 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 Madbury Road. And one more note in Dover, Park Street in Dover, which borders Park and Concord Streets, will be closed for about two weeks for site work beginning today. That site work includes walkway improvements, installing two new picnic table areas,