Mariner
Key features
- All stations and routes would be elevated.
- Community Transit serves this area with local buses and the Swift Green Line.
- The Mariner Park-and-Ride lot is west of I-5 and south of 128th St SW.
- Approximately 550 new parking spaces are being studied at this station, but final design and construction of parking is deferred.
- No preferred alternative was identified for this segment.
Map showing the Mariner segment from the Ash Way segment in the south to the State Route 99/ Airport Road Segment in the north. There are 2 route and station alternatives. The MAR-1 route alternative starts along the westside of I-5 before a wide left turn takes the elevated route along the southside of 128th Southwest. The MAR-2 route alternative connects to Station MAR D south of 128th Street Southwest then runs along the northside of 128th Street Southwest.
The Mariner segment stretches from about 134th St SW to the area south of SR 99.
Map showing community locations and context of the surrounding neighborhood near the Mariner segment. Key landmarks are Windstone Apartments (HUD-Assisted), Pellegrini Orthodontics, Safeway, and the Future mariner Community Campus. The Swift Bus Rapid transit route runs along 128th Street SW. Some small wetlands areas are nearby but not impacted by either route.
Community features in the Mariner segment shown in relation to the station and route alternatives.
Alternatives
MAR-1B (South of 128th Street Alignment with 8th Avenue Station)
Alternative MAR-1B consists of Alignment MAR-1 and Station MAR-B.
Alignment: MAR-1 would run elevated on the west side of I-5 and turn west near 128th St SW, continuing elevated along the south side of 128th St SW before going briefly to at-grade east of Gibson Road and returning to elevated along the southwest side of Airport Road. The height of the guideway would range between at-grade and approximately 70 feet high.
Station: Station MAR-B would be an elevated station in the vicinity of 8th Ave W. The station canopy would be approximately 80 feet above the ground and would require an intermediate landing, sometimes called a mezzanine, below the platforms. Parking for Station MAR-B would be located in two parking structures, one adjacent to the station platform at the corner of 128th St SW and 8th Ave W and another along 4th Ave W, across from the existing Mariner Park-and-Ride.
Map showing a station layout for MAR-1B, located on the southeast corner of 128th Street Southwest and 8th Avenue West. Bus bays are located onsite and on street. Paratransit, microtransit, pickup and dropoff spaces are all located on site. There are 2 areas for potential future use.
Station layout for station alternative MAR-B, an elevated station located on the south side of 128th St SW at the intersection with 8th Ave W.
MAR-2D (North of 128th Street Alignment with Mariner Park-and-Ride Station)
Alternative MAR-2D consists of Alignment MAR-2 and Station MAR-D.
Alignment: MAR-2 would run elevated roughly parallel to 4th Ave W. The guideway would turn west and cross over 128th St SW near 8th Ave W where it would transition briefly to an at-grade profile before returning to elevated along the northeast side of Airport Road. The height of the guideway would range between at-grade and approximately 55 feet high.
Station: Station MAR-D would be an elevated station in the vicinity of Mariner Park-and-Ride. The station canopy would be approximately 65 feet above the ground. Parking for Station MAR-D would be located in a parking structure at the existing Mariner Park-and-Ride.
Map showing a station layout for MAR-2D, located to the west of the Mariner park and ride, near the Safeway. Bus bays, paratransit, microtransit, and pickup and dropoff spaces are all on site. There is a large area for potential future use to the east.
Station layout for station alternative MAR-D, an elevated station between 4th Ave W and 8th Ave W across the street from Mariner Park-and-Ride.
Surface parking design option
Each station alternative has a design option for a surface parking lot instead of a parking structure. For Station MAR-B, the surface parking design option would be located at the corner of 4th Ave W and 132nd St SW across from the existing Mariner Park-and-Ride. For Station MAR-D, the surface parking design option would be located in two lots: one at the corner of 4th Ave W and 132nd St SW across from the existing Mariner Park-and-Ride and another on the south side of 132nd St SW. The parking design options for Stations MAR-B and MAR-D are shown in the maps below.
Map showing the Mariner segment with proposed parking along the MAR-1 route alternative. The parking includes a small structured parking and more surface parking near station alternative MAR-1B.
A map of Alternative MAR-1B showing potential future parking options.
Map showing the Mariner segment with proposed parking along the MAR-2 route alternative. The parking includes a small structured parking and 2 surface parking lots near station alternative MAR-2D.
A map of Alternative MAR-2D showing potential future parking options.
Potential design refinements
- Explore moving the
turnback
from the Mariner segment to Ash Way segment. This option would terminate the 2 Line at Ash Way instead of Mariner. This would keep the tracks within existing right-of-way with fewer private properties affected.
- Explore moving the I-5 crossover farther from the residential area to reduce noise impacts.
Alternatives summary table
This table summarizes some of the key findings in the Draft EIS Executive Summary. To review the detailed summary of findings, visit Section 4.3.2.4 and Table 4-31 of the Draft EIS.
Summary of potential effects – Mariner Segment
Notes:
a) Numbers or descriptions presented in this table are for permanent or long-term impacts, except where a construction impact is noted. Each alignment alternative is compatible with all alignment alternatives in the adjacent segments. The ranges of displacements reflect the various connections to the adjacent segments.
b) Opinions of probable cost are in 2025 dollars, are for comparative purposes only, and do not represent the project budget. The opinion of probable cost for the Mariner alternatives does not include cost for parking.
Please note that the information contained in the table is repeated in an outlined list below. There is no difference from the content shared in the table. It is provided in two different formats so the information is accessible to everyone.
The summary of impacts is organized by Resource Impact Measure.
Potential street closures during construction
- All alternatives: Local road closures including 4th Avenue W and the south side of 128th Street W.
Number of potential residential displacements
- MAR-1B with structured parking and MAR-1B with surface parking design option: 300.
- MAR-2D with structured parking and MAR-2D with surface parking design option: 287.
Number of potential business displacements
- MAR-1B with structured parking and MAR-1B with surface parking design option: 68.
- MAR-2D with structured parking and MAR-2D with surface parking design option: 45-46.
Displaced social resources/community facilities
- MAR-1B with structured parking and MAR-1B with surface parking design option: Mariner Library, Royal Party Hall, Katya’s Bakery, Oriental & African Mini Market, Dollar Tree, Safeway, and Arriba Mexico Store y Oaxaca Galmen.
- MAR-2D with structured parking and MAR-2D with surface parking design option: Oriental & African Mini Market, Dollar Tree, several buildings within Windstone (HUD-assisted) Apartments, and Pellegrini Orthodontics.
Ecosystems impacts
- MAR-1B with structured parking and MAR-1B with surface parking design option: 0.1 acres of wetlands, 50 linear feet of streams, and 0.7 acres of open space upland habitats.
- MAR-2D with structured parking and MAR-2D with Surface Parking Design Option: 0.3 acres of wetlands, 50 linear feet of streams, and 0.2 acres of open space upland habitats.
- Number of historic properties with potential adverse effects.
- All alternatives: None.
Number of historic properties with potential adverse effects
Opinion of probable cost in millions
- MAR-1B with structured parking and MAR-1B with surface parking design option: $1,220 – 1,370.
- MAR-2D with structured parking: $920 – 1,040.
- MAR-2D with surface parking design option: $910 – 1,020.
To leave a comment on the Draft EIS or the project alternatives, please fill out our Draft EIS comment form/survey. You can also learn more about what type of comments we’re looking for, how to comment, and where to comment on the Comment now page.
