Union Reservoir currently remains open to the public, with these restrictions:
- Six-foot social distancing requirements and maximum group size of 10 is in effect.
- Visitors should have a face covering available for times when it is not possible to maintain the six-foot social distancing.
- Wakeless boating, canoeing, kayaking and paddleboarding are currently permitted.
- Boat inspections are available between 8 a.m. and 5 p.m. daily. Please remain in your vehicle while your boat is being inspected.
- Swim beach
- Dog beach
- Fishing pier
Season passes for Longmont residents are available for purchase online (with proof of a Longmont utility bill), and senior discounts are available to those who qualify. (Non-resident Season Passes are not currently available.) Daily passes are also available at the entrance gate.
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 Creek. According to Colorado water law, that made Union a true reservoir.
The Reservoir is located approximately 7 miles west of I-25.