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Columbia Basin Passage Barriers

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Not all of the Columbia River Basin is accessible to salmon. Some areas are blocked naturally behind major waterfalls that formed a passage barrier. Other area have been blocked by human interference, primarily dams without fish passage. This map shows both types of blocked areas in the basin.

Click here to download a 11x17 high-resolution PDF version of this map suitable for printing.

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Shoshone Falls

Historically, salmon migrating up the Snake River were blocked by Shoshone Falls, near present-day Twin Falls, Idaho. Today, salmon are blocked 370 miles downstream from Shoshone Falls by the Hells Canyon Dam, which has no fish passage facility.

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