Published on January 24th, 2018 | by UC&D Magazine
Most Outstanding Water/Wastewater Project
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Tibble Fork Dam Rehabilitation
Over the course of its 60-year history, this popular reservoir up American Fork Canyon had filled in with sediment, requiring it to be raised 15 feet and expanded from 10 to 25 acres in size. Harsh winter weather conditions taxed workers on this $8.6 million infrastructure project. It ultimately required crews to work around the clock, seven days a week to meet the May deadline.
One unique aspect was the construction of a three-foot-thick cement-bentonite slurry wall more than 70 feet below the reservoir bottom, which required use of a long-stick excavator with an 80-foot reach. The wall mitigates seepage below the dam wall, which was also raised 15 feet. A new concrete spillway structure was built so that water inflow could be diverted during construction.
Owner: Northern Utah County Water Conservancy District
Lead Design Firm: RB&G Engineering
General Contractor: Whitaker Construction
Structural & Civil Engineer: RB&G Engineering
Other Specialty Contractors: Geo-Solutions; Spindler Construction