Longhorn Dam Multimodal Improvements Project Update
September 2024
The City of Austin's Capital Delivery Services, sponsored by the Transportation and Public Works Department, continue on with construction of the Longhorn Dam Multimodal Improvements Project! This project will be providing a new wishbone-shaped bicycle and pedestrian bridge that will connect the Ann & Roy Butler Hike and Bike Trail, as well as a new underpass for pedestrians and bikers underneath South Pleasant Valley Road.
Completed Tasks:
- Sealing of the former tunnel under South Pleasant Valley Road. The tunnel was backfilled with controlled low-strength material (CLSM) concrete and sealed with concrete cap.
- Removal of pedestrian bridge across Holly Shores Peninsula.
- Construction and excavation of the east side of the new underpass under South Pleasant Valley Road.
- Construction of abutments along Canterbury Park, Longhorn Shores and the unnamed peninsula. Abutments are the support structures that the wishbone-shaped bridge will rest on.
Removal of former pedestrian bridge across the Holly Shores peninsula.
Former tunnel backfilled under South Pleasant Valley Road.
Excavation of east side of new underpass under South Pleasant Valley Road.
Ongoing Tasks:
- Continued construction of drill shafts along Canterbury Park, Longhorn Shores and the unnamed peninsula. Drill shafts are deep foundation solutions that will support the components of the wishbone-shaped bridge.
- Construction of the footing for the east side of the underpass under South Pleasant Valley Road. Pre-cast arches for the underpass will arrive in October. The arches for the underpass are 16-feet tall and 30-feet wide at their base.
- Installation of cast-in-place concrete columns into drill shaft rebar. These cast-in-place concrete columns are verticle support columns that help hold up the bridge.
Map of current traffic configuration around the Longhorn Dam Multimodal Improvements Project.
Construction Impacts
- Traffic along South Pleasant Valley Road will continue in its current configuration.
- Vehicular traffic along South Pleasant Valley Road has been scaled down to one way traffic both ways on the west side of South Pleasant Valley Road.
- Pedestrians and bikers using the Ann & Roy Butler Hike and Bike Trail will continue to be re-routed onto the east side of South Pleasant Valley Road.
- Canterbury Street will continue to serve as a detour for pedestrians and bikers using the Ann & Roy Butler Hike and Bike Trail with one way traffic heading west.
Reminders:
- The construction site is for authorized personnel only.
- City of Austin permitted construction hours are:
- Monday - Friday, 7:30 a.m. - 5:30 p.m.
- Saturday, 7 a.m. - 7 p.m., Note: work will be taking place every
Saturday this month.
- Note: Monday - Friday: Construction workers and trucks arrive around 7 a.m.
to begin working at 7:30 a.m.
For more information, please contact:
Robert Allen, Public Information Specialist
Robert.Allen@AustinTexas.gov
(512) 978-1698
Laurie Thering, Project Manager
Laurie.Thering@AustinTexas.gov
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