#16. SR-18, 180th Avenue Southeast to Maple Valley |
Project address: |
The upgrades between 180th Avenue Southeast and Maple Valley are part of a larger project, ongoing since 1991, to widen Route 18 and make safety improvements in the corridor from Auburn to Interstate 90. Approximately four miles of highway will be widened to four lanes with a 48-foot grass median. Scarsella Brothers Inc. is constructing a new interchange at Southeast 256th Street and a new undercrossing at Southeast 240th Street, and will build seven new bridges. Extensive stream and wetland mitigation is under way to minimize the environmental impact.
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