The portion of the parkway between U.S. Route 1 and State Road 3 is designated NASA Parkway West and also known as NASA Causeway West. Although the designation of Florida State Route 405 begins further inland, the Parkway itself begins on the mainland when Columbia Boulevard crosses U.S. Route 1 in Titusville. Continuing eastward, NASA Parkway West crosses the Indian River Lagoon. A bascule bridge permits boats on the Intracoastal Waterway to pass through the causeway. Continuing eastward, approximately mile (km), it enters the Merritt Island National Wildlife Refuge and the John F. Kennedy Space Center near its intersection with Space Commerce Way (also known as Government Road). At this point, the Merritt Island peninsula is at its widest and about mile (km) wide, permitting the Parkway