30 Shrewsbury Street
Holden, MA 01520-1843 USA

phone: +1 508-829-6000
fax: +1 508-829-5939




"They are unbelievably knowledgeable about what's going on with respect to fish protection and fish passage work in North America. I'm amazed that they continue to grow, which to me is a strong testimonial to their broad appeal to many utilities or water users."  David Michaud, Senior Environmental Scientist, WE Energies, commenting on Alden's Environmental Services Group.


"If I need a physical model, they're the first people I think of."  Lloyd Fitzpatrick, Vice President, Burk-Kleinpeter, commenting on Alden's Hydraulic Modeling Group.

"They'd be the only people I'd consider.  You don't mess around with something that works.  We have established such a good working relationship.  I know that if there was a problem, I could pick up the phone and get it resolved quickly."  Edmond Pepper, Vice President, Pepper & Associates, commenting on Alden's Hydraulic Modeling Group.

Alden offers a wide variety of services related to flow issues.  Please click on the links below to see an overview of each area of expertise.  Visit the links to left-hand side of this page for more detailed information.

Hydraulic Modeling

Numeric Modeling

Air & Gas


Environmental Engineering

Environmental Services

316b Compliance

Erosion Modeling

Fish Protection

Pilot Scale Studies