What happened to Washington's wildlife after the largest dam removal in US history

The man made flood that miraculously saved our heroes at the end of O Brother Where Art Thou were an actual occurrence in the 19th and 20th century — and a fairly common one at that — as river valleys across the American West were dammed up and drowned out at the altar of economic progress and electrification. Such was the case with Washington State's Elwha river in the 1910s. Its dam provided the economic impetus to develop the Olympic Peninsula but also blocked off nearly 40 miles of river from the open ocean, preventing native salmon species from making their annual spawning trek. However, after decades of legal wrangling by the Lower Elwha Klallam Tribe, the biggest dams on the river today are the kind made by beavers.

In this week's Hitting the Books selection, Eat, Poop, Die: How Animals Make Our World, University of Vermont conservation biologist Joe Roman recounts how quickly nature can recover when a 108-foot tall migration barrier is removed from the local ecosystem. This excerpt discusses the naturalists and biologists who strive to understand how nutrients flow through the Pacific Northwest's food web, and the myriad ways it's impacted by migratory salmon. The book as a whole takes a fascinating look at how the most basic of biological functions (yup, poopin!) of even just a few species can potentially impact life in every corner of the planet.

When construction began in 1910, the Elwha Dam was designed to attract economic development to the Olympic Peninsula in Washington, supplying the growing community of Port Angeles with electric power. It was one of the first high-head dams in the region, with water moving more than a hundred yards from the reservoir to the river below. Before the dam was built, the river hosted ten anadromous fish runs. All five species of Pacific salmon — pink, chum, sockeye, Chinook, and coho — were found in the river, along with bull trout and steelhead. In a good year, hundreds of thousands of salmon ascended the Elwha to spawn. But the contractors never finished the promised fish ladders. As a result, the Elwha cut off most of the watershed from the ocean and 90 percent of migratory salmon habitat.

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By the 1980s, there was growing concern about the effect of the Elwha on native salmon. Populations had declined by 95 per cent, devastating local wildlife and Indigenous communities. River salmon are essential to the culture and economy of the Lower Elwha Klallam Tribe. In 1986, the tribe filed a motion through the Federal Energy Regulatory Commission to stop the relicensing of the Elwha Dam and the Glines Canyon Dam, an upstream impoundment that was even taller than the Elwha. By blocking salmon migration, the dams violated the 1855 Treaty of Point No Point, in which the Klallam ceded a vast amount of the Olympic Peninsula on the stipulation that they and all their descendants would have “the right of taking fish at usual and accustomed grounds.” The tribe partnered with environmental groups, including the Sierra Club and the Seattle Audubon Society, to pressure local and federal officials to remove the dams. In 1992, Congress passed the Elwha River Ecosystem and Fisheries Restoration Act, which authorized the dismantling of the Elwha and Glines Canyon Dams.

https://www.msn.com/en-us/news/technology/what-happened-to-washington-s-wildlife-after-the-largest-dam-removal-in-us-history/ar-AA1jNBqi