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Pool-and-weir fish ladder at Bonneville Dam on the Columbia River Drone video of a fish way in Estonia, on the river Jägala FERC Fish Ladder Safety Sign. A fish ladder, also known as a fishway, fish pass, fish steps, or fish cannon is a structure on or around artificial and natural barriers (such as dams, locks and waterfalls) to facilitate diadromous fishes' natural migration as well as ...
The Cowlitz River has three major hydroelectric dams, with several small-scale hydropower and sediment retention structures within the Cowlitz Basin. The Cowlitz Falls Project is a 70 megawatt hydroelectric dam built in the early 1990s and completed in 1994. The dam is 140 feet (43 m) high and 700 feet (210 m) wide.
Automatic fish counters are automatic devices for measuring the number of fish passing along a particular river in a particular period of time. Usually one particular species is of interest. One important species studied by fish counters are Atlantic salmon. This species is of interest owing to its ecologically vulnerable status and anadromous ...
Including just the dams listed below, there are 60 dams in the watershed, with 14 on the Columbia, 20 on the Snake, seven on the Kootenay, seven on the Pend Oreille / Clark, two on the Flathead, eight on the Yakima, and two on the Owyhee. Averaging a major dam every 72 miles (116 km), the rivers in the Columbia watershed combine to generate ...
A fish screen is designed to prevent fish from swimming or being drawn into an aqueduct, cooling water intake, intake tower, dam or other diversion on a river, lake or waterway where water is taken for human use. They are intended to supply debris-free water without harming aquatic life. Fish screens are typically installed to protect ...
By 2008, the dam gates were open in all months except for the primary irrigation season of mid-May to mid-September, but the migrating fish count remained low. In 2009, the National Marine Fisheries Service mandated that the dam gates be opened year round, allowing the river to flow freely. A new pumping plant and fish screen was constructed ...
A special fish barrier dam was built to lead salmon and steelhead, returning to spawn, into the Feather River Fish Hatchery. The California Office of Environmental Health Hazard Assessment (OEHHA) has developed a safe eating advisory for fish caught in the Thermalito Forebay and Afterbay based on levels of mercury or PCBs found in local species.
Bowmanville Creek has been dammed in several places. About one kilometre north of Lake Ontario is the former Goodyear dam, originally built to provide electricity for a factory. This dam was a barrier to fish migration, and until the construction of a fish ladder trout and salmon were lifted over the dam by volunteers and conservation workers.