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UPW (Ultimate Play Wave) at Grimes Pass Dam Site
Description
The UPW forms at certain flows at the former Grimes Pass Dam site. Grimes Dam site is not an access but it is a historical site at the pull out at Highway 17 mile 17.1. This old hydropower dam failed in 1943 and there is an interpretive site along the highway. At USGS River Mile 89.9.
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