 In Dover, River Street is closed for the summer months related to work on the Dover Waterfront Project. Also in Dover, Portland Avenue is a single lane between Cochico and Chapel Streets until the end of September. In Durham, construction work continues on Madberry Road. And in Merrimack, nighttime lane closures are in effect on the Everett Turnpike between exits 12 and 13. And traffic will be impacted for most of the summer months.