Sable Outfall

The Sable Boulevard Regional Stormwater Drainage Outfall – Phase B project is a major regional drainage and flood resiliency initiative led by the Mile High Flood District (MHFD) and the City of Brighton. Naranjo Civil Constructors (NCC) is serving as the prime contractor, with JR Engineering as the design engineer, Western States Reclamation providing revegetation and ecological restoration services, and CORVUS Environmental supporting environmental compliance and coordination.

Located along the Sable Boulevard corridor in Brighton, Colorado, the project will improve stormwater conveyance capacity, stabilize drainage infrastructure, and restore disturbed areas with native vegetation and long-term erosion protection. The work includes construction of a new regional outfall system, precast culverts, concrete trickle channels, headwalls, maintenance access paths, grading, and channel stabilization improvements extending through multiple crossings and drainage reaches.

A key component of the project is balancing regional infrastructure improvements with environmental stewardship. Revegetation and bank protection efforts are integrated throughout construction to restore ecological function and improve long-term resilience along the corridor. Native seeding, erosion control, and reclamation measures will help stabilize disturbed soils while supporting pollinator habitat and overall watershed health. Construction activities are carefully phased to minimize disruption while maintaining access and coordinating around existing utilities, roadways, agricultural properties, and drainage infrastructure.

The phased construction schedule includes excavation and haul-off operations, installation of stormwater conveyance structures, roadway and culvert reconstruction, grading, revegetation, and final stabilization extending from spring through fall 2026. Major improvements include new outfall conveyance infrastructure along Sable Boulevard, 144th Avenue crossings, maintenance access improvements, sedimentation basin enhancements, and channel restoration features designed to improve system reliability and long-term maintainability.

By combining heavy civil infrastructure with ecological restoration and environmental coordination, the Sable Outfall Phase B project strengthens regional flood protection while improving the long-term sustainability and functionality of the surrounding drainage corridor.