clientCapitol Region Watershed District
locationSt. Paul, Minnesota
repairing rather than replacing aging storm sewer saves $13 million
Severe cracking, settling, and seepage in the Trout Brook storm-sewer interceptor system in St. Paul led the Capitol Region Watershed District to consider rerouting one reach. Barr provided third-party review of the original feasibility study, conducted additional investigations, and then recommended repair rather than replacement. To complete repairs before spring floods, a detailed design that would ordinarily have taken six months was finished in three, and repairs were carried out in late 2008 and early 2009, during one of the continuously coldest winters on record. Work included replacing a 200-foot section without enough overhead clearance for conventional construction methods and repairing a mile of concrete tunnel. With design and construction costs totaling a fraction of what was originally recommended, Barr saved CRWD about $13 million. The project received a 2010 Engineering Excellence award from the American Council of Engineering Companies of Minnesota and was named one of the 2010 Seven Wonders of Engineering by the Minnesota Society of Professional Engineers.