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Halligan Water Supply Project

Project Overview#

Halligan Reservoir

Halligan Reservoir is an existing reservoir on the North Fork of the Poudre River, 25 miles northwest of Fort Collins.

If approved, the Halligan Water Supply Project will enlarge Halligan Reservoir by approximately 8,200 acre-feet to meet the demand of future Fort Collins Utilities' water customers and provide increased reliability for existing customers to help protect against service interruptions related to prolonged drought and emergencies.

The project will help:

  • Provide a storage reserve for emergency water supply
  • Increase drought security
  • Improve water system reliability and flexibility
  • Meet future water demands of the Fort Collins Utilities' water service area

The U.S. Army Corps of Engineers (Corps) released a draft Environmental Impact Statement (EIS) in November 2019. The Corps will develop a final EIS before making a permitting decision on if Halligan Reservoir can be expanded.

View Quick Facts

Updates#

Potential New Dam Concept Identified

Preliminary design efforts revealed that two viable dam concepts exist for enlarging Halligan Reservoir.

2021 Fieldwork

We have started preliminary design activities and alternatives evaluation for the proposed dam enlargement, with our second round of subsurface data collection starting this summer.

City Council Quarterly Updates

Find the past and present City Council quarterly updates here.

Explore Halligan Reservoir#

Halligan Dam spilling

Halligan Reservoir spilling over the existing dam in spring.

Halligan Reservoir

Halligan Reservoir north shore.

Halligan Dam

Existing Halligan dam.

Halligan Dam

Existing Halligan dam and North Fork of the Poudre River looking south west.

North Fork of the Poudre

North Fork of the Poudre River looking south downstream of Halligan Dam.

Halligan Reservoir

Halligan Reservoir in the spring.

Halligan Reservoir

Aerial view of Halligan Reservoir.

Halligan Reservoir

Halligan Reservoir in the spring.

Halligan Reservoir

Halligan Reservoir and existing dam.

Halligan Dam

North Fork of the Poudre River downstream of Halligan Dam, looking north.

Halligan Dam

Top of Halligan Dam looking south.

Halligan Dam

Water spilling over Halligan Dam in the spring.

Halligan Reservoir

The Halligan Reservoir shoreline.

Halligan Reservoir

Halligan Reservoir inlet.

Halligan Reservoir

Halligan Reservoir.