March 9, 2021

Cottonwood Siphon Project Named 2020 H2O Project Award Winner

The Colorado Contractors Association has chosen the Cottonwood Siphon Project as the Best Slipline Project under $6 million as part of the 2020 H2O Awards Program. Dewberry will also receive an award for engineering services on the project. 

The Cottonwood Siphon Rehabilitation Project was a joint works project between Northern Water and the U.S. Bureau of Reclamation. The siphon was constructed in the 1950s and carries Colorado-Big Thompson Project and Windy Gap water from Flatiron Reservoir, underneath Cottonwood Creek and Larimer County Road W 18E (Pole Hill Road), to Horsetooth Reservoir. Inspectors determined that the siphon required rehabilitation to provide continued service.   

Crews worked on the project from June 2020 to October 2020, shaving nearly one month off the schedule to help resume hydropower generation needed in Estes Park due to the Cameron Peak Fire.