Project Info:

Location: Fannin County, Texas

Role: Prime

Owner: Texas Department of Transportation

Client: Texas Department of Transportation

Construction Cost: $6,847,235

Services:

  • Interchange Design
  • Controlled-Access Highway (Non-Interstate) Design
  • Highway/Roadway Design
  • Prestressed Concrete Girder Bridge Design
  • Pavement Evaluation/Design
  • Hydrogeological Investigation/Analysis
  • Culvert Design
  • Retaining Wall Design
  • Signing Design
  • Lighting Design
  • Utility Coordination
  • Alternatives Development and Analysis
  • Right of Way Evaluation
  • Construction Phasing Plan Development
  • Right of Way Surveying/Mapping
  • Final Plans, Specifications, and Estimates (PS&E)

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To improve safety and traffic operations, the Texas Department of Transportation (TxDOT) replaced the existing at‐grade intersection of FM 898 and US 82 with a grade‐separated interchange. Lochner performed an alternatives analysis of the interchange configuration during the project’s preliminary engineering phase and provided final design of the preferred interchange configuration.

For the alternatives analysis, Lochner conducted an interchange configuration study that examined two diamond interchange alternatives with options for US 82 to travel either under or over the interchange as well as a modified jughandle interchange that would reduce right of way impacts particularly to a cemetery located southwest of the project. Lochner assessed the alternatives in terms of safety, operations, cost, and constructability and recommended the construction of the jughandle.

For the new interchange central structure, Lochner designed a 420‐foot‐long, 60‐foot‐wide prestressed concrete girder bridge, which carries FM 898 over US 82. The project pavement design incorporated a geogrid for increased strength. Additionally, an existing US 82 bridge was widened to accommodate an acceleration lane, all interchange lighting was upgraded, and existing drainage systems were rerouted to improve operations. Lochner performed the first portion of design while the immediately adjacent section of US 82, to which the new interchange ramps would connect, was under construction. This required considerable coordination with the TxDOT area office and flexibility to adapt the ramp design as field issues were encountered that altered the proposed construction. Lochner also resurveyed the area after construction to ensure the design would fit seamlessly with the new US 82 features.

In addition to eliminating all impacts to the adjacent cemetery, Lochner’s plans used phased construction to minimize disruption to traffic during construction and ease the transition to a grade‐separated facility.