Gross Reservoir, with 440 acres of surface area, nestles among low mountains in the Front Range southwest of Boulder. The lake, owned by Denver Water, is formed by a 340-foot-high concrete dam on South Boulder Creek. It’s filled with water from western Colorado that’s pumped under the Continental Divide through the Moffat Tunnel. Gross Reservoir is a playground for Boulderites with fishing, canoeing, kayaking, standup paddling, camping, hiking, and bouldering. The lake, free and open year round, has 10.9 miles of shoreline. The lake is big enough that it’s easy to escape from other users. Four picnic areas—North Shore, South Shore, Windy Point, and Miramonte—on the east side of the reservoir have tables, restrooms, and parking. The boat put-in is at Osprey Point on the south shore.
Recommended season(s): Year-round.