The Chesapeake Bay Bridge consists of two parallel spans, each approximately 4.3 miles (about 6.4 km) long. The original eastbound span is about 4.3 miles in length, and the newer westbound span, built alongside it, is also about 4.3 miles long

. This makes the total crossing roughly 4.3 miles per span, serving as a vital connection across the Chesapeake Bay in Maryland.