Client Texas Department of Transportation - Waco

Waco North Loop 363 - N. Troy

Bell County, TX

LAN served as Lead Design Engineer for 6.4 miles of improvements to this critical corridor serving North/Central Texas. The project consisted of reconstructing a four-lane freeway to a six-lane freeway and included five grade-separated intersections with turnarounds. The existing two-way frontage roads were converted to one-way frontage roads to increase safety and operations.

The complex integrated design included roadway, drainage, structural, SW3P, traffic control plans, signing and striping, illumination, signal design, ITS, and railroad coordination.

LAN optimized roadway vertical alignments to streamline the design and construction of the multiple at-grade intersections. Special considerations for traffic control planning were implemented for the construction of these structures, as the existing traffic was maintained along a constricted ROW corridor.

The northern half of the project included the design of 12 culvert crossings (seven in FEMA floodplains), 28,000 LF of urban storm sewer drainage, and three miles of open ditch design. LAN applied both TxDOT roadway and hydraulic design criteria along with FEMA regulations for the roadway and hydraulic analysis. A drainage report was provided to the local Floodplain Administrator for review to show no adverse impact to the seven FEMA crossings.

At a glance

6.4 mile project

12 culvert crossings

28,000 LF storm sewer drainage

Part of a larger IH 35 expansion of 14 segments total

$123.6 million construction bid

Ten distinct disciplines involved in planning


Improved safety with one-way frontage roads

Increased capacity with freeway lane expansion

Intelligent traffic systems



Planning & Modeling

Transportation Services

IH 35

is also known as the "Main Street" of Texas

IH 35 spans 407 miles in Texas, 1/3 of the road's overall length