The Lewis River Hydroelectric Projects - PacifiCorp

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Speelyai Park—Interpretive sign #1 (Hydroelectric/Natural History) Location: Size: Title: Main Content: Speelyai Park TBD Fish and Dams The Lewis River has always been a significant river for anadromous fish. Chinook, coho, pink and chum salmon are all known to have been historically present in this system. Prior to Euroamerican settlement and commercial fish harvest, the largest fish runs in the Lewis River were chum salmon sometimes exceeding 300,000 spawners. The construction of the Merwin Dam (and later the Yale and Swift dams) presented several challenges to these fish species. All dams provide challenges to migratory fish. Many dams are too tall for fish ladders. Spinning turbines can kill young fish (smolts) as they migrate downriver. Dams slow the flow of water in the river, which can change the temperature and chemistry of the water, affecting fish. Dams also inundate former fish habitat. But with careful planning and effort, fish populations can be sustained on dammed rivers. Since the Lewis River dams were first built, PacifiCorp has worked to provide ways in which fish and dams can coexist. Main Caption: Sidebar: Sidebar Caption: Photo of stocking operation Each year, PacifiCorp-funded hatcheries stock Merwin and Swift reservoirs with thousands of rainbow trout and kokanee. One important way in which PacifiCorp supports fish runs on the Lewis is through funding hatchery programs at Merwin Dam and here at Speelyai Bay. Each year, spring Chinook, steelhead and coho salmon are trapped as adults as they arrive at Merwin dam and trucked to holding ponds at Speelyai or Merwin Hatchery. Here at Speelyai, Chinook and coho are spawned in the fall; the eggs are incubated in Speelyai Creek water and the young fish are reared first in raceways and then in net pens (watch for them in Speelyai Bay). When they reach smolt stage, the young salmon are trucked below the dam and released into the Lewis River. The Merwin fish trap is located at the base of the dam. Imprinted on the scent of Speelyai Creek and Lewis River water flowing out from the dam, the fish cluster in a large well. From there, they are transferred by hand to a large tank and immediately put in special fish-transport trucks for their trip to the hatchery. Because hatcheries are no substitute for self-sustaining runs of fish, PacifiCorp funds programs aimed at restoring natural populations of Appendix 1: panel profiles Lewis River Draft I&E Plan page 17
salmon to the Lewis. In the future, spawning fish will be brought over the dams and released into the lakes to spawn naturally in the surrounding creeks. Dam facilities will be modified to reduce turbine mortality of smolts. Images: Photos and illustrations of hatchery operations. Photos/illustrations of fish species. Appendix 1: panel profiles Lewis River Draft I&E Plan page 18
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The Lewis River Hydroelectric Projects - PacifiCorp

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