WSDOT says Seattle’s SR 99 Tunnel: A safer place to be in an earthquake
information from WSDOT
In 2001, the Nisqually earthquake shook the Seattle region and the Alaskan Way Viaduct along with it. The viaduct was repaired and strengthened, but the aging structure was still vulnerable to earthquakes and a modern replacement was needed.
Now, the Washington State Department of Transportation is on the cusp of retiring the viaduct and opening the new State Route 99 tunnel built underneath downtown Seattle. The modern tunnel’s sophisticated systems are designed to help keep vehicles moving and travelers safe – including during earthquakes.
“The viaduct was built in the 1950s and seismic design is now light years ahead of what we knew back then,” said David Sowers, deputy administrator of the Alaskan Way Viaduct Replacement Program. “Ultimately, replacing the viaduct is all about keeping people safe and this new tunnel meets the gold standard for safety.”
