Caley Drive Piney Creek Crossing

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The East Caley Drive crossing of Piney Creek in Centennial, Colorado, had been a low water crossing since the 1970s, but it had increasingly become a safety hazard. The Urban Drainage and Flood Control District and the Southeast Metro Stormwater Authority retained Ayres to evaluate alternatives for the crossing and to design stream stabilization and a bridge at East Caley Drive.

The project team held public meetings with residents to develop the selected alternative for the crossing and to coordinate equestrian access. The project resulted in a concrete box girder bridge and associated road improvements and approximately 600 linear feet of stream stabilization in a sand bed channel. The bridge was designed to pass the 100-year flood event and to maintain the aesthetics of nearby bridges while keeping the rural feel of the neighborhood. The stream stabilization included a stepped grouted boulder drop structure upstream of the bridge and grouted boulder walls varying in height from 2 to 12 feet lining portions of the stream banks throughout the project. Ayres also provided full-time construction observation services.

The Colorado Association of State Floodplain Managers awarded the project its 2011 Grand Award for Engineering.

Project Information

Client's Name

Mile High Flood District


Centennial, CO

Primary Service

River Engineering + Water Resources


Local Government