Tuesday, November 3, 2015

SR 520 Progress Continues On West Approach Bridge North

This information was recently posted on the SDOT site:

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Progress continues to march forward on the West Approach Bridge North

WABN structure legend
Last week, crews removed forms to reveal the first pair of completed concrete columns for the permanent West Approach Bridge North (WABN), a big milestone as this bridge begins to visibly take shape on the water. In coming weeks, crews will continue to pour more of the 93 remaining WABN columns and 61 remaining shafts. Some of this work will happen from atop the West Connection Bridge (WCB), where crews will pump concrete into in-water casings near the west end of the new floating bridge. To continue to stay up to date on WABN construction activities on Lake Washington, be sure to check out our WABN progress tracker.

Nighttime single-lane closures over coming months to build the WABN foundation. 

In order to access the West Connection Bridge and pour concrete for WABN bridge shafts, crews must close the right lane of westbound SR 520 from the floating bridge to Montlake Boulevard. These closures are anticipated to continue for the next few months from 9 p.m. to 6 a.m. on Monday through Thursday nights, and occasional Saturdays. Drivers may see lighting equipment and hear construction activities from concrete trucks near the West Connection Bridge.

Navigation channel changes on Lake Washington until early 2016
As crews install casings for WABN, there will also be changes to marine navigation in the area surrounding the WABN work site. In consultation with the U.S. Coast Guard, the northern end of the temporary west navigation channel has been narrowed by approximately 40 feet. This adjustment narrows the channel to 100 feet near the WABN construction zone to allow room for a barge from which we install casings in that area. The channel configuration will remain in place until early 2016, when the west navigation channel will move back to its permanent location.


An illustration of the new temporary west navigation channel is posted on our SR 520 Boater Information Web page. Please continue to check the SR 520 Boater Information Web page for the most up-to-date information regarding navigational changes around SR 520 on Lake Washington.

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