Fish Passage

For both upstream and downstream passage for a multitude of species.

Our scientists and engineers have broad experience designing, modeling, and testing fish passageways, including ladders, lifts, and natural channels. We work with clients to determine the best approach for providing fish passage or improving an existing fishway. Our team routinely performs biological field and laboratory studies to determine the efficacy of fish passage devices. It’s also common for our clients to benefit on physical and computational fluid dynamic (CFD) modeling, the results of which we use to help map flow and optimize fish passage designs.

Our long standing working relationship with FERC, USFWS, NOAA and many regional, state, and local agencies benefits our clients looking for licensing support or agency consultation.


"I know the Staff at Alden is ready to help me solve whatever challenge I have. We’ve developed a great partnership as a result of our project work."
Compliance Lead
Compliance Lead Hydropower Dam