Our Work2018-12-19T02:09:34+00:00



River Island Channel & Floodplain Restoration

Metro, a regional government body, contracted Inter-Fluve to restore an abandoned gravel mine on the Clackamas River. In 1996 a 100-year rain-on-snow flood event caused the mainstem Clackamas River to breach a levee and flow through this active [...]


Wetlands & Peat Bogs

Holistic ecological restoration of cranberry bogs to native stream and wetland ecosystems was pioneered by Inter-Fluve. Today, we’re applying lessons learned to New England cranberry farms and Pacific Northwest estuaries.


Urban & Planning

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


Estuary Restoration

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


Dam Removals

From California to Maine, dams across the United States are being removed to help fish, improve safety and boost recreation. We’ve worked on over 100 dam removals and performed construction oversight on over 35.


Middle Fork John Day Oxbow

The Oxbow project on the Middle Fork John Day River was designed to enhance salmon habitat on a reach of the river whose floodplain was subjected to hydraulic dredge mining for gold in the 1930s and 1940s. [...]


Minnehaha Creek Natural Channel Restoration

Minnehaha Creek flows east into the City of Minneapolis where it meets the Mississippi River. Initially, we performed a reach assessment of the entire 21 miles of the creek (2003) that included a qualitative geomorphic evaluation of [...]


Fish Passage

Opening watersheds is a fundamental and cost effective first step to encourage the return of fish and aquatic species to their native habitats.


Fender Mill Alcove

Yakama Nation Fisheries Upper Columbia Habitat Restoration Project contracted Inter-Fluve to perform a reach assessment, and design of a 2,200-foot-long groundwater-fed side channel to provide year-round rearing habitat for summer chinook and steelhead. The side channel intercepts [...]


Clackamas River Basin

In 1877, Livingston Stone, employed by the U.S. Fish Commission to explore potential hatchery sites throughout the Columbia River Basin, professed that “probably no tributary of the Columbia has abounded so profusely with salmon in past years as this [...]


Watershed Planning & Long-term Implementation

To understand where a river is going, we need to know where it has been. Assessments are the foundation of a stream habitat restoration strategy and lead to projects in the ground.


Aerial Site Reconnaissance

A birds-eye view helps us plan, design, survey and monitor our projects. While Unmanned Aerial Vehicle (UAV) technology can’t substitute for humans being on the ground, the data we gather enhances our understanding of site opportunities and complements our existing services.


Picha Creek Channel Rehabilitation

While walking 125 miles of the Sand Creek and Credit River (MN) during a watershed-level assessment, we identified over 200 restoration projects and ranked them on a 1-11 scale. Picha Creek ranked at the top for restoration [...]


Tipiliuke Spring Creek & Lake Enhancement

Tipiliuke is a world-class fly-fishing resort on a 20,000-hectare estancia at the foot of the Andes in the Patagonia region of Argentina. To increase the number of fish in the nearby Rio Chimehuin and improve angling conditions [...]


Technical Design Guidelines

In the early 1980s, there were no instruction manuals for the emerging river restoration industry. Today we regularly contribute to technical design guidelines to elevate industry best practices with various audiences and public engagement strategies.


La Center Wetlands

Inter-Fluve supported the Lower Columbia Estuary Partnership in identifying restoration opportunities, designing and constructing this large-scale floodplain reconnection project. Project design elements included breaching existing levees to reconnect surface water from the East Fork Lewis River to adjacent floodplains [...]


Horsetail Creek Floodplain Restoration

Located on the Columbia River floodplain, the 180-acre Horsetail Creek project area was dramatically impacted by construction of Interstate 1-84 and resulting diversions of the creek, as well as a pea gravel mine. Despite this legacy of [...]