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LITTLE TONSINA RIVER BRIDGE REOPENS SALMON HABITAT
In 2022, Alaska began replacing a fish-blocking culvert with a 100-foot bridge at Little Tonsina River with a $1.3 million budget. 1 year later, 70.4 miles of salmon habitat were reopened to fish safelyA flood-damaged culvert along Alaska’s Little Tonsina River long prevented salmon from swimming upstream. In July 2022, crews began replaci...- In 2024, four dams were removed from an American river. Over 400 miles of Salmon habitat reopened. Scientists are now watching an ecosystem rebuilding itselfFour hydroelectric dams on the Klamath River were removed in 2024. This project opened over 400 miles of historic salmon habitat. Indigenou...
- The U.S. Army Corps of Engineers spent $7 million on fish ladders in 1938 to move salmon past Bonneville Dam; decades later, the system carries 1 million a season in good yearsThe Bonneville Dam’s fish ladders, designed as part of a New Deal initiative, remain operational after decades of service. The construction...
- Maryland spent $12 million on a fish lift in 1991 to move American shad past Conowingo Dam; decades later, annual runs remained far below the 2 million-fish targetMaryland invested $12 million in a fish lift to help migrating shad overcome the Conowingo Dam. This technological solution proved ineffect...
- In 2015, Cullinan Ranch crews breached levees, bringing tidal flows back to 1,200 acres. 11 years later, migratory birds and fish now use the restored Napa River habitat in CaliforniaTidal marshes are valuable coastal wetlands that support wildlife, protect shorelines, filter polluted water and provide other ecosystem se...
- In 1918–1921, one dam built on California's Carmel River provided water storage but blocked fish runs; in 2015 it came down, reopening 25 miles of habitat for steelhead troutA century-old dam on California's Carmel River was removed, restoring fish spawning grounds. Crews rerouted the river and dismantled the st...
- In 2015, California EPMT discovered Japanese knotweed along Lagunitas Creek. 2 years later, treatment cut knotweed by 93% on National Park Service land, a major gain nowJapanese knotweed can spread quietly along waterways, making an early discovery especially valuable. In 2015, California’s Early Detection ...
- In 1987, Denmark launched restoration of 2,200 hectares around the Skjern River. 19 years later, SPA status arrived in 2006 as wildlife returned to the restored wetlandsDenmark restored the Skjern River wetlands after agricultural decline and pollution. The project re-meandered over twenty kilometers of riv...
- In 2018, Natasha Whetzel helped burn 20 acres at Delaware’s Hurley Tract to restore habitat. 10 weeks later, native purple love grass had spread extensively, transforming the site into habitats for birds and pollinatorsConservation work in southern Delaware is helping restore and protect important habitats within the Nanticoke River watershed. At Middlefor...
- Nepal floods: 20 years of satellite images reveal how a Himalayan river corridor became a disaster trapA 20-year comparison of satellite images shows how development transformed Nepal’s vulnerable Himalayan river corridor, with roads, bridges...
- In 2002, Shattuck Chemical agreed to pay $1.25 million for restoration of South Platte River following years of chemical release. 10 years later, the river was restored for migratory birds and native speciesHazardous substances near Shattuck Chemical Company prompted a settlement for restoration projects. Funds supported habitat improvements al...
- In 2024, researchers tested crushed waste concrete as a base for Chesapeake oyster reefs; oyster spat grew and survived with no detectable hydrocarbon leachingIn the Chesapeake Bay, recycled concrete rubble is proving to be a nursery for young oysters. Scientists have discovered that this crushed ...
- During Alaska stream research, teams developed an automated salmon-counting system to track fish in sonar video and reduce reliance on manual countingAlaska's manual salmon counting techniques are laborious and expensive. To improve efficiency, new computer vision algorithms are under dev...
- In 1992, Congress authorized the removal of 2 dams that had blocked salmon for a century. 24 years later, the Elwha River once again flowed freely from the Olympic Mountains to the seaElwha River Restoration changed one of America’s most remarkable river recovery stories. Two dams once blocked salmon from reaching upstrea...
- Four dams built on the Klamath River between 1918 and 1966 made power, not water storage; in 2024, the last came down, reopening 420 miles of salmon habitatIn a groundbreaking initiative, four dams on the Klamath River spanning California and Oregon have been dismantled after a century of exist...
- In 2012, PacifiCorp launched a trap-and-haul program to move adult salmon upstream past Merwin Dam. 14 years later, researchers found 2 stages in the system but 1 decisive bottleneck: young salmon failing to find the artificial current downstreamA trap-and-haul program on Washington’s Lewis River helps adult Chinook salmon bypass Merwin Dam by transporting them in trucks to upstream...
- Since 2022, Alaska crews have placed more than 1,000 whole trees in a creek damaged by gold mining, helping restore 2.3 miles of salmon habitatResurrection Creek in Alaska has been revitalized into a thriving river thanks to comprehensive restoration efforts. By introducing entire ...
- By the mid-2010s, California agencies had placed more than 200,000 tons of gravel below Keswick Dam, restoring egg-laying habitat for endangered salmonThe construction of dams along the Sacramento River hindered the natural flow of gravel that is essential for salmon spawning. Efforts are ...
- By the mid-2010s, California agencies had placed more than 200,000 tons of gravel below Keswick Dam, restoring egg-laying habitat for endangered salmonIn an initiative aimed at revitalizing the spawning grounds for the endangered winter-run Chinook salmon, California has been transporting ...
- In 2011, California turned dormant rice fields into winter salmon nurseries; the young fish grew up to eight times faster than in riversFlooded rice fields in California's Yolo Bypass are helping young salmon grow significantly faster. These fields provide a rich food source...
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