Contact Us

SDDOT Project Manager
Steve Gramm, P.E.
Becker-Hansen Building
700 E. Broadway Ave.
Pierre, SD  57501

HR Green Project Manager
Tim Thoreen, PMP
2550 University Ave. W.
Suite #400N
St. Paul, MN  55114

HR Green, Inc., (HR Green) is a multi-discipline professional services and construction firm offering planning, technical consulting, engineering, environmental services, and construction to clients in diverse markets. One of America’s longest operating design and construction firms, HR Green enjoys a longstanding reputation for environmental stewardship, public service and technical excellence.  The firm is consistently ranked among ENR’s Top 500 Design Firms in the United States. Founded in Cedar Rapids, Iowa in 1913, the firm now employs over 600 people in Missouri, California, Illinois, Iowa, Minnesota, Pennsylvania, South Dakota, Colorado and Texas.