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Emergency Storm Outfall Repair

Denver, Colorado

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The Muller stormwater and structures group along with Naranjo Civil Constructors and Habitat Management Environmental & Natural Resources Services assisted the City and County of Denver, Mile High Flood District (MHFD), and CDOT to perform an emergency repair of a large diameter storm sewer outfall along the South Platte River.

The original 54-inch storm sewer near the I-25 offramp to South Platte River Drive (across the river from Johnson Habitat Park) had failed and the large scour hole that had formed was only 2 feet away from undercutting the roadway. The interim emergency repairs included a pipe extension, sheet pile, and backfill to provide immediate support for the roadway embankment.  While the contractor installed the interim repairs, Muller designed the permanent outfall improvements with a deep foundation and a concrete headwall. This fast-paced, design-build approach to repairing the outfall, restoring the riverbank, and reestablishing a safe buffer between the river and I-25 took roughly 9 weeks to perform and was completed prior to higher spring flow conditions.


City and County of Denver


Stormwater & Floodplain Management
Structural & Bridge Design

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