The City of Ft. Collins was concerned about the water quality from developed land that runs off directly into the Poudre River. Nuisance or low flow conditions were of particular concern. ERC designed and constructed a 2-acre treatment wetland to intercept and filter flows before their release to the river. The wetland system included a staged hydraulic control feature that routes lower flows through the treatment wetland while allowing peak storm flows to bypass the wetland. ERC’s design included a soil matrix and natural vegetation for biofiltering, fine sediment removal and uptake of pollutants. The wetland provided the secondary benefit of creating wildlife habitat along the river corridor.