SPAGHETTI BOWL RTC Workshop April 20, 2018
EIS TIMELINE PLANNING NEPA FINAL DESIGN & ROW CONSTRUCTION
ALTERNATIVES UPDATES We will review changes to the Alternatives Alternative 1 Alternative 2 Alternative 3 All alternatives are preliminary. All Information is Preliminary and Subject to Change
ALTERNATIVE ONE Image of Braided Ramps: I-405 in Bellevue, Washington NO CHANGES Braided ramps: Separate merging traffic to improve safety, ease congestion Maintains all current entrances/exits to freeways Expanded footprint of Spaghetti Bowl and freeway system Removes Airport Ramps All Information is Preliminary and Subject to Change
ALTERNATIVE TWO NORTH Reconfigured Spaghetti Bowl Design Wells-Oddie operations & access Kietzke interchange Plumb/airport access The Nugget viaduct
All Information is Preliminary and Subject to Change ALTERNATIVE TWO WELLS-ODDIE OPERATIONS ODDIE BLVD. NORTH
ALTERNATIVE TWO KIETZKE W/ SLIP RAMPS TO ROCK NORTH All Information is Preliminary and Subject to Change
ALTERNATIVE TWO AIRPORT ACCESS Freeway entrance/exit pushed from Villanova to Plumb Plumb becomes Diverging Diamond Interchange (DDI) Airport direct connect ramps removed NORTH
ALTERNATIVE THREE Partial Cloverleaf at Wells and Oddie interchanges: Movements stay at grade More space to weave and merge Removes Center St. Access Button hook at 2 nd /Glendale and Mill streets Airport direct connects stay NORTH
2 nd St./Glendale ALTERNATIVE THREE GLENDALE NORTH All Information is Preliminary and Subject to Change
ALTERNATIVE TWO THE NUGGET Bridge widened between The Nugget buildings Five lanes each direction Minimal disruption to The Nugget NORTH
Alternatives Evaluation Local Agencies Review and Evaluation of the Alternatives. Presentation to Executive Committee for Endorsement. Follow up with Agencies. Begin Drafting EIS. All Information is Preliminary and Subject to Change
EIS MOVING FORWARD Continued stakeholder & public outreach Environmental Studies and Impact Analysis Updates to Alternatives Draft Environmental Impact Statement (DEIS) Fall/Winter 2018 Project Challenges Airport Ramps All Information is Preliminary and Subject to Change
SB I-580 EARLY ACTION PROJECT Aligns with Ultimate/Preferred Alternative in EIS Documented Categorical Exclusion Design Build Project Scope Spaghetti Bowl to Viaduct 2 lanes ES Ramp Widening SB 580 with additional lanes Glendale/Mill Interchange All Information is Preliminary and Subject to Change
SB I-580 EARLY ACTION PROJECT PHASE 1 Eastbound I-80 backups approaching exit to I-580/US 395 greatly reduced or eliminated; Southbound I-580/US 395 backups at the Spaghetti Bowl eliminated; Overall, freeway safety in general should improve SCHEDULE Design Build - Transportation Board Approval in May RFQ release in June Final RFP November-December 2018 Award Summer 2019 Design & construction begins August 2019 through August 2022
SB I-580 EARLY ACTION PROJECT
QUESTION & ANSWER
ALTERNATIVE ONE MILL/GLENDALE NORTH All Information is Preliminary and Subject to Change
COMMON IMPROVEMENTS FOR BUILD ALTERNATIVES Full shoulders Five freeway lanes in each direction approaching the Spaghetti Bowl Three lanes through the Spaghetti Bowl in each direction Enhanced landscape and aesthetics Program of improvements Some right-of-way acquisition will be required in advance of construction All Information is Preliminary and Subject to Change
ALTERNATIVE ONE SPAGHETTI BOWL NORTH All Information is Preliminary and Subject to Change
ALTERNATIVE ONE Image of Braided Ramps: I-405 in Bellevue, Washington NO CHANGES Braided ramps: Separate merging traffic to improve safety, ease congestion Maintains all current entrances/exits to freeways Expanded footprint of Spaghetti Bowl and freeway system All Information is Preliminary and Subject to Change
ALTERNATIVE THREE ROCK ACCESS NORTH All Information is Preliminary and Subject to Change