The Aquarena Springs Drive overpass that has been under construction since June 2015 officially opened Monday. The $20.7 million project is substantially complete. Texas Department of Transportation spokesperson Christopher Bishop said minor construction work such as landscaping and cleanup work, along with road closures, are still ahead. TxDOT partnered with the city of San Marcos on the project. The four-lane overpass is between Thorpe Lane and Charles Austin Drive over the Union Pacific Railroad tracks. Two access lanes in each direction are located on either side of the overpass.