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SR 520 - News and Updates

Jan. 9, 2017 | WABN Construction Update

Learn about upcoming construction activities and project updates in the latest SR 520 West Approach Bridge North Project Construction Update.

Jan. 10, 2017 | SR 520 News of the Week

UPDATE: Nighttime westbound SR 520 closure tonight, Tuesday, Jan. 10

Yesterday’s cold temperatures and rain caused planned Monday night concrete pours to be postponed. Crews now plan to close all westbound SR 520 lanes and ramps between 92nd Avenue Northeast and Montlake Boulevard and the bicycle/pedestrian path along the floating bridge from: 

  • 11 p.m. Tuesday, Jan. 10, to 5 a.m. Wednesday, Jan. 11.

Please note that from 9 to 11 p.m. Tuesday and 5 to 6 a.m. Wednesday, crews will funnel westbound traffic down to one lane on the floating bridge for preparation and cleanup of concrete pours.

Westbound closure graphic
Click for larger version

Late-night and early-morning travelers should plan to take I-90 or drive around Lake Washington if heading to Seattle from the Eastside.

Weather this time of year makes it a bit tricky to confirm our work schedules in advance but we will continue to send updates as soon as we can to let you know of any changes in scheduled closure dates.

All closure information is also kept up to date on our SR 520 Orange Page, and you can receive the most up-to-date closure notifications by following our SR 520 Twitter feed.

Full closure of SR 520 planned for the weekend of Jan. 27-30

Crews are continuing to work on removal of the old westbound SR 520 off-ramp that extends over the highway near Montlake. So far they have removed five of eight girders – the steel beams that support the bridge’s roadway – with three more girders scheduled to be removed by the end of the month. To safely complete this work, crews plan to close all lanes and ramps of SR 520, as well as the new floating bridge’s bicycle/pedestrian path, between 92nd Avenue Northeast and Montlake Boulevard from:

  • 11 p.m. Friday, Jan. 27, to 5 a.m. Monday, Jan. 30.

We will send further reminders and information about this closure in coming weeks.

Full closure graphicClick for larger version

Project updates: Out with the old, in with the New Year

Floating bridge

Floating bridge pontoons being towed by a tugboatIf you have not yet had the chance, check out the history in motion on Lake Washington. Only three of 31 old floating bridge pontoons are still floating near their old residence, and later this week, each of these 53-year-old pontoons will be escorted from Lake Washington via the Lake Washington Ship Canal before passing through the Hiram M. Chittenden (Ballard) Locks. Once through the locks, the pontoons are turned over to a third-party wholesaler for reuse.

Over the next few days, the following old floating bridge pontoons will take their final voyage:

  • Pontoon Z is planned to depart at 2 p.m. Wednesday, Jan. 11.
  • Pontoon B is planned to depart at 2 p.m. Thursday, Jan. 12.
  • Pontoon N (with the lift-span) is planned to depart Saturday, Jan. 14.

If you are interested in seeing the final float-outs, you can track the accompanying tugboats Terilyn and Mudcat using a boat-tracker app or website such as MarineTraffic, and watch the float-outs from these suggested viewing locations.

Departure timings and tugboats are subject to change; please follow the SR 520 Twitter account for the most up-to-date float-out information.

West Approach Bridge North

West Approach Bridge North girdersNo need for a gym! Only one week into the new year, the West Approach Bridge North (WABN) is already making big changes in its physique. On Thursday Jan. 5, crews installed the 353rd girder – marking the completion of all girder installation for the final WABN structure.

With this final girder in place and more than 50 percent of the roadway deck placed, crews will begin taking down the temporary, wooden work bridge they worked from while building the WABN foundation. Crews will continue construction from the new WABN structure as they work to complete the new bridge by this summer.