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Activities at Union

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Union Reservoir currently remains open to the public during the State of Colorado's Stay at Home Order. However, the reservoir will be closed on Sunday, April 12. Read the news release >

  • Fishing, boating, dog beach and paddle boarding are open.
  • Playground and shelter are closed.
  • Social distancing requirements and maximum group size rules are in effect.
  • Boat inspections are available between 8 a.m.-5 p.m. daily. Please remain in your vehicle while your boat is being inspected.


Wakeless boating is allowed on the reservoir, jet skis are prohibited.  Mandatory boat inspections are required before launching.  Inspections are available between 8 am and 5 pm daily.

Water Conditions

Please contact the Union Reservoir Office for current information.

Paddleboard & Kayak Rentals

Rocky Mountain Paddleboard offers rentals of paddleboards and kayaks at Union Reservoir. Please visit their website to make a reservation and find additional information.

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 the Union Sailing Club website


Camping is currently not available at Union Reservoir. In 2018, areas previously used for campsites were reconfigured to provide additional day use opportunities and additional parking during peak periods. In the future, design and construction of a modern campground with both tent and RV camping is planned. The campground is slated to have full hook ups, showers, flush toilets and a dump station. Learn more in the Union Reservoir & Trail Master Plan >

Dog Off-Leash Area

A dog off-leash area is located on the south side of the reservoir. Dogs are allowed off leash and may swim in this designated area. Dogs must be leashed in all other areas of the park.


Union Reservoir is fast becoming one of Colorado's finest Walleye fisheries. Walleye 17 to 24 inches are common. In recent years, Union Reservoir has become the hotspot for fly fishermen who enjoy the thrill of catching the hard fighting Carp. In addition, a healthy population of Trout, Crappie, Catfish, Bass, Sunfish, Wiper and Tiger Muskie provide a quality fishing experience. Fishing is available along the majority of the shoreline or from a boat. Colorado fishing regulations are enforced and a fishing license is required. A fish cleaning station and handicapped accessible fishing pier are provided for your convenience.



Numerous picnic sites with table and grills are located throughout the park. Both group and individual sites are available on a first come, first served basis.



For a fee of $75.00 a day, you may reserve the main picnic area or the shelter (additional gate fee per vehicle is required). There are picnic tables and barbecues set up in prime locations for use as well.  Contact the Union Reservoir Office to reserve.  Reservations will be accepted beginning March 1. Reservations are not accepted on weekends or holidays between June 1 and Labor Day.

Special Events

Union Reservoir is commonly home to triathlons, community festivals and boating events. During such events, there may be special fees required at the gate. View our Special Events - Union Reservoir webpage to see upcoming events.


Swim Beach

Union Reservoir's sandy beaches provide a gathering spot for young and old alike. Lifeguards are stationed at the beach for safety. Swimming is allowed during posted hours only (see Hours). A sand volleyball court, picnic shelter and playground are located near the beach for your enjoyment. Temporary loading and unloading is permitted along the beach for easy access, with parking in the paved lot.

"Large pool inflatable floats, mattresses, rings, tubes and other inflatable toys that are not Coast Guard approved with 3 chambers are not allowed on the water.  Small pool toys may be permitted in the designated swim area at the discretion of the lifeguards.  Inflatable paddle boards are considered a vessel and are allowed on the water with a Coast Guard approved PFD"

Open Water Swim

Swimming outside of the designated swim beach is considered open water swimming; it is only permitted during posted Open Water Swim hours when lifeguards are on duty (see Hours).  Union Reservoir season passes or recreation facility passes are NOT accepted as a substitute for Open Water Swim (see Fees).

Please note: for the safety of all, Open Water Swims are exclusively for open water swimmers. Children and spectators are NOT allowed in the water to allow lifeguards to guard without distractions. Open Water Swim parking is available in the paved parking lot. Do not park along the beach in the kayak / canoe parking area.


One of the best windsurfing spots in northern Colorado! Easy water front access with great conditions creates a windsurfer's paradise. 

Winter Activities

During winter, Union is open from sunrise to sunset. Daily admission fees still apply, and access is limited to walk-in. No boating or ice fishing is allowed during the winter.

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