Twin Lakes
Twin Lakes

Twin Lakes

Toxic blue-green algae have been confirmed in multiple lakes and ponds in Colorado. The county is not testing for blue-green algae in open space ponds, so please take appropriate precautions. Learn More →

This open space is a haven for wetland wildlife, a hidden gem in the heart of Gunbarrel area. Whether spending a lazy afternoon fishing or having an invigorating morning jog, community enjoyment runs high here.

East Twin Lakes TrailHiking Allowed Dogs Allowed Bikes Allowed Horses Allowed
0.7 miles – Easy
Dogs must be on a leash
West Twin Lakes TrailHiking Allowed Dogs Allowed Bikes Allowed Horses Allowed
0.7 miles – Easy
Dogs off leash allowed

Class 1 and 2 e-bikes are allowed during the e-bike pilot period.


  • On-street parking only.

Picnic Areas

  • There are no picnic tables.


  • There are no restrooms.


  • Fishing is allowed.
  • Boating is not allowed.

Keep in Mind

  • Dogs must be on leash everywhere except on the West Lake Trail.
  • Wading and swimming are not allowed.
  • Regional trails and regional trail connectors are open to commuters 24 hours per day.

Documents & Plans

Wetland habitats, nestled within the surrounding Great Plains, support aquatic plant and animal life and serve to lure in large numbers of migrating bird species. With grasses, wildflowers and trees surrounding the wetlands, these areas are biologically diverse both in and out of the water.


  • Coyote
  • Eastern cottontail
  • Fox squirrel
  • Little brown bat
  • Raccoon
  • Red fox
  • Striped skunk


  • American avocet
  • American coot
  • American crow
  • American goldfinch
  • American kestrel
  • American robin
  • American widgeon
  • Belted kingfisher
  • Canada goose
  • Common grackle
  • Common raven
  • Downy woodpecker
  • Black-billed magpie
  • Black-capped chickadee
  • Bullock’s Oriole
  • Double-crested cormorant
  • Great blue heron
  • Great Horned Owl
  • Killdeer
  • Mallard
  • Mourning dove
  • Red-tailed hawk
  • Red-winged blackbird
  • Tree swallow
  • Violet-green swallow
  • Yellow-rumped warbler
  • Yellow Warbler

Amphibians & Reptiles

  • Bullsnake
  • Garter snake
  • Snapping turtle

Coming Soon

Water Rights

Since 1910, the Boulder and Left Hand Ditch Company has operated the two lakes, which are reservoirs used to store water for agriculture. Boulder and Left Hand Ditch Company still owns the rights to the water and Boulder County owns the land surrounding them.

Growing Gunbarrel

In the 1960s, thanks to the nearby IBM plant and other commercial attractions, the Gunbarrel residential area grew up around the lakes. The lakes have been central to the Gunbarrel community from the beginning.

Contact Us

Parks & Open Space

Staff Directory
Submit a Question

Office Location
5201 St. Vrain Rd.
Longmont, CO 80503
Map & Directions
Office Hours: 8 a.m. - 4:30 p.m. M-F

Parks are open sunrise to sunset

Connect With Us