Delaware Department of Transportation’s US13 Blackbird Creek Bridge project replaced two bridges; Bridge 1-488N – a 40-foot-long concrete rigid frame structure originally built in 1933 – and Bridge 1-488S, a 42-foot-long concrete arch structure originally built in 1920. This project improved safety by addressing scour risks caused by undersized bridge spans that constricted the stream, as well as their location at the bottom of a steep road dip.  Furthermore, the roadway profile at the bridges was substandard for stopping sight distance, leading to a high crash rate for vehicles merging onto U.S. 13. Early in the design process, engineers evaluated several bridge structure options, including CON/SPAN arches (precast concrete arch systems), NEXT Beams (Northeast Extreme Tee prestressed concrete beams), and standard prestressed concrete girders (PCEF) with cast-in-place concrete decks. However, to support accelerated construction and raise U.S. 13 by about 8.5 feet to improve sight distance and safety, Delaware DOT replaced the bridges with stronger structures designed for a 100year service life. Costing $15.53 million, Delaware DOT also used accelerated bridge construction techniques for the replacement of Bridges 1-488N and 1-488S in 43 calendar days and 37 calendar days, respectively. Without the use of these systems, a more traditional bridge replacement project would have taken up to a year to complete the replacement of both bridge structures – with this project significantly saving the state time and money.