Duck Lake is a small, shallow body of water in eastern Larimer County near the town of Windsor, Colorado. Situated along Highway 392 at a low elevation on the northern Colorado plains, this lake draws attention less for recreation and more for the persistent algae blooms that dominate its warm-weather character. With a 2.8 rating from visitors, Duck Lake stands as a cautionary example of the water quality challenges facing plains lakes along the Front Range.
During summer months, Duck Lake produces heavy algal growth that generates strong odors detectable from miles away. Residents in surrounding neighborhoods report the smell carrying on evening breezes, and drivers along Highway 392 frequently notice it with windows down. The algae blooms are a recurring seasonal event tied to warm temperatures, shallow water depth, and nutrient loading common in agricultural landscapes. These conditions make the lake inhospitable for swimming, fishing, or any direct water contact during the warmer months.
Outside of algae season, Duck Lake offers limited wildlife viewing opportunities. Waterfowl occasionally use the lake as a stopover, and the surrounding grasslands support typical plains bird species. However, there are no developed trails, boat ramps, restrooms, or designated parking areas. The lake lacks any formal public access infrastructure, and visitors should not expect the amenities found at managed reservoir parks elsewhere in Larimer County.
For those interested in Larimer County water recreation, better options include nearby Fossil Creek Reservoir, Boyd Lake State Park, or Horsetooth Reservoir, all of which offer developed facilities and actively managed water quality. Duck Lake serves primarily as a visual landmark along Highway 392 and a reminder of the ecological pressures facing small prairie water bodies in northern Colorado. Local advocacy groups have periodically called for remediation efforts, though no formal plans have been implemented. Visitors driving through the area during summer should be prepared for the strong odors associated with the seasonal algae blooms.