Construction is progressing on a $115.9 million project to replace the spillway at Hyrum Dam in Utah, US, with significant changes already visible around the site. The work is intended to improve dam safety, enhance flood management, and ensure continued water delivery for irrigation in the region.
Built in the 1930s, Hyrum Dam plays a key role in storing and distributing water from a 212-square-mile drainage area. The existing spillway no longer meets current engineering standards, prompting its full replacement.
The new spillway is designed to safely manage high water flows and withstand earthquakes. A recently expanded outlet bypass is being used to control runoff during construction.
“This project will help ensure the long-term safety and reliability of Hyrum Dam,” said Rick Baxter, Provo Area Office Manager for the Bureau of Reclamation. “It’s a big step forward in securing the water supply for this region’s future.”
Construction began in May 2025 and is expected to last four years. The road across the dam (W 300 South) is closed for the duration of the project. Detours are in place, and Hyrum State Park remains open.
The project is jointly funded by the South Cache Water Users Association and the federal government. Planned work includes:
- 330,000 cubic yards of excavation
- 15,500 cubic yards of concrete
- 5.4 million pounds of reinforcing steel
The South Cache Water Users Association operates and maintains the dam. The construction contract follows years of planning by the Bureau of Reclamation and project partners.
Back in April it was announced that USBR awarded a $115.9 million construction contract to AMES Federal Contracting Group of Burnsville, Minnesota, for the replacement of the spillway.
