Civil Engineering

Donnell & Allred, Inc. has been designing the infrastructure for the Big Horn Basin since 1932. We are still in business more than 70 years later for one reason - Service.

Some of the earliest projects completed by Bell & Donnell (our original name) were the Sunshine and Leavitt Reservoirs. We also were responsible for many of the irrigation facilities in the Big Horn River valley. We designed 29 new irrigation structures for the Upper and Lower Hanover Canals as well as structures for Bluff Canal.

Diversion Dam on Big Horn River

Miller Dam


New Middle School in Worland

Birdseye View of Middle School

When CTA Architects and Engineers was hired to design a new Middle School in Worland, they knew they could rely on Donnell & Allred for local expertise and efficient services. We worked with CTA throughout the design process, from providing an existing site survey to designing the site plan to inspecting building construction. The design team was able to design the project to meet the expectations of the School Board for well under the budgeted amount. For more details click here.

West Broadway in Thermopolis

This project was a redesign of West Broadway Street in Thermopolis for WYDOT. There were many challenges that we successfully overcame throughout the design process. The project included approximately 1 mile of street reconstruction, redesign of a major highway intersection, 750 ft of retaining wall and a new storm sewer system. For more details click here.

Before and After of Intersection


Boy's School Water & Sewer Line

Boy's School Water Tower

Donnell & Allred took over an unfinished design of a water and sewer line to the Wyoming Boy's School and completed the design in a timely and cost-effective manner. The Boy's School needed to upgrade their aging sewer and water system. We designed water and sewer transmission mains for the five mile stretch between the Boy's School and Worland's municipal systems. We also designed a 300,000 gallon elevated Hydropillar water tank. For more details click here.