Salmon and other migratory fish attempting to return to their spawning grounds in the Pacific Northwest face no fewer than 400 man-made barriers in the Columbia River Basin, the earliest dating back to 1885—and there may be as many as 100 more constructed illegally on private property, tribal fish biologists estimate.

The impediments to fish migration posed by such monolithic barriers as the 551-foot-high Grand Coulee Dam are well documented, but anadromous fish face a myriad of other obstacles as well. In the 129 years since that first dam was built in Spokane, Washington, fish passage has been restricted, if not totally eliminated, in many areas, tribal experts said at a recent workshop addressing the issues. And it’s not just the Columbia River.

“The tributaries and main stem Snake River habitat are probably in worse shape than on the Columbia,” said Dave Johnson, program manager for the Nez Perce Department of Fisheries. “The main stem is a mess. All the Snake River salmon ....


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