About SPU
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Water System
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Habitat Conservation Plan--HCP
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Landsburg Mitigation
Operations and Site Description
The fish passage facilities were designed to separate sockeye from other species and to load them into a specially designed truck so they can be released elsewhere. Species other than sockeye are passed through the facilities and released so they can spawn above the dam.
The fish ladder and sorting facility are composed of four main components:
(1) lower ladder, (2) sorting and holding, (3) fish transport, and (4) upper ladder. The lower ladder includes three downward opening fish entrance gates, a series of 11 vertical slot steps in a channel that raises the water elevation in one-foot increments, and an adult guide panel gate. The sorting and holding facility contain two holding ponds with mechanical crowders, a pescalator (fish lift), a sorting table, and a volitional bypass channel with a fish trap. One holding pond is divided in half with a size sorting panel to allow smaller fish into the upper half of the pond and keep larger fish in the lower half. The second holding pond contains a mechanical crowder and a wall that divides the pond lengthwise. The fish transport component contains a foot crowder, fish hopper, a 5-ton hoist, and parking area for the fish transport truck. The upper ladder contains 3 vertical slot steps, a fish counter, and the fish ladder exit.
Sorting Mode
The fish ladder and sorting facility were designed to operate in either sorting mode or passive mode. Sorting mode is used when sockeye are present at the ladder, typically from early September through December. In this mode, sockeye are sorted from Chinook or coho using a mechanical crowder in holding pond one.
Passive Mode
When the fish ladder is operated in passive mode all fish are allowed to bypass the sorting facility and move unhindered through the upper ladder and into river above the dam. Typically the fish ladder is in passive mode from January through August.
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