Dallas Downtown skyline at sunset

Trinity Corridor Transportation Improvements

The Trinity Parkway Corridor Transportation Improvements will be implemented jointly by the Texas Department of Transportation (TxDOT), the North Texas Tollway Authority (NTTA) and the City of Dallas.

The City will participate in the financing of the Trinity Parkway, a 6/4 lane tollway reliever route extending in the south from U.S. 175 to connect with S.H. 183 in the area of IH-35E in the north.  The locally preferred alternative, identified in the Trinity River Corridor Balanced Vision Plan, proposes that the Parkway be constructed with all lanes on the inside of the levee closest to downtown. Dallas City Council approved this alignment on April 13, 2005, and it was adopted by the NTTA Board of Directors on April 20, 2005. The roadway will be built on an embankment which will raise it above the 100-year floodplain, or will be protected from the 100-year flood by floodwalls in those areas where the roadway must fall below the 100-year floodplain to go below the various bridges.   The NTTA is currently conducting an Environmental Impact Statement (EIS) to evaluate this alternative and its environmental impacts.  This EIS is being done in conjunction with the Corps of Engineers Dallas Floodway EIS, which looks at the combined impacts of the roadway, lakes and river channels in the downtown floodway area. Construction of the parkway will utilize material excavated from the proposed lakes and wetlands identified as part of the City of Dallas' master plan for the existing Dallas Floodway. An official "Record of Decision" is expected for the Parkway EIS in 2008, and construction could be completed in 2013.

The construction of the Trinity Parkway reliever route facilitates TxDOT efforts in completing improvements to IH-30 and IH-35E (Canyon/Mixmaster/Lower Stemmons).  The IH-30/IH-35E improvements are proposed to be completed on an accelerated 15-year schedule. The work includes main lane and frontage road improvements, direct connections between IH-30 and IH-35E, and high occupancy vehicle (HOV) lanes.  It is also proposed that TxDOT extend the Woodall Rodgers Freeway  across the Trinity River to Singleton/Beckley Avenue. This will act as an integral part of the reliever system, providing access to the Trinity Parkway, Oak Cliff, and West Dallas. The Woodall Rodgers crossing of the Trinity River is proposed to be constructed as a "signature" bridge which could be a custom designed arch structure intended to be a landmark for the City. Design for this bridge, known as the Margaret Hunt Hill Bridge, is complete and construction should begin in March 2007. The IH-30 bridge is also being designed as a signature structure.

Next Steps

Project Update