Steinaker Canal Enclosure near Vernal reaches halfway point; first project in U.S. to utilize 78-inch diameter HDPE pipe. By Doug Fox

Figuring out the maximum bend radius that a Talon machine could straddle over the pipe without causing damage was key to designing requisite bends and radiuses. (photos courtesy BHI)
Rights of Passage
Working with a restricted right of way required the team to grub and excavate the existing canal, lay out the pipe, fuse the 78-inch pipe, and install and backfill it, Cottle said.
“Our approach may look different when traversing a field or large right of way,” he noted. “Both BHI and the design team (Draper-based Bowen Collins & Associates) were continuously exploring new strategies to maintain progress within the 100-foot right of way.”
Mother Nature also offered up some surprises for construction crews via prolonged winter conditions in Vernal, adding another layer of complexity to working with a clay canal. Cottle said crews placed pumps to regulate water levels, utilized blankets to manage frost, and track-out mats to keep equipment atop the mud.
Bountiful Benefits
According to a 2022 report by the Utah Department of Natural Resources’ Board of Water Resources, the estimated savings—after eliminating losses due to seepage and evaporation–will be 1,000 acre-feet of water annually for Reaches II and IIIA.
Merkley said the average annual water delivery in the Steinaker Service Canal is 27,080 acre-feet.
“Our consulting engineers estimated that enclosure of the entire canal would yield savings of 5,500 acre-feet annually, which represents approximately 20% of total deliveries,” he said.
Other than water savings, Merkley pointed to several additional benefits attached to the eventual full enclosure of the canal. They include:
- Public safety by eliminating an open canal in urbanized areas.
- Improved water quality by eliminating trash and debris inherent with an open canal.
- Reduced time monitoring the canal.
- Operational efficiencies through enhanced measurement and automation possibilities.
- Drought resiliency by providing irrigation and drinking water via Steinaker Reservoir.
- Additional benefits to fish and wildlife, the local farm economy and recreation at Steinaker Reservoir.
While the timeline for full completion is uncertain, due to funding constraints, the breakdown in the two remaining sections is known. Merkley said Reach III(b) will extend the project to Vernal’s Main Street, followed by the final four miles to the reservoir in Reach IV.
“Reach IV is significant,” Merkley said, “because it not only completes the canal enclosure but also requires pressurization of Steinaker Dam’s outlet works.”
Merkley said the just-completed sections represent a strategic investment by the UWCD toward water security in the Ashley Valley
“Although only a portion of the larger effort, the current project signifies, at the very least, a recognition by the UWCD that we shoulder a tremendous responsibility to preserve and continually develop our water resources,” he said.
For now, ownership, construction and design teams can take pride in the innovative canal design and construction through harsh weather conditions and various other challenges.
“The quality of work carried out is a testament to the team’s unwavering commitment to their craft and their dedication to delivering the best possible outcomes for all stakeholders,” Cottle said. “The primary objective of the design was to ensure the efficient and effective delivery of irrigation water to users in the Ashley Valley area, a goal that has been resoundingly achieved.”

Steinaker Canal Owner: Uintah Water Conservancy District Design Team
Civil: Bowen Collins & Associates
Structural: Bowen Collins & Associates

Construction Team
General Contractor: BHI
Concrete: Stearns Construction
Fusion: ISCO Industries
Excavating: BHI
Subcontractors: Uintah Land Survey, QC Testing, Scott Allred Paving, Earls Fence







