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| All lanes are now open on the William Cannon Drive Bridge. |
Construction wraps up on the William Cannon Drive Bridge West Approach Stabilization project
Capital Delivery Services (CDS) thanks you for your patience and understanding during this important safety project. We would like to hear more about your experience during construction by participating in a short survey. For your convenience and to help with your feedback, we've provided a summary of activities below.
Bridge Stabilization
Overnight on August 25, 2022, a small portion of an eastbound travel lane on West William Cannon Drive caved in. The street damage occurred on the western approach to the bridge. The bridge deck was not impacted by the cave-in. The collapse was caused by sediment movement under the roadway asphalt which happened after the heavy rains earlier that week.
The City of Austin stabilized the Mechanically Stabilized Earth (MSE) retaining walls on the west approach, installing over 600 soil nails into the bridge’s retaining walls before adding a new layer of concrete to each wall. The sediment beneath the roadway has been stabilized to ensure safe travel conditions for decades to come.
Community Engagement
The City sent regular and timely email updates, conducted periodic neighborhood walks, and met with residents to gather feedback throughout construction work.
CDS hosted an open house meeting during Phase 1 that allowed community members to voice concerns. The virtual open house website was expanded into a resource hub that answered questions and provided project update details.
A Phase 2 virtual meeting was held in March 2024 and served as an opportunity for residents to meet the project team, hear about next steps, and give their feedback on Phase 1. Additionally, CDS continued responding to residents’ emails and periodically met with residents to hear their concerns.
Construction Milestones
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- May 2023: Phase 1 construction began on May 30, the City temporarily closed the two outermost travel lanes in each direction between Menchaca Road and Woodhue Drive.
- October 2023: Work was completed on the south wall of the bridge, including installation of soil nails, coping (the top covering of the bridge wall), and shotcrete.
- January 2024: Phase 1A work began in January – restricted to the west approach – at Cannonleague Drive and extending to the west side of the bridge.
- May 2024: The Mechanically Stabilized Earth (MSE) retaining walls for the north and south sides of the William Cannon Drive west approach were completed.
- July 2024: Following the soil nail installation, crews added a new layer of concrete called “shotcrete” to the area of the retaining walls where the soil nails were installed.
- August 2024: Work on the north side mirrored completed work on the south side, including traffic rail, sidewalk, curb and gutter, and subgrade work.
- October 2024: Excavation for the drainage channel on the south side commenced, as well as installation of a privacy fence with privacy slats along the north side of the bridge.
- November 2024: The south side of the bridge was completed early in the month, and the north side was completed in late November.
Capital Delivery Services has completed the emergency repair work to the west approach of the West William Cannon Drive bridge, as designed, within its anticipated timeline and associated budget.
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