Mentioned here on Thursday that the South Park Bridge closures had been rescheduled, and that nighttime work was planned on the West Seattle Bridge next week. New details are in on both plans – read on:

From SDOT re: the West Seattle Bridge work:

Next week SDOT’s contractor will work at night on the West Seattle Bridge, leaving at least one lane of traffic open in each direction. The contractor will work from 9 p.m. to 6 a.m. each day, from Monday night, February 8 to Thursday morning, February 11.

Crews will remove and replace traffic signs, closed circuit television cameras (CCTV’s), and install a new dynamic messaging sign (DMS) to provide improved traffic information to travelers.

Motorists are asked to slow down and use caution when passing the work zone.

This work is part of the “Intelligent Transportation System” improvements that SDOT is making in several areas of the city for more efficient traffic management.

And from King County DOT on South Park:

The King County Road Service Division is advising motorists that the South Park Bridge spanning the Duwamish River will be closed to both vehicle and marine traffic from 7 a.m. – 7 p.m. daily Wednesday, Feb. 10 through Saturday, Feb. 13. The four-day closure will allow engineers to perform noise and water quality testing and simulate vibration that might occur during bridge construction.

During the closure, engineers will conduct pile driving to measure noise, vibration and take water quality samples. Data collected during the tests will assist the county in planning for construction of a new bridge when financing becomes available.

During the closure, motorists can detour via the First Avenue South Bridge. The bridge will remain open for bicycle and pedestrian use.