Dams / Fisheries / Hydro

This project was an existing site of an out dated fish collection facility used to trap and haul Endangered Species Act listed fish around Detroit and Big Cliff dams on the right bank of the North Santiam River near Gates, OR. This high-profile project between State Hwy 22 and the North Santiam River required close…

This $28.3 MM project included construction of an intake structure and pumping plant with large vertical turbine pumps and piping to supply five different irrigation canals. The sequence of work on this project required three in-water-work periods over a three year duration. Major components of work include the installation of multiple contractor-designed and installed cofferdams…

The Gold Ray Dam Removal and River Restoration is a design-build project that included the removal of two dams, a powerhouse, and associated fish ladders. Removal of the Gold Ray Dams represents one of the largest dam removals ever undertaken in the United States. The concrete dam is 38 feet tall by 360 feet long…

The work on this project consisted of the fabrication-installation of a bulkhead/stoplogs system, dewatering of the spill bay, concrete demolition, concrete anchor installation, placement of new 35 foot tall spillway flow deflector with high velocity concrete finish (2,400 CY), heavy hoisting and a diving operation to facilitate increased fish passage through the existing hydroelectric facilities.…

This $11.5 MM facility was a fast track project with the majority of the structural work taking place during the winter months in Klamath Falls, Oregon. Work included the design and construction of a cofferdam that isolated the work area from Klamath Lake, design and construction of temporary dewatering system connected to permanent power with…

The installation of a new fish ladder at the Link River Dam was required to allow for passage of endangered short-nosed and Lost River sucker fish and Redband Trout from the Klamath River system to Upper Klamath Lake. The work consisted of the construction of a fish ladder addition to the existing Link River Dam.…

This work is for improvements to the entrance (downstream end) of the north shore fish ladder. The improvements are to address existing fish passage delays. Work elements include water management, dive work, partial demolition and rebuilding of the fish ladder entrance for a variable width weir, and new stoplogs and stoplog guide slots, steel fabrication,…

This dam removal project on the Rogue River near Gold Hill, Oregon, utilized large five cy bulk bags that were designed by Slayden to facilitate utilizing native river alluvium materials as a cofferdam. Silt curtains were used on the downstream side of the existing dam to facilitate containment of turbidity and to serve as an…