The Texas Department of Transportation is set to launch one of Austin’s largest underground construction projects in 2026, digging 6.5 miles of 22-foot-wide tunnels beneath the city’s busiest highway. As part of the I-35 overhaul in Central Austin, which will lower sections of the highway below ground level, the transportation agency will build underground drainage tunnels to help prevent flooding along the corridor (see map).
Full article here: TxDOT spends $748M to burrow bus-size tunnels under Central Austin
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