Level 2 Fire Restrictions in effect for western areas of Boulder County. No fireworks, fires, open flame, or shooting (see map and flyer).

Many County services are being offered online. Additionally, a variety of resources are available for those impacted by COVID-19.

Lagerman Agricultural Preserve
Lagerman Reservoir

Lagerman Agricultural Preserve

SAFETY NOTICE: Visitors must bring a face covering, stay six feet apart, and follow all rules and regulations. Learn More
Blue-green algae may be present at Lagerman Reservoir. When in doubt, just stay out! Learn More

Lagerman Agricultural Preserve is a place enjoyed by anglers, birders, boaters, picnickers, and dog-walkers. Lagerman Reservoir boasts some of the best warm-water fishing around. With a seasonal osprey nest, wetlands, and a picnic site, there’s something for the entire family.

Lagerman TrailHiking Allowed Dogs Allowed Bikes Allowed E-bikes Allowed Horses Allowed
1.6 miles – Easy
Open Sky LoopHiking Allowed Dogs Allowed Bikes Allowed E-bikes Allowed Horses Allowed
4.9 miles – Easy

Picnic Areas

50 person group shelter available at a first-come, first-served basis.


Available at the trailhead.


The Lagerman Reservoir parking lot can accommodate 27 cars and 5 horse or boat trailers. Trailer parking spaces are a maximum length of 30 feet. Vehicle and trailer combinations longer than 30 feet are recommended to park along Pike Road.

The trailhead will be reconstructed in 2020 to accommodate longer vehicle and trailer combinations.

Keep in Mind

  • From April 1 – August 31, the western end of the reservoir is closed for nesting birds.
  • Swimming and wading are prohibited.
  • Hiking, horseback riding, bicycling, & dog walking are permitted.

Management Plan

Fishing at Lagerman Reservoir

Fishing at Lagerman Reservoir is not recommended at this time.
There was a complete fish die-off in late 2018 due to poor oxygen levels.
Staff are investigating ways to improve water quality and restore fishing to Lagerman Reservoir.

Boating Regulations

What’s Allowed

  • Boats, canoes, kayaks, stand up paddle boards (SUP), and inflatables where you sit out of the water are allowed.
  • Sailboards and sailboats are prohibited.

Personal Flotation Devices (PFD)

  • A USCG approved Type I, II, or III PFD is required for each person on board.
  • PFDs should be readily accessible.
  • Boats 16 feet in length or longer require one additional Type IV PDF which should be readily accessible.
  • Children 12 years old or younger are required to wear a PFD.
  • All PFDs should be appropriately sized and in good condition.

Motorized Boats

  • Motorized boats require a current registration on board.
  • Fire extinguisher is required on board for permanently installed fuel tanks.
  • Motorized boats with electric or gasoline powered motors of 8 horsepower or less are allowed.
  • Any motorized boat with a motor larger than 8 horsepower shall have that motor’s propeller lifted out of the water at all times.
  • No-wake speed only.

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.


  • Black-tailed prairie dog
  • Coyote
  • Desert cottontail
  • Little brown bat
  • Raccoon
  • Red fox
  • Western harvest mouse


  • American avocet
  • American crow
  • American kestrel
  • American widgeon
  • American white pelican
  • Bald eagle
  • Barn swallow
  • Black-billed magpie
  • Black-crowned night heron
  • Canada goose
  • Common raven
  • Double-crested cormorant
  • Great blue heron
  • Great egret
  • Great horned owl
  • Killdeer
  • Mallard
  • Mourning dove
  • Osprey
  • Pied-billed grebe
  • Red-tailed hawk
  • Red-winged blackbird
  • Ring-billed gull
  • Rock dove
  • Snowy egret
  • Song sparrow
  • Swainson’s hawk
  • Western grebe
  • Western kingbird
  • Western meadowlark

Amphibians & Reptiles

  • Western painted turtle
  • Bullsnake
  • Western plains garter snake


  • Black crappie
  • Bluegill
  • Channel catfish
  • Gizzard shad
  • Largemouth bass
  • Tiger muskie
  • Walleye

Coming Soon

Swedish Heritage

Reverend Frederick Lagerman was pastor of the 1878 “Swedish Evangelical Congregation of Ryssby, Boulder County, Colorado” Lutheran Church. The church congregation purchased 160 acres of land near the current reservoir as a prastgard, or pastor’s garden. As was Swedish custom, church members farmed the land, giving the bounty to the pastor as his salary. The irrigation reservoir for the prastgard was listed on state records as Lagerman Reservoir.

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

Parks are open sunrise to sunset

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