 US 113 was widened into a divided highway from north of Milford to south of Frederica and around Dover Air Force Base in 1959 . A four @-@ lane divided bypass to the east of Frederica was constructed in 1965 . US 113 between Frederica and Little Heaven was expanded in 1975 . US 113 between Little Heaven and Dover Air Force Base was expanded to a divided highway in 1984 and 1985 ; this project included replacing the two @-@ lane drawbridge over the St. Jones River with a four @-@ lane girder bridge . 
