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SR 520 - Floating Bridge and Landings Project: Boater Information

Key resources for drivers and boaters

SR 520 Bridge Information page

More info on WSDOT movable bridges

Updated: August 3, 2016

Construction activities continue near SR 520

Due to the volume of construction activities taking place near the floating bridge and near the new West Approach Bridge North, boaters should be vigilant and boat with care. Using appropriate boater etiquette and following speed limits near construction activities will keep both boaters and construction crews safe.

The east and west navigation channels will be periodically blocked for critical construction activities. During these blockages, marine vessels should plan to navigate through the unaffected channel (see below for navigational height restrictions).

To receive updates about upcoming blockages of the navigation channels, email us.

Information for Seafair 2016

With increased boat traffic expected this weekend for Seafair, we want to remind you to take care when traveling near the new and old 520 floating bridges and construction for the West Approach Bridge North. When boating near the bridges:

  • Please watch for cranes and crews as a lot of work is occurring
  • DO NOT GO UNDER construction equipment, especially cranes that are actively lifting/moving materials
  • More changes are coming as decommissioning activities will change the boating landscape around the bridge. Information on what to expect will be posted on this page early next week.

East Navigation Channel

There are no east navigation channel closures at this time.

New east navigation channel open at full height of 70 feet 

While the east navigation channel is open at its full height of 70 feet it is important to note that there may be interim closures throughout the summer as crews continue to decommission the remainder of the old SR 520 floating bridge.

West navigation channel temporarily closed from Monday, Aug. 8 through Wednesday, Aug. 31

The west navigation channel will be closed to marine traffic through from Monday, Aug. 8 through Wednesday, Aug. 31. All vessels at or under 70 feet will be able to transit through the east navigation channel.

The east navigation channel will be open at this time, at its full, permanent height of 70 feet. See Section A in the graphic below.  
Nav channel blockages
Click image for printable version.  (pdf 1.8 mb)  

Navigation channel calendar

Nav channel calendar
Click image for printable version. (pdf 48 kb)


SR 520 navigation channel restrictions

An exclusion zone is active immediately north and south of the western-most pontoon. This off-limits zone is marked by six white buoys and a sign on each end of the pontoon. Please note, the white buoys represent the locations of the anchor lines and it is dangerous to pass between the sign and the buoys.

Please note that the U.S. Coast Guard has established a temporary safety zone around the east span of the SR 520 floating bridge through the end of December 2016. During this time, boaters are prohibited from entering all waters within 100 yards of the east span, unless within the navigation channel. This zone is in place to protect boaters and bridge crews while construction barges are located in the navigation channel under the east span of the bridge.