Hensel Phelps Construction Co. is one of the largest general contractors and construction managers in the United States, ranked consistently among ENR's (Engineering News-Record) top 20 Contractors by revenue. Founded in 1937 as a small, local builder in Greeley, Colorado, Hensel Phelps has become a multibillion-dollar, employee owned national contractor with an eclectic portfolio of completed projects. Hensel Phelps currently has 11 district offices across the country, as well as additional regional offices. In August 2021, Hensel Phelps announced its acquisition of Colorado-based Hydro Construction, which specializes in construction of water and wastewater treatment facilities.