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I-5 – NB S 260th to Duwamish River Bridge – Concrete Pavement Rehab and ADA - Challenges

What are the challenges we face?

Lane reductions: Most of the work will be done during nighttime lane reductions. However, some of the work will require weekend-long lane reductions, when northbound I-5 will be limited to two lanes. Work on southbound I-5 during the summer of 2016 utilized this type of lane reductions.

Ten of 12 weekends requiring lane reductions on northbound I-5 work are finished. 

Two weekends with lane reductions remain for expansion joint work. These are scheduled for:

  • Oct. 27-30: From 8 p.m. Friday to 5 a.m. Monday crews will replace expansion joints on northbound I-5 at the Duwamish River.

All seven of the weekends for paving between SR 516 and South 170th Street are finished. Crews also finished paving the bridge decks at Interurban Avenue and the Duwamish River.

Weather: Paving work must be done when the weather is dry and the temperature is at least 45 degrees, which means paving generally must be done during summer or early fall. 

Paving asphalt over long sections of concrete: A 4-mile section of northbound I-5 from SR 516 to about South 170th Street had hundreds of broken panels. Rather than remove and replace all of these, crews used a method called crack, seat and overlay to resurface this section. Crews used heavy machinery to break the concrete panels, then compacted those broken panels. Then they paved 8 inches of asphalt on top to provide a smooth driving surface. 

Noise: Grinding and crack, seat and overlay work is noisy and can cause vibrations. People who live or work near northbound I-5 may hear or feel it.