Dog Parks

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Parks, Open Space and Trails


  • Dogs must be licensed and vaccinated.
  • No puppies under 4 months are allowed (parvo virus disease)
  • Please keep your dog on leash until you are inside the park and keep your leash on hand. Close the gate behind you.
  • The limit is 3 dogs per person, per visit.
  • Dogs may not be left unattended.
  • If there are other dogs in the park, please keep your dog on leash until you are sure they are compatible.
  • Dogs in heat are prohibited. Spayed/neutered dogs are recommended.
  • No aggressive dogs allowed. If any person or dog is bitten by a dog at the park, report it to the Longmont Police Department Animal Control Office, (303) 651-8501.
  • Dog owners must be responsible. By removing your dog's leash, you are guaranteeing to other park users that your dog is safe.
  • Please pick up after your dog. The success of the parks depends on owners taking responsibility for their dogs.
  • Young children must be supervised by a responsible adult.

Dog Park Courtesies

  • Help keep the area clean and odor free.
  • Keep the dogs on the sidewalk while traveling to and from the dog park.
  • Keep dogs off of private property.
  • Encourage other users to clean up after their pets at all times.

Note: parks may be closed during the year to allow the grass to re-establish.
Please park in designated lots.

  • Union Reservoir

    Union Reservoir Park
    1. Address:461 County Road 26
      Longmont, CO 80504
    1. BBQ Grill or Pit(s)
    2. Boat Storage
    3. Boating
    4. Dog Beach
    5. Fishing
    6. Fishing Pier
    7. Parking Lot(s)
    8. Picnic Area(s)
    9. Playground
    10. Restroom(s)
    11. Scout Circle
    12. Shelter(s)
    13. Swim Beach
    14. Volleyball Court(s) -Sand
    15. Wakeless Boating
    1. Parks
    2. Rental Space

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.

Get the full scoop on activities - including wakeless boating, dog beach, swim beach and fishing - on the Union Reservoir webpage. There, you can also find information on hours and fees, as well as day-use shelter reservations.

Beginning in 2018, there will be no more overnight camping at Union Reservoir. Areas previously used for campsites will be reconfigured to provide additional day use opportunities and parking during peak periods. These changes will produce useful benefits for a larger number of patrons to enjoy. In the long-range future, design and construction of a modern campground with both tent and RV camping is planned. Learn more on the Union Reservoir Recreation and Trail Master Plan webpage. In the meantime, alternative local and regional camping opportunities can be found at

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