Update on the MoPac Intersections – Slaughter Lane & La Crosse Ave

Update on the La Crosse Ave Intersection

Crews are about to begin construction on the bridge at La Crosse Avenue over the MoPac mainlanes.  It is necessary to close La Crosse Avenue at MoPac while preparation activities are underway and during construction to increase safety and mobility for travelers.  While La Crosse Avenue is closed, a detour will be in place at South Bay.

Crews will completely close South Bay Lane at 6 p.m. Thursday, March 28 to set up the detour.  The roadway will reopen to motorists at 6 a.m. Friday morning, weather permitting.  La Crosse Avenue will close to motorists beginning at 9 p.m. Friday, March 29 for the duration of work.  Signs will be posted to direct motorists, and police officers will be on-site for at least one week to help direct traffic.  We anticipate the closure to last through the summer, weather permitting.

To help with traffic flow, all traffic signals at La Crosse will be removed beginning at 9 p.m. Monday, April 1.  Temporary signals will be added to the eastbound La Crosse Avenue and southbound MoPac intersection to allow for a protected right turn from eastbound La Crosse Avenue.

During the closure, motorists will be able to turn onto MoPac form La Crosse Avenue and onto La Crosse Avenue from MoPac, however, motorists will not be able to travel across the MoPac mainlanes.

Detour Information

Temporary adjustments at South Bay Lane have been made to increase mobility for travelers attempting to access northbound/southbound MoPac and La Crosse Avenue east/west of MoPac.  See below for more information to navigate the detour.

South Bay Lane Adjustments

  • Temporarily transformed from a traditional intersection to a free-flowing turnaround to access northbound and southbound MoPac
  • Will be returned to its original configuration once the bridge is open.

Dear Wildflower Park Neighbor,

The City of Austin will begin the process of relocating water lines to make space for a Texas Department of Transportation project at South Loop 1: Slaughter Lane to La Crosse Avenue.

Water service will be redirected to a newly constructed line, and water will need to be temporarily shut off during the transfer. This interruption will only impact residents at the Wildflower Park Neighborhood.

The project team has tentatively scheduled water service to be shut off on April 4 beginning at 10 p.m. The work is anticipated to take up to 8 hours. Service will be restored by 6 a.m. on April 5.


We understand this inconvenience and are committed to restoring water service as quickly and safely as possible. We appreciate your cooperation during this process.

For any service-related questions, please contact Austin Water Dispatch at 512-972-1000. This line is answered 24-hours a day.

Project Contacts:

Rick Glosson, Project Inspector, 512-925-0266
Emlea Chanslor, Austin Water Outreach, 512-972-0145, emlea.chanslor@austintexas.gov


Construction is moving south toward La Crosse Avenue. Sound walls are being built on the east and west side of MoPac between Slaughter Creek and La Crosse Avenue. Retaining walls are being erected in various locations, and excavation activities continue to prepare for bridge construction, which is anticipated to begin this spring. The project remains on time for a completion date of early 2021.

Throughout the construction process crews have discovered some interesting features in the area, which are common in the Edwards Aquifer Recharge Zone. Examples of these karst features include underground caves, sink holes, fractures and voids. The end result can be intriguing and we wanted to share some photos with you.

While these voids can be fascinating and tempting to explore, we ask that the public steer clear for their own safety. Our geoscientists are currently mapping the features and determining the next course of action. TxDOT is also working with the Texas Commission on Environmental Quality, the City of Austin and the Barton Springs Edwards Aquifer Conservation District to evaluate and put mitigation plans together, so that we can continue building the MoPac mainlanes under La Crosse Avenue, while protecting the aquifer.

Regular updates are shared via email and Twitter. To sign up, please send an email to MoPacIntersections@txdot.gov with “updates” in the subject line, or follow us on Twitter @TxDOTAustin, search #MoPacIntersections.


MoPac Intersections Project Team
(512) 693-7425

Below is a diagram showing the configuration and how to drive through it.


General Construction Information

Please note that schedules are subject to change due to weather or field conditions. General work hours take place Sunday through Friday. Work will occur both during the day and at night during the times shown below, unless otherwise noted.

Daytime Work Hours: 7 a.m. to 6 p.m.
Nighttime Work Hours: 7 p.m. to 6 a.m.


Alternating north and southbound lane closures continue nightly from South Bay Lane to Davis Lane.

Sunday – Thursday, 8 p.m. – 6 a.m.
Friday – Saturday, 10 p.m. – 8 a.m.


Alternating east and westbound lane closures continue nightly at the MoPac intersection.

Sunday – Thursday, 9 p.m. – 5:30 a.m.
Friday – Saturday, 10:30 p.m. – 8 a.m.