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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 8,100 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.

Para información general sobre el proyecto de Halligan en español »

View Quick Facts


2020 Year in Review

From state and federal permitting to preliminary design work and stream gages – see what was accomplished in 2020. 

You've Spoken, and We've Heard You

We received approximately 60 public comment letters or statements. Together, with the U.S. Army Corps of Engineers, we’re evaluating each comment to determine next steps for the final EIS and Conceptual Mitigation Plan.

City Council Quarterly Updates

Find the past and present City Council quarterly updates here.

Explore Halligan Reservoir#

Existing Halligan Dam

Aerial image of North Fork of the Poudre River

North Fork of the Poudre River downstream of Halligan Reservoir in July

Halligan Reservoir

Halligan Reservoir

North Fork of the Poudre River downstream of Halligan Reservoir. Currently, the river runs dry several months out of the year. The Halligan Water Supply Project would restore minimum flows year-round to this part of the river, improving the river and surrounding habitat.

Aerial View of Halligan Reservoir

Halligan Dam with Water Spilling

Halligan Reservoir in the Spring

Halligan Dam and Reservoir

North Fork of the Poudre River Looking at Halligan Dam

Halligan Reservoir

Top of Halligan Dam

Halligan Reservoir Inlet

Water Spilling over Halligan Dam

Halligan Reservoir Shoreline

Halligan Reservoir Inlet

Halligan Reservoir