Motorists using Mount Si Road in North Bend should watch for changing travel conditions over the next several weeks.

The King County Road Services Division is replacing the 94-year-old bridge across the Middle Fork of the Snoqualmie River with a newer and wider bridge. Right now, construction of the new bridge and pre-demolition of the old bridge are going on at the same time.

The pavement on the approaches of the old bridge was pulverized last weekend to prepare for demolition, and motorists will be driving on loose gravel for two weeks. Then, in the late afternoon on Monday, July 28 traffic will be switched over to the new bridge and its approaches.

Crews will still be working on both bridges simultaneously. Motorists are urged to drive with caution through the construction area.