Updated: April 5, 2017
Construction activities continue near SR 520
Due to the volume of construction activities taking place near the new West Approach Bridge North, boaters should be vigilant and navigate 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 are currently open, but may 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). Please note that one navigation channel will always be open and accessible to boaters.
To receive updates about upcoming blockages of the navigation channels, email us.
Navigation changes on Lake Washington at SR 520. Click image for printable version (pdf 1.4 GB).
While all of the pontoons and much of the other marine equipment has been removed from the lake, mariners should continue to maintain a safe distance and minimize wake around all floating derrick (crane) barges and other construction vessels within the SR 520 project area.
Mariners are advised to use caution while transiting near derrick barges and work barges within the SR520 project area. These vessels are currently anchored and may present submerged hazards. Work zones around some derrick barges have been marked with red/white buoy strings. Mariners should maintain a safe distance and minimize wake around all floating derrick barges and other construction vessels.
East navigation channel clearance under the new SR 520 floating bridge
At the east navigation channel, boaters will see two signs indicating clearance. Both signs are gauges posted at the water level to show the clearance for boaters at the current water level. The graphic below shows the east navigation channel clearance under the new SR 520 floating bridge.
The only sign currently posted on the bridge is on the pontoon located at the west side of the channel. While this sign is a gauge, as shown below, this sign will always show a clearance of 70 feet at water level since the pontoon rises and falls with changes in water levels on Lake Washington.
A sign will be posted on the fixed, east approach column at the east side of the channel. The clearance is 65 feet at the east end of the channel so boaters will see that portion of the sign at water level. As water levels lower, the clearance on the east side of the channel may rise up to approximately 67 feet.
East navigation channel height of the new SR 520 floating bridge. Click on the image above for a larger, printable version (pdf 6.3 mb).
The new SR 520 floating bridge has nautical mile markers to indicate distance for boaters on Lake Washington. The markers are placed on both the north and south side of the bridge. The graphic linked below shows the layout for the nautical mile markers.
Click on the image above for a larger, printable version (pdf 4.16 mb).