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Union Reservoir - 0461 CR#26

Union Reservoir is a 736 acre body of water providing many outdoor recreational activities. Originally called Calkins Lake, the reservoir was carved out during the last glacial age and is one of only a few natural lakes in Colorado. In 1903, the Union Ditch Company began drilling a tunnel to release water into the St Vrain River. According to Colorado water law, that made Union a true reservoir. Today, visitors to Union Reservoir can enjoy fishing, swimming, wakeless boating, camping, windsurfing and picnicking. The Reservoir is located approximately 7 miles west of I-25. For additional information, call (303)772-1265.

FEES: Union Reservoir Fee Schedule | HOURS: Current Union Reservoir Hours | ACTIVITES: Union Reservoir Activities

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Main Picnic Area Reservations/Shelters
For a fee of $75.00 a day, you may reserve the main picnic area or the shelter for large groups - or small (additional gate fee per vehicle is required). There are picnic tables and barbecues set up in prime locations for your pleasure as well. 3.2% alcohol is permitted in the park with a permit. The fee for the alcohol permit is an additional $75.00



Sailing Club

Union Sailing Club is one of Colorado's largest and most active sailing clubs with weekly racing in the spring, summer and fall. Several regattas, social events, youth activities, and clinics open to the general sailing public are also hosted each year. Instruction is also offered. Club boats are available on a limited basis for rental to experienced sailors. For more information please go to


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