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FISH PASSAGE
China used a 480m fish bypass channel to solve migratory habitat blockage on a 134km canal; the result transformed fragmented waterways into thriving aquatic corridorsChina’s 480-meter fish bypass is turning an engineering barrier into a route for wildlife. Built alongside a 134-kilometer canal, the passa...- In 2014, Massachusetts' JRWA began work to remove a dam sitting 10 feet below the Elm Street Bridge. 5 years later, the Jones River was freed for alewife, eels and trout once againElm Street project was also part of a broader sequence of restoration work on the Jones River. A previous obstacle, the Wapping Road Dam, h...
- China built 134-km long Pinglu canal after spending four years digging through mountains; it now cuts 560 kms to reach the seaChina has opened the Pinglu canal, a 134.2 km waterway built over four years at a cost of USD 10.75 billion, linking Nanning in Guangxi to ...
- In 2006, Hawai‘i listed Waipā Stream, after dense hau bush trapped sediment and blocked fish. Today, restoration cut average turbidity by 62% and restored native fish passageWaipā Stream restoration efforts significantly improved water quality and aquatic habitats. Invasive hau bush removal and feral pig control...
- In 2011, New South Wales sank ex-HMAS Adelaide off the Central Coast; five years of surveys identified 62 fish species from 31 families around the wreck before storm damage led to its closure in July 2024In mid-2024, severe storms wreaked havoc on the ex-HMAS Adelaide artificial reef, leading to significant structural concerns. The superstru...
- In 2023, Connecticut removed Strong Pond Dam after 20 years of planning. 3 years later, 10 upstream miles are open to fish, reconnecting 20 miles of habitat for wildlifeThe removal of Strong Pond Dam in Wilton, Connecticut, marks a significant achievement in river restoration. This initiative has revitalize...
- In 1996, Idaho listed Fish Creek for sediment after erosion damaged aquatic habitat. 22 years later, restoration helped it earn the maximum 3.0 score for cold-water lifeFish Creek in Idaho was listed as impaired for sedimentation in 1996. Collaborative efforts by various stakeholders improved road surfaces ...
- In 2020, American Rivers removed the Middle Fork Nooksack dam after 50 years of blocking fish in Washington. 2 years later, the river reopened 16 miles of habitat for Chinook salmon and troutMiddle Fork Nooksack salmon habitat: A dam built in 1961 was removed in 2020, restoring river access. This action reopened sixteen miles of...
- In 2021, Washington's Skagit River System Cooperative installed an 80-foot bridge over the Lucas channel. 5 years later, the project has helped reconnect fish habitat across the floodplainA restoration project in Washington’s Barnaby Reach has focused on improving floodplain connectivity and fish passage by removing infrastru...
- 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...
- Lake 223 acid rain experiment: Scientists added sulfuric acid to an Ontario lake for 17 years. The water recovered, but the fish didn’tA 17-year acid rain experiment at Canada’s Lake 223 changed its water chemistry and disrupted its ecosystem. Although the lake’s acidity ha...
- In 1892, engineers began the Chicago Canal to divert sewage using 42 million cubic yards of earth; more than a century later, it may help Asian carp reach the Great LakesIn 1885, Chicago undertook the monumental task of reversing its river flow to safeguard drinking water by rerouting sewage from Lake Michig...
- 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 2012, Cleveland Metroparks surveyed Beecher’s Brook after Ohio listed the Chagrin River as impaired, then restored 350 feet. 8 years later, fish scores improved againBeecher's Brook restoration project removed a fish passage barrier and enhanced habitat. This work led to marked improvements in fish and m...
- 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 2021, New York assessed Cannonsville Reservoir as impaired after a 7-foot culvert blocked fish passage. 2 years later, the new culvert scored 0.88 for aquatic passageA culvert replacement project in Delaware County, New York, addressed stream-flow, erosion, sediment, and fish-passage problems along an un...
- In 2016, NYSDEC and partners removed Shapp Pond Dam after 50 years of blocking migratory fish. 4 years later, restored habitat showed significant gains in stream health and wildlifeThe removal of the Shapp Pond Dam in Dutchess County, New York, helped restore aquatic connectivity and improve stream habitat along the Ea...
- In 2018, New York's Cortland County funded 3 culvert and stream projects. 5 years later, all 3 sites improved from severe barriers to insignificant barriers for better fish passageCortland County projects fit into a broader New York effort to identify and address barriers to aquatic organism passage. New York's Depart...
- In 2014, Maine began developing a fish elevator to carry American shad past Milford Dam. 12 years later, the system could reopen 600 miles of river habitat to a fish whose migration has been blocked for decadesA Maine fish elevator could reopen 600 miles of river habitat for alewives, giving a small fish a much bigger chance to return upstream. Th...
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