Getting Started

Noise walls

Why do noise walls have to come down?

Construction of the guideway requires the removal of some existing Interstate-5 noise walls along the corridor. Temporary removal of existing traffic noise walls during project construction is required in select locations to make room for work activities and equipment mobilization. Removal of noise walls will begin as early as March. Sign up for construction update emails to receive more information as work approaces.

What is being done to mitigate noise?

Temporary noise barriers will be installed prior to the removal of noise walls. In some locations the portion of the noise wall being removed by the project will be replaced following construction. In other locations the portion of the noise wall being removed will be replaced in-kind following construction.

Temporary barriers will be acoustical curtains installed on chain link fence. In most areas using the 6-ft high temporary noise barriers on the edge of the construction work area closest to neighborhoods will effectively mitigate highway noise. Where this mitigation measure will not be sufficient, additional treatment at impacted residences will be used.

Specifics regarding locations and duration of temporary noise barrier locations will be available after the development of a detailed construction plan.

Tree removal

This is an illustration of the vegetation clear zone needed around the light rail alignment. The image shows a cross-section of an elevated guideway with trees of varying heights around it, all trees are at a distance and height that is permitted for safety.

Vegetation clear zone

Why do trees have to be removed?

In early 2019, Sound Transit will begin removing trees on land needed for track and guideway construction, or for construction staging.

The above diagram shows a cross section of a guideway elevated 40 feet above ground. A proposed vegetation clear zone on either side prevents branches and debris from structural interference. The clearance zone widens with height, reaching a maximum clearance buffer of 11 feet beyond the edges of the guideway. There will be no vegetation within five feet of the guideway columns. The first layer of vegetation outside of the clearance zone includes short-stature trees. Depending on species, healthy trees of any height can stand approximately 30 feet away from supports.

What is being done to replant trees?

Though construction of Lynnwood Link involves removing some trees, the reduction is only temporary. Sound Transit will plant thousands more trees than removed for the project, in some cases replanting new trees even before construction begins. The ratio of replaced to removed trees varies depending on the jurisdiction, the number, maturity and species of trees removed, and federal and state environmental regulations. Overall, Sound Transit will replant more than four times the number of trees removed.

Sound Transit works with our partners to retain as many original trees as possible while still meeting project needs. We recognize that communities strongly support trees and the benefits they provide. That’s why Sound Transit is working with cities along the rail line to create opportunities for early plantings and additional trees throughout local neighborhoods, parks and open spaces.

The survivability of newly planted trees is an important aspect of the revegetation plan. Going beyond typical industry standards, Sound Transit is partnering with the Washington State Department of Transportation to extend the standard three-year plant establishment and maintenance period—which provides for close, extended care of replanted trees—by an additional ten years. Ultimately, this 13-year effort will greatly improve the survival rates of trees planted along the alignment.

CityTrees removed*Trees replanted*
Seattle 579 6,156
Shoreline 1,419 5,893
Mountlake Terrace 2,318 7,504
Lynnwood 1,074 1,192
Total 5,390 20,745

*Estimated as of February 2019. Approximately 75 percent of the trees to removed are in the WSDOT right-of-way bordering I-5, where 77 percent of the replacement trees will be planted.

When and how will trees be removed?

Sound Transit’s contractors will remove trees along the future light rail guideway, including potentially hazardous trees that could fall across tracks and cause facility damage or injury once light rail operations begin. Contractors will also remove invasive species such as blackberries and ivy in select locations to create suitable areas for planting new vegetation. To the greatest extent feasible, Sound Transit will select native, adaptive plant and tree species for replacement. Sound Transit will plant larger trees rather than saplings, and together with irrigation and the extended plant establishment period, will result higher survival rates than the smaller trees used on past projects. Trees cut for the Lynnwood Link Extension can be used as timber, mulch, compost or other wood by-products.

Building demolition

An active construction work zone is surrounded by chainlink fence. Inside the work zone are two excavators gathering up materials from a demolished building.

Example of building demolition work

Why is building demolition needed?

Demolition work is an important step in construction of Lynnwood Link Extension. It will help clear the path for construction activities slated to begin in mid-2019 and minimize any potential unauthorized activity at these sites.

When and where will building demolition occur?

Demolition work for Lynnwood Link Extension began summer 2018 in Lynnwood on Sound Transit-owned properties adjacent to the transit center. Structures removed were the former Black Angus and McDonald’s Fine Furniture buildings on 46th Avenue West.

Additional demolition work will take place during normal daytime work hours and the crews will make every effort to minimize noise, dust and debris to the extent possible. Street and local access will be maintained during this time.

How will we know about building demolition work?

Sound Transit’s Community Outreach team will reach out to notify nearby property owners in advance of work where necessary.

What is done with demolition materials?

As part of Sound Transit’s commitment to sustainability, authorized salvage companies removed materials prior to demolition. Neighborhood plant salvage events take place when possible. Clean wood, metal, concrete or other usable demolition debris will be recycled by the contractor.

Parking changes

What parking changes are planned for future stations?

In order to make room for construction of the future Lynnwood Link Extension stations and equipment staging, commuter parking will be temporarily relocated in Shoreline, Mountlake Terrace and Lynnwood. Construction of the Shoreline South / 145th Station includes a parking garage with approximately 500 new spaces. Construction of the Shoreline North / 185th Station includes a parking garage with approximately 500 new spaces. Construction of the Lynnwood City Center Station includes a new parking structure that replaces a portion of the surface parking lot, adding approximately 500 new spaces. See below for more information on upcoming parking changes.

North Jackson Park & Ride

The North Jackson Park & Ride lot is expected to close in late spring 2019 while Sound Transit begins to build the Shoreline South/145th Station and create a staging area for the Lynnwood Link Extension.

North Jackson park-and-ride will remain closed until the completion of Lynnwood Link Extension. Sound Transit will open new temporary park-and-ride lots at both Shoreline Unitarian Universalist Church and at Phillippi Presbyterian Church. The North Jackson park-and-ride location will become the new 145th Station upon completion of the project. See map above for more details.

Mountlake Terrace Transit Center Park & Ride

As early as June 2019 a portion of the Mountlake Terrace Transit Center Park & Ride surface lot will be closing while Sound Transit begins to build the Mountlake Terrace Station. Temporary parking will be located at what is currently the Roger’s Market site located at 232nd Street Southwest and 57th Avenue West. Additional information to be shared in spring 2019.

Road closures

Why are road closures needed during construction?

In order to build the Lynnwood Link Extension, construction work adjacent to Interstate-5 requires temporary road closures at various locations along the alignment.​

5th Avenue Northeast between Northeast 130th Street and Northeast 145th Street ​

Starting as early as spring 2019, the 5th Avenue Northeast roadway between Northeast 130th Street and Northeast 145th Street, along Jackson Golf Course, will close so Sound Transit crews can reinforce the shoulder adjacent to Interstate-5 to prepare for construction of the elevated guideway. Additionally, the 5th Avenue Northeast southbound lanes from Northeast 130th Street to Northeast 125th Street will be closed.

The existing pedestrian path adjacent to the Jackson Park Golf Course will remain open. Local access between Northeast 130th Street and the south end of the Jackson Park Golf Course will be maintained. Both Northeast 130th Street and Northeast 145th Street Interstate-5 off-ramps will remain open. See map above for more details.​

Future road closures ​

Additional information regarding future road closures will be avilable through construction update emails as work approaches. Sign-up today on the Welcome page.


Below are maps showing the Lynnwood Link Extension alignment in greater detail.



Mountlake Terrace