PROJECT STATS

• COMPLETION DATE

  2021

• Location

  Harden & Tyler Counties

• SERVICES

  Hydrology and Hydraulics

  Transportation

• 22

  Bridge Crossings

• 14

  Mile Stretch

• 52

  Bore Holes

PROJECT OVERVIEW

A 14-mile segment of US 69 that runs through the Big Thicket National Preserve is being widened to enhance mobility and create a sense of place that promotes ecotourism and attracts visitors to the national preserve. 22 main lane and trail crossing pier-supported bridges were proposed for this project that required calculations for maximum sour depth that could occur during a storm event.

SERVICE DETAILS

Our team calculated the scour depths for the proposed bridges using HEC RAS and Hydraulic Toolbox. Fifty-two boreholes were also dug to yield soil material and particle size data. Scour calculations for main lane bridges were analyzed up to the 200-year storm while trail crossing bridges scour calculations were analyzed up to the 50-year storm.

Once complete, the US 69 corridor project will include 12-foot travel lanes in two directions divided by a forested median. The restoration project will also include a signature arch span bridge, signature signage, and a 12-mile hike and bike trail along an old railroad corridor nestled in the national preserve.