SR 18 - Eastbound Off-ramp to SR 164 - Project concepts

Concept 1
Improve current corridor

SR 164 project concept 1

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About this concept:

  • Improvements to Auburn Way South (SR 164) corridor including turn-lanes and channelization at congested locations
  • Potential grade-separated lanes at the SR 18 interchange

Benefits of this concept include:

  • Uses the current roadway within the right of way
  • Low environmental impact

Challenges of this concept include:

  • Right-of-way and access may be impacted for existing businesses

 

Concept 2
New local connection

SR 164 project concept 2

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About this concept:

  • Extend R Street south of Auburn Black Diamond Road under SR 18 to 17th Street SE
  • Potential extensions from R Street to M Street using 6th Street SE, and 12th Street SE

Benefits of this concept include:

  • Provides new north-south regional connection and access to developable land within the urban growth area
  • Uses existing R Street undercrossing
  • Consistent with city plans

Challenges of this concept include:

  • May increase traffic across BNSF tracks
  • Right-of-way is constrained at north intersection
  • Connects indirectly to SR 164 (Auburn Way South)

 

Concept 3
Enhance access to SR 18

SR 164 project concept 3

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About this concept:

  • Connection between Auburn Way South (SR 164) and SR 18 with either new ramps to SR 18 or connecting to existing ramps at Auburn-Black Diamond Road.
  • New roadway connection between SR 18 or Auburn-Black Diamond Road and Auburn Way South (SR 164) somewhere between Muckleshoot Plaza and Dogwood Street SE
  • Includes new connection between Auburn-Black Diamond Road and M Street SE

Benefits of this concept include:

  • Provides direct arterial access to SR 18, bypassing Auburn Way South (SR 164)
  • Could use the existing SR 18 ramps at Auburn- Black Diamond Road
  • Could improve or eliminate at-grade, skewed BNSF crossing or allow bypass of the crossing using M Street

Challenges of this concept include:

  • New SR 18 access ramps would be costly and may impact traffic on SR 18
  • New roadway connection at Dogwood would require mitigation of neighborhood impacts.
  • Connection at Muckleshoot Plaza and Riverwalk could impact Tribal property
  • Connection at Riverwalk could impact Casino buildings and circulation

 

Concept 4
Eastern connections to Auburn-Black Diamond Road to Auburn Way South

SR 164 project concept 4

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About this concept:

  • Connections from SR 18 at the Auburn Black Diamond Road interchange to Auburn Way South (SR 164)
  • Potential optional connections at Academy Drive SE or Noble Court SE
  • Uses existing right of way on Green Valley Road

Benefits of this concept include:

  • Provides new north-south connection and access east of Auburn
  • Provides a direct regional connection between SR 18 and Auburn Way South

Challenges of this concept include:

  • Outside Urban Growth Area
  • Not identified in comprehensive plans
  • Traverses steep and unstable slopes
  • Could increase traffic adjacent to schools
  • Impacts to heritage sites and farm land

 

Evaluation Criteria

As we evaluate these concepts, we will consider transportation benefits and impacts to the built and natural environment. Each will be evaluated as part of the practical solutions process. These Resource Areas are those identified in the National Environmental Policy Act (NEPA) and must be evaluated as part of the project.