West Seattle and Ballard Link Extensions DRAFT Stakeholder Advisory Group | 7.16.18
SODO Evaluation Results
Level 2 alternatives SODO and Chinatown-ID • ST3 Representative Project • Massachusetts Tunnel Portal • Surface E-3 3
SODO and Chinatown-ID – Level 2 alternatives 4
SODO and Chinatown-ID Level 2 Alternative – ST3 Representative Project 5 5
New Lander roadway At-grade overcrossing SODO Station = Refinement from Level 1 SODO and Chinatown-ID Level 2 Alternative – Massachusetts Tunnel Portal 6
SODO and Chinatown-ID Level 2 Alternative – Surface E-3 7
Additional feedback SODO and Chinatown-ID Consider 4th Avenue location for Chinatown-ID station Explore alignments further west of ST3 Representative Project 8
SODO Alignment and Station Alternatives
Service to SODO destinations SODO station Maintain freight transfer mobility E-3 Busway Safety utilization SODO segment community concerns
Service to SODO Destinations
SODO Station Transfer
E-3 Busway Utilization
Maintain Freight Mobility
Interim terminus / Track transfer to connections Central Link between lines Maintenance facility connection Tie-in to existing IDS and DSTT SODO Segment Operational Needs
Operating plan Everett to West Seattle via Downtown Seattle Transit Tunnel Everett to Downtown Redmond via Downtown Seattle Transit Tunnel Ballard to Tacoma via new rail-only tunnel
Spine EVERETT segmentation Splits long trips from 2 HOURS Tacoma to Everett vs. TACOMA
to Everett Balanced loads Balances passenger Existing Existing loads, enabling future DSTT DSTT growth vs. New New All users benefit from tunnel tunnel core capacity to West to Redmond Seattle expansion to Tacoma
Maintenance facility connection Accommodate connection from West Seattle Link to to Tacoma existing maintenance facility at Forest Street to West Seattle
Tie-in to existing DSTT Int’l District/ Chinatown Existing DSTT Connect to existing DSTT International District/ Chinatown Station to Tacoma to West Seattle
Interim terminus / to Seattle, Lynnwood and Eastside transfer to Central Link Accommodate interim 2030 transfer to northbound to Tacoma SODO Central Link and permanent transfer to to West southbound Central Link Seattle
Track connections Int’l District/ between lines Chinatown Accommodate track connections between West Seattle Link and Ballard Link to Tacoma SODO to allow for movement of trains and failure to West management Seattle
SODO community Operational concerns needs SODO station transfer Maintenance facility connection E-3 busway utilization Tie-in to DSTT Service to SODO destinations Interim terminus Freight mobility Track connections Safety
SODO route ideas from agency workshop
Serve development on 1 st Ave S Freight mobility on 1 st Interaction with BNSF corridor Facilitate Crossing safety south crossing Traffic impacts on 4 th Good transfers Potential opportunities on 6 th Ave S Agency workshop concerns/issues
Potential alternatives from agency workshop
New SODO Level 1 Alternatives
Long-span Long-span crossing over crossing over BNSF tracks BNSF tracks Property impacts of crossing Traffic and freight access impacts on Occidental Ave Occidental Ave – Key Findings
Traffic and freight access impacts on 6 th Ave OMF connection Property impacts to locate Construction challenges technically SODO Station adjacent to and service disruptions challenging existing station 6 th Ave – Key Findings
Other suggestions – “Track interlining”
Headways on both lines requires grade separation of junctions and impacts continued E-3 use by buses Funneling both lines together creates bottleneck impacting entire network and reduces future service capacity Other suggestions – “Track interlining”
Track interlining – Forest Street junction
Track interlining – Stadium junction
Other suggestions –“Extended Ballard line”
Additional length of elevated guideway No track connections between lines Deep piles under King Extended service Street Station, 4 th Ave disruption and cost to Viaduct, Union Station, IDS rebuild Forest Street elevated structure Other suggestions –“Extended Ballard line”
SODO Level 1 Alternatives – Evaluation Results Evaluation Criteria and Measures ST3 Representative Project (Baseline) Massachusetts Tunnel Portal Surface E-3 Occidental Avenue 6th Avenue Higher Performance Comparable Performance Lower Performance
SODO Level 1 Alternatives – Evaluation Results Evaluation Criteria and Measures Long-span BNSF crossing Enhanced from Occidental; OMF Not able to access to connection; property impacts provide all additional SODO required special destinations trackwork ST3 Representative Project Traffic and freight (Baseline) impacts from Massachusetts Tunnel alignment in Portal Occidental/6 th Ave street ROW Surface E-3 Occidental Ave 6 th Ave Degraded Higher Performance Comparable Performance Lower Performance transfer at SODO Station
E-3 Busway – Existing Bus Volumes (PM Peak Hour)
Confirm extent of potential Confirm future bus Ryerson Base capacity impacts volumes expected to use E-3 corridor Assess potential 6th Ave Confirm extent of future roadway improvements to bus layover needs accommodate bus use E-3 Busway – Level 2 technical work On-going discussions with partner agencies
Integration of local bus service Pedestrian and bicycle access SODO trail access SODO station access technical work
SODO and Stadium station Continued WSDOT design charrette: transit connections and coordination: avoid WSDOT ramp other station access improvements column and foundation conflicts Continued SDOT coordination: Continued SCL coordination: grade crossings at Lander and transmission line relocation issues Holgate, Royal Brougham closure Level 2 – other technical work activities
SODO Alternatives Summary – Level 1 ST3 Representative • Baseline for comparison Project Alternatives with • Moved forward to Level 2 Surface E-3 more potential Massachusetts Tunnel • Moved forward to Level 2 Portal • Long-span elevated crossing over BNSF tracks • Traffic and freight access effects on Occidental Ave Occidental Ave Alternatives with • Property impacts of alignment crossing from Occidental Ave to Stadium Station greater challenges • OMF connection technically challenging • Property impacts to locate SODO Station adjacent to existing station 6th Ave • Braiding lines could have major construction challenges and service disruptions • Requires grade-separated junctions; does not accommodate buses on E-3 “Track interlining” • Creates bottleneck; impacts service reliability and limits system capacity Not practical concepts • Rebuild of Forest St junction requires disruption of existing LRT service • Deep mined C-ID station; constructability challenges “Extended Ballard line” • Additional guideway length; no track connections 42
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