Highway 37 to be closed this weekend for El Niño prep work. Here's what to know.

Drivers who rely on Highway 37 in the North Bay should expect delays, as Caltrans is closing a stretch of the roadway the entire weekend to make El Ni o-related winter storm preparations.Officials said the roadway between Mare Island in Vallejo and Sears Point in Sonoma County will be closed for 55 hours, from 10 p.m. on Friday, Oct. 23 through 5 a.m. on Monday, Oct. 26. To prepare for the weekend closure, all westbound lanes between Mare Island and Sears Point will also be closed from 7 p.m. Thursday through 4 a.m. Friday.During the closure, workers will demolish the median and install K-rail to shift both directions of traffic to the westbound lanes. Crews will then raise portions of the eastbound lanes by three feet to address flooding concerns.With very few alternate routes, Caltrans is recommending two lengthy detours around the closure.For westbound 37, drivers should take the Highway 29 / Sonoma Boulevard in Vallejo and turn right, heading towards Napa. Drivers will then follow