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Red Rocks Amphitheatre

Morrison, Colorado


City and County of Denver, Colorado


Jacobs Engineering


SEMA Construction


January, 2017

Technical Description:

  • (2) CDS Hydrodynamic Separators
  • 447 LF of 120" Aluminized Steel Type 2 

Red Rocks is an iconic open-air amphitheater located just west of Dever, Co. The site is nestled in the perfect acoustic surroundings of Red Rocks, and has hosted notable performers including The Beatles, Jimi Hendrix, and U2. 

In 2017 improvements were made to the Upper North Parking Lot to address erosion, stormwater control, and to improve the usability of the lot. The dirt and gravel lot was quite steep, and stormwater would regularly cut ruts across the lot, which was a nuisance for visitors and would require constant maintenance.

Jacobs Engineering designed an underground detention system made from 447 LF of 120" Aluminized Steel Type 2 capable of storing both the 100-year detention volume & the water quality volume.Using large diameter, 120” pipe allowed engineers to achieve the storage volume in the smallest possible footprint. It also results in reduced excavation cost for the contractor.

The detention system was pretreated using two CDS hydrodynamic separators. By capturing the majority of sediment, trash, and debris upstream of the detention system, maintenance becomes much easier as the material is congregated into a smaller device with clear access for cleanout.

The detention system was placed underneath the parking lot that was graded to make it flatter and more usable. A wide sidewalk around the lot was also added to provide safe separation between pedestrians and autos and improve traffic flow into and out of the lot. New landscaping features were added and the lot was paved and a topcoat applied so that it would match the natural colors of Red Rocks. 

Technical Description:

  • (2) CDS Hydrodynamic Separators
  • 447 LF of 120" Aluminized Steel Type 2 

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