Halligan, also known as North Poudre #16, is a local government-owned dam located in Larimer County, Colorado. Completed in 1970, this arch-type structure stands at a height of 78 feet and has a hydraulic height of 78 feet. With a storage capacity of 9,312 acre-feet and a drainage area of 349 square miles, Halligan primarily serves the purpose of irrigation along the North Fork Cache La Poudre River.

Despite its fair condition assessment as of October 2020, Halligan poses a high hazard potential, which warrants regular inspections and maintenance. The dam's spillway type is uncontrolled, with a width of 110 feet, and it has a maximum discharge capacity of 10,000 cubic feet per second. Additionally, the risk assessment for Halligan is moderate, indicating a level 3 risk level that necessitates ongoing monitoring and risk management measures.

Located in Fort Collins, Halligan plays a crucial role in water resource management in the region. With its significant storage capacity and vital purpose of irrigation, the dam serves as a key infrastructure for agricultural activities and water supply. As climate change continues to impact water resources, understanding and ensuring the safety and functionality of structures like Halligan is essential for sustaining water availability and resilience in the face of changing environmental conditions.