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Mercer Street and I-5: Closures, Noise and More!

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Over 80,000 vehicles use Mercer Street daily. In planning its massive renovation plan, the Seattle Department of Transportation (SDOT) and its partners determined that nighttime and weekend work was necessary to keep the project on time while minimizing public impact.  SDOT recently filed a Major Public Project Construction Variance (MPPCV) allowing them to work during those hours as well.  Currently being planned:

 Mercer Street lane closures on weekdays:

  • No lane closures allowed from 6 – 9 am, and from 3 – 6 pm
  • Single lane closures may be allowed from 5 – 6 am, 9 am – 3 pm, and  6- 7 pm
  • Weekday multiple lane closures may be allowed from 7 pm to 5 am

 Mercer Street lane closures on weekdays/holidays:

  • No lane closures allowed from 2 – 6 pm.
  • Single lane closures may be allowed from 6 pm – 2 pm the following day
  • Multiple lane closures will be allowed from 7 pm – 1 am

 Interstate 5 ramp entrance and exit ramp to and from Mercer St closures as follows:

  • Sunday to Thursday from 11 pm – 5 am
  • From Friday at 11 pm to Monday at 5 am

 Timing will be adjusted due to special events like Bumbershoot, the Seafair Torchlight Parade, and victory celebrations for the Seattle Storm. 

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Nighttime noise- limiting measures:

  • All trucks performing export haul shall have rubber bed liners.
  • All backup warning devices shall be either broadband or a live backup observer.
  • Hospital grade mufflers and silencers on all diesel powered equipment.
  • Lighting and equipment such as generators, air compressors, etc. shall be directed away from oncoming traffic and buildings, and have mitigation shields if necessary.
  • Radios will be used for all long-range communication.
  • Any material or debris on the pavement shall be removed by hand or by sweeping. No scraping type of equipment or activity will be used to clean pavement surfaces.
  • Moveable local noise barriers 10 – 12 feet in height, plus noise curtains will be put in place.

SDOT outreach staff will ensure the public is kept aware of any changes affecting nighttime noise levels, and that all inquiries and complaints are responded to.  A Construction Hotline has been set up and will run 24/7 as a single point of contact, and that number is 206-419-5818. This SDOT link on the Mercer project carries a lot of information including timelines, maps and construction details.

McGraw Square Renovation Underway

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The McGraw Square renovations officially began on September 24. One of the smallest parks in Seattle, it is located near the Westin Hotel at the intersection of Fifth Avenue, Stewart Street and Westlake Avenue. This project permanently closes Westlake Ave between Olive Way and Stewart St to create a transit, bicycle, and pedestrian-friendly plaza at the current terminus of the Seattle Streetcar South Lake Union line.

The goals of the new, centrally-located plaza are to make walking and biking through north downtown safer and more comfortable, while improving the transfer abilities of the Seattle Streetcar, Monorail, light rail tunnel, and major bus routes. The project also seeks to better connect the South Lake Union and Denny Triangle neighborhoods to the existing retail core, offering a “sense of place” to help orient new housing and promote economic development.

Just follow the numbers. The McGraw Square Transit Mall renovations include:

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1. A second streetcar platform to improve rider access to/from the new plaza

2. Integrated transit shelter/covered bicycle parking for up to 10 bikes

3. Landscaped rain garden to infiltrate majority of stormwater and reduce runoff entering the sewer system

4. Illuminated seat walls with signage, to act as gateway for Westlake Hub

5. ADA access, lighting, and seating improvements near the historic McGraw statue

6. Inlaid, energy efficient (LED) light tiles as part of a comprehensive dynamic, colored lighting scheme

7. Salvaged granite pavers for detailing, taken from overstock of original Westlake Park installation

8. New street trees to replace (two-for-one) those being removed near McGraw statue; new large specimen trees to anchor Westlake Ave terminus

9. Oversized curb ramp, utility connections to facilitate mobile food vending and plaza programming

SDOT is also considering converting 6th Ave between Virginia St and Westlake Ave to a two-way operation (and to relocate the charter bus zone), with the Westlake Ave to Stewart St approach reduced to a single southbound lane. The Seattle Streetcar and buses running along 5th Ave remain in full service during construction.

McGraw Square is named after John Harte McGraw. This grocer from Maine was a Seattle police chief, harbor master, fire warden, King County sheriff, and Washington State governor from 1893-97. The designer of McGraw Square and its completion date are unknown, but it was influenced by the famous park plan that John Charles Olmsted of the Olmsted Brothers firm in Brookline, Massachusetts drew up for Seattle in 1903. Their vision of the Seattle park system was to celebrate, showcase and protect Pacific Northwest landscapes while providing residents and tourists with park access and recreation.  

The McGraw project is also part of the City’s larger Center City Strategy to make Westlake one of three transportation “hubs” serving downtown (with King Street Station and Colman Dock). Construction of the plaza project is expected to be completed by Thanksgiving 2010.