Hourglass, also known as Big Beaver, is a vital water resource located in Larimer County, Colorado. Built in 1898, this Earth-type dam stands at 45 feet high and serves primarily for irrigation and water supply purposes. With a maximum storage capacity of 2180 acre-feet and a normal storage of 1729 acre-feet, Hourglass plays a crucial role in supporting the water needs of the surrounding area.

Managed by the local government, Hourglass is regulated by the Colorado Department of Water Resources, ensuring that the dam meets state standards for inspection, permitting, and enforcement. The dam's spillway, with a width of 120 feet, is uncontrolled, adding to the high hazard potential of the structure. Despite the moderate risk assessment, Hourglass has been assessed as in satisfactory condition as of July 2020, highlighting its importance in maintaining a reliable water supply for the region.

With its strategic location on Beaver Creek-TR, Hourglass serves as a key component of the water infrastructure in Fort Collins, Colorado. As water resource and climate enthusiasts, understanding the intricacies of Hourglass and its role in water supply management is essential for ensuring the sustainability and resilience of the region's water resources in the face of changing climate patterns and increasing water demands.