Work begins July 24 at Parmer Lane and I-35 and other transportation updates for Northwest Austin

TxDOT is planning to implement a diverging diamond intersection at I-35 and Parmer Lane.

TxDOT is planning to implement a diverging diamond intersection at I-35 and Parmer Lane.

Here's a look at what transportation projects are happening in Northwest Austin area.

Featured project

I-35 at Parmer Lane

TxDOT breaks ground July 24 on the project to construct a diverging diamond interchange, in which vehicles cross over to the opposite side of the road to facilitate more efficient turning movements. TxDOT has awarded the contract for the project, and construction is expected to begin sometime this summer. The project also includes adding turn lanes at the intersection of Parmer and North Lamar Boulevard.

Timeline: July 2019-mid-2021
Cost: $32.5 million
Funding source: TxDOT

Ongoing projects

The city of Austin is still in the design phase for expanding Spicewood Springs Road between Loop 360 and west of Mesa Drive. Plans could include expanding the road to four lanes with a median and turn lanes. The $17 million project is being funded through the 2016 Mobility Bond.

Timeline: 2022 (construction begins)

Design work is still underway to make $7.26 million worth of improvements to Anderson Mill Road between Spicewood Parkway and US 183. City staffers expect to have an update later this summer. Improvements could include adding turn lanes, sidewalks and medians.

Timeline: 2020-21 (construction)

Travis County is planning to host a second community meeting in August for residents to preview the preliminary design the county selects for a new bridge at the Spicewood Springs Road low-water crossing No. 1. Design is about 20% complete on the project, which could cost between $3.2 million and $4.1 million.

Timeline: summer 2020 (construction begins)

Latest updates

MoPac construction

Work on the MoPac express lane project, including the sound walls, finished in July. The project added one managed-toll lane, which is variably priced, between Parmer Lane and Cesar Chavez Street.

Timeline: October 2013-July 2019
Cost: $230 million
Funding sources: various local sources

I-35 projects

Crews finished six columns for the bridge beams on the northwest corner of I-35 and US 183. Demolition wrapped in June on the St. Johns Avenue bridge. TxDOT officials expect the new bridge to open in late summer. Drivers on St. Johns must turn right onto the I-35 frontage roads and use the U-turns at US 183 or Hwy. 290 East to access St. Johns on the other side of I-35 during reconstruction of the bridge.

Timeline: January 2018-mid-2021
Cost: $124 million
Funding source: TxDOT

I-35 and Braker Lane upgrades

The city of Austin finished a safety project that included a raised median on Braker west of I-35 to manage turn movements, an extended turn lane for vehicles turning left onto the northbound I-35 frontage road, and new sidewalks and crosswalks.

Timeline: January-June 2019
Cost: $1.23 million
Funding source: 2016 Mobility Bond


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