The South Spokane Street Viaduct, a key structure for Seattle's transportation network, is currently undergoing deck rehabilitation to maintain its durability and serviceability. Initially built in the 1920s, the viaduct is exposed to the constant wear of heavy freight vehicles, buses, and a high volume of cars, with the additional challenge posed by wet weather. According to Seattle's official government website, a deck rehabilitation project has been allocated the necessary funds and labor force to repair the road's surface, which is showing wear in the form of cracks due to heavy daily use.
In efforts to prepare the viaduct for continued heavy use and prevent further deterioration of the surface, Seattle's Department of Transportation (SDOT) detailed their plan to grind down the current road surface and then blast it to create a coarser texture. This texture, they explain, "will help the polyester coating stick better," as mentioned on the Seattle government website. After grinding, a polyester overlay will be applied to all three eastbound lanes, while the westbound lanes will receive spot repairs. A significant part of this project also involves upgrading the scuppers, which are essential for proper water drainage from the road surface and ultimately ensure safer driving conditions.
The comprehensive work schedule extends over the next two weeks, requiring closures most weeknights and the entire weekend. Seattle's official government website notes that during these periods, "all eastbound lanes will be closed as well as all eastbound off-ramps to SODO surface streets." Drivers normally taking the West Seattle High-Rise Bridge will instead be rerouted onto northbound SR 99.
SDOT provides detours for commuters affected by the construction. For those traveling from the West Seattle Bridge to I-5, the recommended path is via SR 99 north towards downtown, then utilizing 1st Ave S to the Edgar Martinez Dr S freeway on-ramp. For access to SODO, the West Seattle Low Bridge (Spokane St Swing Bridge) is advised as the alternative route. In the week starting Monday, August 5, 2024, "the farthest right lane (the southernmost) will be shut down," however, the 1st Ave and 4th Ave exits will remain open for access to SODO, as stated on the Seattle Government website. Commuters and residents are encouraged to stay informed of the construction schedule, as it is subject to change.
