Working to
Restore Rivers
Since 1984

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Featured Projects


Dam Removal & Fish Passage

Fish passage barriers across the United States are being removed or modified to help fish and wildlife, improve safety and boost recreation. We’ve worked on 130+ dam removals, removed hundreds of culverts, and developed best practices resources for bridge crossings.


Estuary Restoration

Estuaries are dynamic ecosystems where oceans, rivers and human economies converge; they’re also critical to rearing grounds for fish and wildlife and at particular risk to a changing climate. Across the country, we’re reconnecting and restoring these habitats.



Beginning with the daylighting of Tanner Creek in Portland (1992), we’ve been collaborating with urban planners and landscape architects to restore urban streams from coast to coast in the US and abroad.

Thanks to Sonoma Water for sharing this video highlighting more than a decade of working with private landowners and resource agencies in the Dry Creek valley to restore habitat for endangered Coho and Steelhead. To date three miles of Dry Creek have been restored by Sonoma Water with another 3 miles to be constructed in close collaboration with The Army Corps of Engineers.

Inter-Fluve has completed over 2,400 projects. Here’s where we’ve been working.

Described by John J. Audubon as "a vigorous and robust bird," the common merganser is a large duck found near water throughout the Northern Hemisphere. The word "merganser" is a combination of the Latin words "mergus" (a generic term for waterfowl) and "anser" (meaning "goose"). In the UK, they are commonly known as "goosanders," and they were known to French speakers in Louisiana as "becs-scie-de-mer" (or "sea sawbills"). #audubon #oregon #merganser #duck #goosander ...

Lampreys and people have an interesting history. They were kept as pets by Ancient Romans, and are considered a delicacy in parts of Europe, Asia, and the Pacific Northwest. A lamprey pie weighing 20 pounds was served at the coronation of Queen Elizabeth II.

In the Midwest, we often think of lampreys as invasive species that are wreaking havoc on native fish in the Great Lakes. However, this is not the full story. There are a few native species of freshwater lampreys present in the area that are non-parasitic and completely harmless. Here is a group of native lampreys building a redd (like a nest) to deposit their eggs. After mating, the adults, which are unable to eat, will die. Soon their algae-eating larvae will hatch, and the cycle will continue. #lamprey #driftless #riverrestoration #fisheriesbiology

Happy #earthday! ...

day·​light·​ing [ˈdā-ˌlī-tiŋ] noun.
The process of opening up buried waterways to restore them to more natural conditions.
#wordoftheday #riverrestoration #environmental #habitat

Wangarĩ Muta Maathai, the first African woman to win the Nobel Peace Prize, was born on this day in 1940. A leading ecofeminist, Maathai founded the Green Belt Movement to organize women in rural Kenya to plant trees in order to combat deforestation, earn income, and stop soil erosion. This combination of poverty reduction and environmental conservation has since been replicated around the world. #OnThisDay #intersectionalenviromentalism #restorationscience #bioengineering ...

The Upper White Pine restoration project at Nason Creek in Chelan County, Washington was awarded the Silver Award for Water Resources from ACEC Washington. Congratulations to our project partners @hansonprofessionals, @goodfellowbros, @bureau_of_reclamation, @u.s.forestservice, and @chelanpud! ...

The restoration project at Arden Park in Edina, Minnesota recently won a 2022 Grand Award from the American Council of Engineering Companies (ACEC) Minnesota. Thanks to our partners @edinamn and @minnehahacreekwd for making this happen! #riverrestoration #acec #environmentalengineering #wetlands ...