Located about eight miles above Elwha Dam, it also had no fish passage. Licensed by the Federal Power Commission for 50 years in 1926, Glines Canyon Project has received annual licenses since 1976. The Elwha Dam has not been licensed. Over the next decade, ownership of both dams and property surrounding the Glines Canyon Project changed. Most of the lands inundated by Lake Mills became part of Olympic National Park in 1940, but Crown Zellerbach owned the facilities and associated land.
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Since 1911, Elwha and Glines Canyon dams have blocked anadromous fish passage to more than 70 miles of the Elwha River and its tributaries, most within Olympic National Park. This has limited anadromous salmon and trout production to the 4.9 miles of the river below Elwha Dam, which in turn reduces nutrients for aquatic and riparian habitats. All ten native Elwha River anadromous fish runs have been severely diminished and the ecosystem disrupted. At least one Elwha River salmon stock, the sockeye, may now be extinct while two stocks, the pink and spring chinook, may only be present in small numbers. The dam projects have inundated about 5.3 miles of river and 684 acres of lowland habitat beneath Lake Mills and Lake Aldwell.