North American Fly

Oakridge Engineering, Inc. purchased Tiry Engineering, Inc. (specializing in agricultural sites and small dams) in July 2017. Tiry Engineering had been founded in April 1994 by Michael J. Tiry. Mike has over 50 years of experience engineering for farmers and is still on staff at Oakridge. Today, Oakridge serves solid waste as well as agriculture, water, and commercial clients.

Committed to quality, knowledgeable, trusted, and efficient - our goal is to be what you would want your Engineering Department to be.


Our clients trust our designs for the quality we put in them. Our mission is to be your Engineering Department. Trustworthy, detailed, efficient -- we work to be everything your engineer should be.

Monroe County Landfill
Daley Farms

Our stave hold professional engineer licenses in Arizona, Iowa, Minnesota, New York, Wisconsin, and Wyoming.  We are NCEES certified, so we can obtain a professional engineer license easily in almost any state. Staff are also a TSP (technical service providers) with NRCS. We are members of DBA, PDPW, MN Milk, ASCE, ASABE, and SWANA.

Erik grew up in a small town in Northeast Wisconsin, received his bachelor in civil engineering from Michigan Tech, and has over 15 years of experience in private consulting.  He currently is vice president and safety ambassador of the Wisconsin Badger SWANA chapter.