GES Provided Geotechnical Recommendations for Austin TxDOT District SL-360, Pennybacker Bridge Foundations

July 2, 2021 – SL-360 in Travis County, Texas, Austin TxDOT District

This ongoing project located about 1-mile north of Pennybacker Bridge (aka the “360 Bridge”) that spans Lake Austin consists of two PS&E packages along SL-360 at Spicewood Springs Road and Lakewood Drive in Austin, Texas.

The scope of work for this project consists of 16 bridge borings and 59 retaining wall borings along SL-360. GES provided geotechnical engineering recommendations for bridge foundations, mechanically stabilized earth (MSE) retaining walls, and soil/rock nail cut retaining walls along the project alignment. The geotechnical field investigation was particularly challenging due to traffic control efforts within the active roadway, steep terrain within TxDOT right-of-way, and the very hard limestone formation. Field work, laboratory testing and engineering recommendations were provided to the design team ahead of project schedule.

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