We were contracted to replace flashboards and perform apron scour repairs at a hydroelectric dam along the Rock River in the Upper Midwest. Our client is a privately owned entity that owns and operates 80+ hydroelectric facilities throughout the United States.

The project’s significant goals involved increasing the dam’s retainage capacity, protecting the existing spillway structure, and providing an aesthetically pleasing spillway for the community's residents. This project was scheduled for the summer months when flow rates are at their lowest, mainly due to the volatility of the Rock River and the need for a slow-moving current to keep our divers safe. 

We're at Minnesota Power's hydroelectric dam in Scanlon, Minnesota, to replace 7 of the structure's Tainter gates. Extending the life of this renewable energy source by 50 to 100 years, the Scanlon Dam Gate Replacement Project enables the further creation of clean, renewable power provided to local communities. 

We were pulled into the project very early on during the design phase of the project. Both Nelosca and Minnesota Power attribute the project's success to early contractor involvement.

Nelosca Technologies, Inc. (Nelosca) announces the promotion of Christopher Rousseau, P.E., F. ASCE to Hydro and Renewable Energy Market Leader. Rousseau’s promotion is announced concurrently with Nelosca’s strategic objective to further invest in renewable energy development.

Rousseau will use decades of experience in hydroelectric generation working for Midwest-based utility, Minnesota Power, to support the repair and rehabilitation needs of Nelosca’s hydro dam clients. Catering to a huge need for early contractor involvement; Rousseau is bridging the gap between hydroelectric dam owners, engineers, and the contractor teams that perform inspections, maintenance, and rehabilitation work.

Our Pacific Northwest crew mobilized at a hydroelectric facility to repair a fish guidance net at Upper Baker Dam. Upper Baker Dam is 1 of 2 hydroelectric dams on Baker River, near Concrete, WA. The entire Baker River Hydroelectric Project covers nearly 300 square miles.

Upper Baker Dam, a 312-foot-high concrete gravity dam completed in 1959, has a floating surface collector system responsible for attracting and safely holding juvenile salmon for downstream transport around the dam. We supplied dive and topside support teams to assist the prime contractor with the recovery, disassembly, and installation of a new floatation collar on the existing barrier net. This is an essential repair to ensure safe fish passage around the dam.

102 years of lateral earth pressure and deterioration at Pisgah Dam caused its existing spillway wall to lean. Partnering with private dam owner Otter Tail Power Company, Nelosca ensured their hydropower dam received necessary repairs. The project included concrete demolition and the replacement of the dam's north spillway wall over two years.

The Federal Energy Regulatory Commission (FERC) regulates the transmission and wholesale sale of electricity in the United States. An important duty of FERC is to monitor conditions of the more than 1,700 non-federal, electricity-generating dams in the US. They also set standards that hydropower project owners must follow to ensure the safety of the general public. This includes mandating regular inspections of hydropower projects to certify they are in sound condition and comply with the Commission’s safety standards. Owners not in compliance with the Commission’s inspection standards risk losing their power generating license.

Lock and dam and hydropower infrastructure face numerous unique challenges when it comes to improving the safety and reliability of existing dams. An important structural enhancement for dam stabilization projects is the installation of high-capacity post-tensioned anchors, which may supplement or replace existing anchors.

According to the Post-Tensioning Institute, post-tensioned rock and soil anchors provide a cost-efficient, high-performance solution for projects needing both temporary and permanent stabilization solutions.