From ash pond to Riverside Wetlands: Making the business case for engineered natural technologies applies a nature valuation framework to a case study on the Tittabawassee River in Michigan. This framework was developed through a partnership with the Dow Chemical Company and the Nature Conservancy to meet a goal of $1 billion in long term value for business projects that improve nature. This article explains the framework and applies it to the Tittabawassee River site.