Grand Parkway Bridges


Texas Department of Transportation/Harris County Tollroad Authority


Number of Spans: 18 main lanes / 8 and 9 entrance and exit ramps

Span Length: main lanes 219 to 104 feet / ramps 85 to 66 feet

Structure Type: texas prestressed concrete girders

Grand Parkway Bridges


Upon completion, the Grand Parkway (SH99) will be the longest beltway in the country with180+ miles traversing seven counties that will encircle the greater Houston area. For one of the eleven segments comprising the design of this tollway, Walter P Moore designed two main lane bridges in west Houston over Clay Road and Mayde Creek as well as two ramps over Mayde Creek. The two main lane bridges are approximately ½ mile long and carry two lanes of traffic with shoulders. The two ramps tie into the main lane bridges to carry traffic between Clay Road and the tollway. The superstructure for the two main lane bridges and the ramps were designed as Texas pre-stressed concrete girders. The substructure utilized the Texas Department of Transportation (TxDOT) Houston District Green Ribbon aesthetic design for the columns and the standard TxDOT hammerhead bent cap shape. Due to projected travel volumes of the tollway, the main lane bridges were designed for the anticipated future widening of the roadway. WPM is proud to participate in the design of the third loop of Houston that will make the growing metroplex even easier to travel.