Denver County, CO Environmental Rules: Coastal Development (2026)

Denver is an inland city — 'coastal development' equivalents involve its rivers and creeks. The South Platte River bisects the city NE to SW; Cherry Creek meets it downtown; Bear Creek runs through SW Denver; Sand Creek forms the NE boundary near DEN; Clear Creek near the north. All are subject to: - DRMC §57 Floodplain Management (adopting FEMA NFIP standards) — any development within the 100-year floodplain requires a Floodplain Development Permit from DOTI. Substantial improvements or new construction must elevate to BFE + 1 foot (Denver's freeboard). - Mile High Flood District (formerly Urban Drainage and Flood Control District) regional standards - DRMC §56 stormwater requirements including riparian buffer best practices - Army Corps of Engineers Section 404 permits for any wetland fill or dredging along waterways - Denver Waterway Protection Ordinance for discharge and pollution along waterways Riparian setback distances vary but are typically 30-100 feet depending on waterway classification. The Platte River corridor hosts major restoration projects (South Platte River Vision Implementation Plan). Denver participates in FEMA's Community Rating System (CRS) earning flood insurance discounts. Major flood risk: South Platte flash flooding, Cherry Creek basin 100-year events.