle Bridge, they’re one month into construction of its retrofit, with two months to go. Here’s the update we just received:
We began construction in mid-October on the SW Andover St Pedestrian and Bicycle Bridge Seismic Retrofit Project and are on schedule to complete construction in the next two months.
The SW Andover St Pedestrian and Bicycle Bridge is a vital pedestrian connection between the Youngstown and Genesee neighborhoods. The bridge was built in 1961, prior to the modernization of the seismic design code. This project will strengthen key bridge components to better withstand seismic events like earthquakes.
What’s happening now?
We’re installing new bridge expansion joints, which allow the concrete to naturally expand and contract without cracking. The bridge deck was originally supported by three joints that were not adequately connected to each other to withstand an earthquake. The bridge will be fused together with steel plates, additional rebar, and concrete to improve its resilience to earthquakes.
We’re also strengthening the east side of the bridge where it is secured to the ground. Four long steel rods, called ground anchors, will be installed 40 feet deep into the ground to support this side of the bridge. These improvements will make the bridge stronger and safer in the event of an earthquake.
We are on schedule to complete the work in the next two months. As soon as construction is done, we’ll open the bridge for use again.
Cost of the project is estimated at $1.9 million.