Design

IH 35E Mayhill – $130M Major Interstate Reconstruction

Denton County, Texas

LTRA lead the $130M+ major Interstate project on IH 35E at Mayhill that significantly improved the highly urbanized IH 35E corridor in North Texas. The project scope included full reconstruction of several miles of the IH 35E mainlanes and frontage roads through Mayhill, Brinker Rd and Loop 288. The project removed the existing IH 35E bridge over Mayhill that acted as a regional bottleneck by only accommodating one through lane in each direction. The replacement IH 35E bridges expanded Mayhill traffic capacity to three through lanes in each direction, creating a valuable North-South major arterial roadway for Denton County Residents. After a Buc-ees was constructed at Brinker Rd during the design process, LTRA developed multiple alternatives to address the mobility and traffic operations impacts of such a large traffic generator. LTRA eventually selected and designed frontage road bypass bridges to reduce traffic loads at the Brinker Rd frontage road signalized intersections, incorporating traffic operations solutions into the overall IH 35E Mayhill project. LTRA’s design efforts will reduce delays for the travelling public and improve safety along important regional corridors in North Texas.

Budget

Timeline

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Services provided

Project Management

Cost estimating

Highway design

Drainage design

Bridge and retaining wall design

Traffic control plan

3D modeling design

Traffic operational improvements

Surveys

Coordination with TxDOT

Photo Gallery

IH 35E Mayhill

IH35E Mayhill Exhibit Rollplot

Project highlights and key achievements

LTRA’s design efforts will reduce delays for the travelling public and improve safety along important regional corridors in North Texas.

related project

US 380 – $1B+ Major New Location Freeway

Collin County, Texas

LTRA is leading the final design for this $1 Billion+ new location freeway through one of the fastest growing counties in the US. The new location freeway section of US 380 will serve as alternative route to existing US 380 and improve congestion, increase mobility, and reduce crash rates in the area. The US 380 freeway design includes a 6-lane mainlane typical section with 2-3 lane frontage roads. The project also includes 7 new location grade separated interchanges at W University Dr, Wilmeth Rd, Bloomdale Road West, Ridge Rd, Lake Forest Dr, Taylor Burk Dr, and Bloomdale Road East. Complex HEC-RAS 2D H&H modeling was developed to support the design of the US 380 corridor across the Elm Fork Trinity River. LTRA coordinated with TxDOT and multiple stakeholders to ensure key design issues are addressed in a corridor that is rapidly developing. LTRA is assisting TxDOT to develop a staged implementation construction plan for the US 380 corridor that will fit within TxDOT’s budget. The US 380 project is one of the largest final design projects currently in the TxDOT Dallas District.

SH 105 – $100M Rural Highway Widening

Hardin County, Texas

LTRA was the lead designer for the $100M+ project to reconstruct and widen 7+ miles of SH 105 between Sour Lake and Pine Island Bayou in Hardin County for the TxDOT Beaumont District. Within the city limits of Sour Lake, a 4/6-lane urban typical section was designed that included raised medians to improve safety, median openings for dedicated left turn lanes, and sidewalks to accommodate both bicyclists and pedestrians. In the rural section of the project, LTRA developed a five-lane typical section with a continuous left turn lane to replace the existing two-lane rural highway. The combined urban and rural designs significantly improved safety along SH105 by providing separate lanes for turning vehicles and through traffic. LTRA developed the ROW mapping documents to support TxDOT’s ROW acquisition process along the corridor. LTRA also lead Utility Coordination efforts on SH 105 that included 20+ major petroleum pipeline crossings. Roadway and ditch designs were revised to eliminate almost all conflicts with petroleum pipeline crossings, significantly reducing cost and schedule impacts for TxDOT.

IH 30 – PGBT Interchange – $350M+ Major Interstate Interchange Design

LTRA led the final highway design for new location multilevel interchange between IH 30 and NTTA’s President George Bush Turnpike (PGBT). LTRA coordinated with both TxDOT and NTTA throughout design to facilitate a collaborative project development process for the interchange between TxDOT and NTTA roadway facilities. The multilevel freeway interchange included four new direct connector bridges as well as twin 1+ mile 4-lane bridges spanning Lake Ray Hubbard. Design of the lake bridges required extensive coordination with Dallas Water Utilities that owns the water rights to Lake Ray Hubbard. LTRA developed special drainage designs for the lake bridges to capture the first flush during rainfall events to restrict pollutants and suspended solids from entering Lake Ray Hubbard. The sequence of construction for the interchange was developed to open direct connectors from IH 30 to PGBT early to maximize toll revenue for NTTA while also maintaining existing traffic on a highly congested section of IH 30. The IH 30 – PGBT interchange connected the entire PGBT Eastern Extension to IH30, significantly improving mobility in the region.

IH 10 – $450M Major Interstate Reconstruction

San Antonio, Texas

The $450M+ IH 10 Major Interstate Reconstruction project represents a significant investment in mobility and safety for one of San Antonio’s most important transportation corridors. The project is expanding IH 10 from a four-lane rural highway to a six-lane freeway with continuous two-lane frontage roads, providing additional capacity to meet growing traffic demands. LTRA led the final highway design for three separate PS&E packages as the prime provider, supporting TxDOT’s goal of advancing the project on an accelerated schedule. The design incorporated solutions to reduce utility conflicts and streamline relocations. LTRA also addressed hydraulic considerations related to the corridor’s flat terrain and multiple stream crossings. To further support project delivery, the design minimized right-of-way impacts and optimized the project footprint. LTRA’s work is contributing to the efficient advancement of this key interstate improvement for the San Antonio region.

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