About Riverside Engineering

James Mcmahon III, P.E.
James McMahon III, P.E., Owner

Riverside Engineering was established by James McMahon III, P.E. in 2011 as a resource for technical information and to provide design and permitting assistance to landowners and municipalities in northern New England. Jim graduated with a Bachelor's Degree in Civil Engineering from Wentworth Institute of Technology in 2003, and he earned his Master's Degree from the University of New Hampshire in 2007. He explored wetland and soil science at the University of New Hampshire, earned a Certificate in US Army Corps of Engineers Wetlands Mapping in 2010, and pursues soil classification and wetland mapping to strengthen his design base.

New Hampshire Department of Transportation

In 2012, Jim accepted a position as a Civil Engineer for the New Hampshire Department of Transportation. He reviews designs for compliance with DOT policies and specifications, and for this reason, Riverside Engineering refrains from working on transportation or infrastructure projects within the NH State right of way.

Professional Membership

Jim is licensed as a Professional Engineer in New Hampshire, Vermont and Maine, and retains membership in the following local affiliations:


Coastal Marine Sediments Soil Map Coastal Marine Sediments

This study explores concerns using the National and Regional hydric soil indicators for sediments found along the coastline in Maine, New Hampshire, and Massachusetts. The authors consider a new Hydric indicator be added to the Regional System. Jim worked with the corresponding authors to prepare the document and assisted with groundwater and soil temperature data analysis.

Ion Exchange Resin Photo Removing Radium-226 Contamination From Ion Exchange Resins Used in Drinking Water Treatment

Improper cleaning of cation exchange resins used to remove naturally occurring radioactivity in groundwater limits the effectiveness to treat to drinking water standards, decreases the life expectancy and increases the amount of radioactivity in treatment residuals. The recent implementatio of the Radionuclides Rule by the USEPA identifies a need to determine the most influential cleaning factors so that cleaning techniques may be modified so that cleaning conditions are optimized.

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