What to expect

What to expect

Being a good neighbor during construction

WSDOT and Graham recognize that people living, working or traveling through a complex project are those most affected by the work. While some inconvenience from SR 520 construction is unavoidable, we strive to minimize effects on neighbors as much as possible.

Boat, canoe and kayak restrictions on Lake Washington during construction

Boating safety

During certain periods of construction, cranes and other equipment will limit water access under SR 520 bridges.

  • One navigation channel by the floating bridge may be blocked periodically.
  • At least one navigation channel will always be open to boaters.
  • During these blockages, boaters should navigate through the open channel.

Photo of workers in boats.

Do not cross barriers.

Kayak/canoe safety

Canoe and kayak landings in the area are open. Stay 100 feet from construction.

Navigation map for kayaks and canoes.

Click image to magnify.

How will access be restricted?

Signs will be posted at all construction zone entrances. One navigation channel by the floating bridge will be open at all times.

Construction on Lake Washington

The Montlake Project will require crews to work both in and over Lake Washington.

Crews will:

  • Remove sections of the old bridge to make room for the temporary work trestles.
  • Construct the temporary work trestles on both sides of the old bridge to support gantry cranes.
  • Construct the eastbound bridge.

Image of the Montlake area looking west.

Click image to magnify.

Crews will work from temporary work trestles in the shallower waters and use barges in the deeper waters.

Illustration showing temporary structure to be used during construction.

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The gantry cranes allow crews to remove pieces of the old bridge and construct the new bridge. The removed pieces of the old bridge will be demolished off-site. This approach reduces the environmental risk to Lake Washington and disruptions to nearby neighbors.

Nighttime construction

Graham will perform nighttime work under a City of Seattle-approved Major Public Project Construction Noise Variance. The variance sets limits for nighttime construction noise for the duration of construction.

How are nighttime noise restrictions monitored and enforced?

How are nighttime noise restrictions monitored and enforced?

  • Electronic noise meters record noise levels 24 hours per day.
  • Weekly and annual noise monitoring reports are provided to the Seattle Department of Construction and Inspections and are available to the public.
  • A WSDOT-assigned independent noise inspector is on site during all nighttime work to report any violations or neighborhood complaints to the Seattle Department of Construction and Inspections. Residents can report noise complaints to the 24-hour hotline: 206-775-8885.
How will crews reduce noise?

How will crews reduce noise?

  • Strict noise restrictions on jackhammers and other impact equipment between 5 p.m. and 8 a.m.
  • Not allowing trucks to idle longer than a few minutes.
  • Prohibiting pure-tone backup warning devices after 10┬áp.m.
  • Requiring the use of radios for long-range communications.
  • Designating haul routes that can reduce noise impacts caused by trucks.
  • Controlling noise at the source by using less noisy equipment and/or muffling the equipment.

    Nighttime hours when variance is applicable:

    Weekdays: 10 p.m. to 7 a.m.
    Weekends and holidays: 10 p.m. to 9 a.m.

    Construction vibration

    Some residents in the Montlake and Madison Park neighborhoods may notice vibrations when crews perform certain work during Montlake Project construction.

    Vibration monitoring

    Vibration monitoring

    • Graham has installed vibration monitors around Montlake and Madison Park. The vibration monitors provide Graham and WSDOT with necessary data to track and monitor vibration levels.
    • WSDOT will provide home inspections to neighborhood homeowners depending on location and nearby construction activities. Interested neighbors can request an inspection by calling the project hotline 206-775-8885.
    Vibration-producing equipment and activities

    Vibration-producing equipment and activities

    • Vibratory and impact hammers used for pile installation and drilling shafts.
    • Hoe-rams and munchers used for structure removal.
    • Excavators used for digging and trenching.
    • Vibratory rollers used for paving.
    • Concrete and flatbed trucks.