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SR 520 Orange Page
Community Construction and Closure Updates

Welcome to the SR 520 Orange Page, your go-to resource for all SR 520 construction updates and community construction management information.

How to use this page:

Note: This tool is presented for planning purposes only. Construction work is inherently dependent on weather and other factors, and activities are subject to change.

Project information

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Construction Best Practices

Replacement of the SR 520 floating bridge and highway requires major construction activities that affect those who live, work and play nearby. As WSDOT, we require our contractors to implement industry-accepted best management practices to minimize the effects of project construction on highway users and neighbors. Read on to learn more about how we’re managing certain types of construction effects.

To maintain noise levels below thresholds established by local jurisdictions, the contractor implements measures to reduce excessive noise, especially during nighttime work. These measures may include muffling exhaust pipes, minimizing truck noises and idling, using noise shields when practical, and limiting nighttime work operations to less noisy activities.

Dust and Air Quality
To control dust, the contractor stabilizes exposed dirt surfaces and contains soil-disturbing operations. These measures may include the use of sprayed water, tarp covers for truck loads, tire washes, and placing gravel at ingress and egress points. To control air quality, the contractor uses efficient and modern equipment with appropriate emission-control devices. Any paint spraying or sandblasting activities are implemented by trained personnel using containment measures.

Lane control and detours
WSDOT and the contractor work closely with all local jurisdictions affected by planned road closures. Prior to any closure, detours and signage will be put in place. Additional notification to the public and local media will also be provided.

Erosion control
The contractor uses several measures to control soil erosion. These measures may include planting vegetation, installing plastic covering and erosion control fabrics, early application of a gravel base on areas to be paved, and protecting drain inlets. The contractor ensures the maintenance of these measures throughout the duration of the project.

Prior to construction, WSDOT performs vibration analysis in the project area to identify vulnerable structures. During construction, WSDOT or the contractor monitor vibrations and analyze the data to ensure that any damage or concerns are quickly identified.

Haul routes
Prior to the use of haul routes, the contractor must develop a Neighborhood Traffic Management plan and comply with the haul route agreements outlined in the Section 106 Programmatic Agreement. WSDOT will work to identify historic properties along selected haul routes within the affected area that are potentially vulnerable to vibration. WSDOT will perform a condition assessment on potentially vulnerable properties prior to use of the haul route and again when use of that route is completed.

Marine navigation
The contractor restricts barging and in-water work activities around special dates such as Seafair and opening day of boating season. Certain in-water activities are also restricted during fish windows, fish counting, and fishing seasons. The contractor also limits nighttime activities on Lake Washington whenever practical.