The Negative Declaration for the expansion of US 113 from the north end of the Frederica bypass to US 113 Alternate at Little Heaven was issued in 1975, and construction began that same year. The Frederica–Little Heaven divided highway was completed in 1977. Design work for the divided highway from Little Heaven to Dover Air Force Base began as early as 1964, and considerable planning and design work was done before that work came to a halt in the 1970s. In addition to the environmental effects of the highway crossing a large marsh, which required DelDOT to produce a draft environmental impact statement, DelDOT needed to coordinate with the U.S. Coast Guard to construct a new bridge across the St. Jones River. US 113 was finally expanded to a divided highway, including a four-lane bridge across the St. Jones River, by 1985. The final stretch of two-lane US 113 in Delaware was eliminated when the second carriageway was added to the highway from Bedford Street in Georgetown to north of Lincoln in 1995 and 1996. This expansion, in particular a section near Ellendale, was included in a Federal Highway Administration pavement study.