Fossil Creek Reservoir is the centerpiece of 1,398-acre Fossil Creek Natural Area on the west side of Interstate 25 just south of Fort Collins. The once-private 754-acre lake, with a total storage capacity of 11,100 acre-feet, includes water from the Cache la Poudre River as well as treated wastewater. Stored water is mostly used for irrigation. The large reservoir offers few recreational opportunities with only hiking on four trails and wildlife watching to minimize human impact on wildlife. The area is managed for birds that live on both shortgrass prairie and the lake, including over 180 bird species like Canada geese, grebes, ospreys, and bald eagles.
Recommended season(s): Year-round.
—Stewart M. Green