The lake serves as a critical water storage facility for Longmont’s municipal water system.
McIntosh Lake acts as a major stopover point for migratory birds along the Central Flyway.
Bald eagles are known to nest in the cottonwood trees located along the reservoir's shoreline.
The 3.5-mile trail loop is popular for distance training due to its relatively flat elevation profile.
The lake was historically part of agricultural irrigation networks that shaped the settlement of the St. Vrain Valley.
McIntosh Lake is a 265-acre reservoir in Longmont, Colorado, offering an expansive 3.5-mile loop trail around the water. The lake serves as a primary irrigation source for the city and provides significant habitat for migratory waterfowl and bald eagles. The perimeter trail is surfaced with gravel and concrete, accommodating walkers, joggers, and cyclists. Views from the western edge of the lake feature a direct vista of the Front Range and Longs Peak. Fishing is permitted in designated areas, with the lake stocked regularly by Colorado Parks and Wildlife. Boating is restricted to non-motorized vessels, including kayaks and stand-up paddleboards. The surrounding nature area includes open space parkland with seasonal wetlands that support local biodiversity. No swimming or wading is allowed due to the lake's role as a municipal water supply.
The western shoreline during sunset provides the best framing of the water with the Rocky Mountains in the background.
Carry binoculars during winter and spring months to observe nesting bald eagles and migratory waterfowl.
The trail is highly exposed with minimal tree cover, so ensure you have sun protection regardless of the season.
Parking at the main trailhead on Harvard Street fills up quickly on weekend mornings.
Do not attempt to swim or wade in the water, as these activities are prohibited to protect the city's drinking water quality.
Leash your dogs at all times, clean up pet waste immediately, and stay on marked trails to protect sensitive wetland habitats.
