33rd Street Outfall – City and County of Denver and Urban Drainage and Flood Control District

A large storm sewer outfall for a 4' x 40' box culvert in Denver's rapidly redeveloping RiNo neighborhood called for a dynamic, custom design due to high visibility along the South Platte River Greenway, adjacency to a new park and promenade, and proximity to several high-profile redevelopment projects.

The project included a tapered culvert entrance designed to minimize the visual appearance of the outfall. Tiered retaining walls distribute the baseflows to wetland plants throughout and create a waterfall effect. The pedestrian crossing consists of a single 42’-0” span, 18’-0” out-to-out, non-voided slab on deep foundations (steel piles).

The project was completed in 2018.