Archive

Minong Flowage Dam Reconstruction

Washburn County hired Ayres to complete a feasibility study at the Minong Flowage Dam. This 29-foot-high concrete gate and powerhouse structure impounds a 1,600-acre-feet reservoir and supports one of Wisconsin’s best wild rice habitats. As part of the feasibility study, dam removal options were evaluated, including cost estimates, construction dewatering, sequencing, and environmental risks. Based… Read More »

Woodley Dam Removal

The Woodley Dam in Polk County, Wisconsin, was extensively damaged by flooding. The damage and the condition of the dam prompted the County to retain Ayres for assistance in removing the structure. Ayres provided design, drawings, plans, specifications, bidding, and construction administration services. The design became quite involved due to the parties that were involved… Read More »

Byllesby Dam Spillway Modifications

Ayres provided final design and construction observation for the addition of 80% more spillway capacity to the Byllesby Dam. This high hazard Federal Energy Regulatory Commission (FERC) dam in southeastern Minnesota needed a new spillway with two 65-by-14-foot spillway gates, a new post-tensioned anchor wall, 330 feet of new foundation cutoff walls into bedrock, excavation… Read More »