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I-5 Mounts Road to Thorne Ln I/C - Corridor Improvements - Project Map

I-5 Mounts Road to Thorne Lane I/C Corridor Improvements - Project Map

The above vicinity map shows proposed elements of the I-5 - Mounts Road to Thorne Lane I/C Corridor Improvements project. The Build Alternative now undergoing environmental review includes:

  • Adding one lane each direction from Steilacoom-DuPont Road to Thorne Lane.  
  • Rebuild interchanges using roundabouts at Thorne Lane and Berkeley Street.
  • Build a new local connector road between Gravelly Lake Drive and Thorne Lane.
  • Build a bicycle/pedestrian path along the I-5 corridor.
  • Improvements to the Steilacoom- DuPont Road interchange are still being defined.