AECOM has announced that the Beaver Park Dam Rehabilitation Project in Colorado, US, has been named the “National Rehabilitation Project of the Year” by the Association of State Dam Safety Officials (ASDSO). 

The AECOM project was selected over three other highly qualified nominations and acknowledged the client, Colorado Parks and Wildlife (CPW), for the innovative design components of this significant dam rehabilitation.

Beaver Park Dam is a large, high hazard dam owned and operated by CPW and located near South Fork, Colorado. After an initial evaluation, the Colorado State Engineer’s Office (SEO) restricted storage in the reservoir to 20ft below the spillway crest. The AECOM team facilitated the risk analyses to estimate failure probabilities and risks for three scenarios – the existing facility under normal operation; the existing facility under restricted operation; and risk reduction alternatives. The results helped provide the SEO with a sound basis for the magnitude of the reservoir restriction.

The investigations and analyses to support selected repairs and improvements made to the dam included site investigation, left abutment stabilization, outlet works conduit replacement and control gates/valves reconfiguration (including a new downstream valve house and energy dissipation structure), spillway crest modifications (three feet higher to increase storage), and design of electrical, instrumentation and controls.

AECOM completed the final design and prepared detailed engineering drawings and technical specifications for two construction bid packages that were submitted to, and approved by, the SEO. The team also provided construction phase services which included full-time construction observation, review of submittals and RFIs, design change orders, final walk-through and punch list, construction completion report and record drawings.