 In Merrimack, nighttime lane closures are in effect on the Everett Turnpike between exits 12 and 13. In Dover, River Street is closed for the summer months related to work on the Dover Waterfront Project. In Durham, construction work continues on Madberry Road, and there will be temporary daytime road closures on the Route 12A bridge in Claremont over the Sugar Hill River. That bridge will totally close today and tomorrow. A detour will be in place from 7 a.m. to 7 p.m. Also in Dover, a section of mass road down to a single lane for the next eight weeks near the Public Works facility.