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I-5/SR 161/SR 18 - Interchange Improvements
The interchange will be modified to eliminate the current ramp weave on southbound I-5 and westbound SR 18. This project will partially rebuild the I-5 & SR 18 interchange by removing the northwest cloverleaf ramp and replace it with a flyover ramp from westbound SR 18 to southbound I-5. A new direct connection from westbound SR 18 to SR 161 in the vicinity of S. 359th St. is included. This project will reduce congestion at the I-5/SR 18/SR 161 interchange and improve safety.
 PIN#:  800502K   Project Page
 DOT Region:  Northwest
 Counties:  King
 State Route:  005
 Location:  Federal Way   Locate Project
 Leg Districts:  30
 Program / SubProgram:  Improvement
 Sub-Program:  Mobility
 Sub-Category:  Urban Mobility
 Improvement Type:  Urban Mobility - Interchange New or Rebuild
 Mile Posts: 141 to 142.9    
  Project Costs:
Phase From - To Prior 15-17 17-19 19-21 21-23 23-2525-27 Future Total
Preliminary Engineering May-12 - Apr-15 14,044,000000000014,044,000
Right of Way Apr-14 - Sep-15 4,953,00000000004,953,000
Construction Jan-15 - Jun-17 67,229,0003,048,00000000070,277,000
  Project Totals:  86,226,000 3,048,000 0 0 0 00 0 89,274,000