When the Northwest built out its roads in the 1940s and ’50s, streams were an inconvenience to get a road across. So crews ran the water through a pipe — a culvert — and moved on. Fast, cheap, done. Nobody in the design meeting was asked the one question that mattered to a salmon: can a fish still get up this stream?
Often the answer was no. A culvert set too high leaves its outlet perched — the water drops out the downstream end into a plunge, sometimes several feet down, into a pipe that runs too fast and too shallow for a fish to climb. The road passed. The salmon didn’t. Multiply that by decades of road-building and you wall off thousands of miles of spawning water, one cheap pipe at a time. The engineering was sound for the truck. It was a dam for the fish, and nobody called it that.
The culverts were the small blockages. There were bigger ones. On the Elwha River, on the Olympic Peninsula, two dams went up early in the twentieth century with no fish passage at all — and for roughly a hundred years, salmon that had run that river since the ice age were stopped cold at the lower dam, cut off from the entire watershed above. Same on the White Salmon, behind Condit Dam. Whole runs pressed up against concrete, doing the only thing they knew, and getting nowhere.
Here’s what made the Northwest different: the tribes had a right written down. In the treaties of the 1850s, the tribes ceded most of their land but explicitly kept “the right of taking fish… at all usual and accustomed grounds.” In 1974 a federal court (the Boldt decision) confirmed that promise meant real fish, real harvest — half of it. And you can’t take a fish that a culvert killed before it ever spawned. If the state blocks the salmon, the state breaks the treaty.
So in 2001, twenty-one treaty tribes took Washington State to federal court over the culverts. In 2007 the court found the state’s barrier culverts violated its treaty obligations. In 2013 the district court issued an injunction: fix them. The state fought it all the way up. In 2016 the Ninth Circuit affirmed. And in 2018 the U.S. Supreme Court — split 4–4, with one justice recused — let the ruling stand. The order held: Washington must fix the culverts blocking the most salmon habitat by 2030.
Strip it to the principle and it’s bigger than culverts. A court told a state that when you build the thing that moves people, you are not allowed to quietly destroy the thing that lets the fish live. The animal’s path across the land is now a factor the road has to answer for. That is a genuinely new idea in American transportation — infrastructure ordered, by law, to take the animal’s perspective.
It rhymes with what the United Kingdom did in 2022, when the Animal Welfare (Sentience) Act made animals recognized as sentient beings in law for the first time — setting up a committee whose whole job is to ask whether government policy gave “all due regard” to how it affects creatures that can feel. One country wrote the animal’s perspective into policy on purpose; one state got ordered into it by a treaty and a court. Either way, the same door opened: the creature’s experience counts now.
Then came the part that still surprises people: it worked, and it worked quickly. When the two Elwha dams came down between 2011 and 2014 — the largest dam removal in U.S. history — the fish didn’t need to be told. Within months they were pushing upstream past where the lower dam had stood. Within about two and a half years, researchers counted eight migratory species above the old dam site — Chinook, Coho, Sockeye, Pink, Chum, steelhead, Pacific lamprey, bull trout — back in a watershed that had been sealed for a hundred years. Less than a year after removal, the salmon were already carrying marine-derived nutrients back up into the forest food web. The whole river got richer because the fish could come home.
The culvert fixes tell the same story in miniature. As of mid-2024, Washington’s transportation department had corrected 146 barriers and reopened more than 571 miles of habitat — and a 2023 study using environmental DNA (fragments of salmon shed into the water) confirmed fish spawning above a replaced culvert under Interstate 5 that had blocked them before. You fix the pipe; the fish find the water. Nobody has to lead them.
Honest footnote, because the fish deserve it: getting in is fast; getting back to strength is slow. On the Elwha, as of 2023 the Chinook were still in the earliest “preservation” phase and the steelhead had moved to “recolonization” — neither run has climbed back to its historic numbers, and full recovery is measured in decades, not seasons. Removing the wall doesn’t rebuild the run overnight. It just gives the run the one thing it can’t survive without: a way through. The rest is time.
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