Wildlife of Fort Chambers / Poor Farm Property

The habitat within this property supports a range of wildlife. From mammals utilizing the riparian corridor to birds in the hay fields and forests, over 100 species have been observed on this property since it was purchased by Open Space and Mountain Parks (OSMP). The property adjoins a broader complex of preserved Boulder Creek floodplain habitats, providing wildlife with a movement corridor among riparian woodland, wetland, and irrigated meadow habitats.  The wildlife recorded utilizing these lands include:

Mammals

13 species of wild mammals were observed using a remote camera. The riparian area along Boulder Creek is part of a USFWS Preble’s meadow jumping-mouse Conservation Zone. No small mammal surveys have been conducted, to date, but various rodents have been spotted (although not pictured below) and studies on a nearby parcel detected species such as the cinereous shrew, deer mouse, and the hispid pocket mouse. White-tailed deer, racoons, and cottontail rabbits are plentiful. Bobcats have been seen hunting rabbits and fox squirrels. Beavers frequent Boulder Creek, and there is one small lodge located in one of the ponds.

Cottontail Rabbit

White-Tailed Deer

Raccoon

Mountain Lion

Bobcat

Bobcat Kittens

Black Bear

Coyote

Fox Squirrel

Mink

Red Fox

Striped Skunk

Hayfield Nesting Birds

Irrigated hayfield and floodplain habitat in the Boulder Valley, including the fields on the Fort Chambers / Poor Farm property, provide nesting habitat for a suite of specialized birds including the bobolink and savannah sparrow. Compared to other hayfield complexes on the OSMP system, the Fort Chambers / Poor Farm fields are of comparatively low quality. Bobolinks have been detected only once in four years. This indicates that the fields may only occasionally be in good condition for bobolinks. Even if the conditions were improved, the fields are small and as a result, may not support a robust breeding population of bobolinks. The fields may be suitable for males who cannot find vacant territories in nearby fields.


OSMP staff have surveyed for hayfield birds throughout the past 4 years; during these surveys, they have detected 26 bird species, including the species below:

American Kestrel

Photo courtesy of Klaus Girk

American Robin

Photo courtesy of Christian Nunes

Barn Swallow

Photo courtesy of Wendy Marie Stuart

Bobolink

*only observed in 2018


Photo courtesy of Michael Morton

Eastern Kingbird

Photo courtesy of Christian Nunes

House Wren

Photo courtesy of Kevin Smith

Killdeer

Photo courtesy of Wendy Marie Stuart

Red Tailed Hawk

Photo courtesy of Mark Holtz

Savannah Sparrow

Photo courtesy of Christian Nunes

Turkey Vulture

Photo courtesy of Christian Nunes

Yellow-Headed Blackbird

Photo courtesy of Wendy Marie Stuart

Black-capped Chickadee

Photo courtesy of Christian Nunes

Waterfowl

The four gravel mining ponds provide important habitat for overwintering and nesting waterfowl. The various depths among the ponds provide foraging opportunities for both diving ducks (e.g. mergansers, scaup) as well as dabbling ducks (e.g. northern shoveler, wood duck). The deeper ponds remain unfrozen for longer, providing a refuge for wintering waterfowl during cold periods when many other waterbodies freeze over. Cottonwoods provide nesting habitat for wood ducks, while wetland vegetation along the pond edges provide nesting habitat for mallards, Canada geese, and the Virginia rail. These ponds are part of a complex of gravel ponds spread across the Boulder Creek floodplain.


62 species of waterfowl have been observed utilizing the ponds on the Fort Chambers-Poor Farm property.

American Coot

American Wigeon

Photo courtesy of Daren O'Brien

Canada Goose

Photo courtesy of Ann Duncan

Canvasback

Photo courtesy of Wendy Marie Stuart

Cinnamon Teal

Photo courtesy of David Lawrence

Common Merganser

Photo courtesy of Leo Hudson

Mallard

Photo courtesy of Wendy Marie Stuart

Wood Duck

Photo courtesy of Leo Hudson

Songbirds

The riparian forest on Fort Chambers / Poor Farm provides breeding habitat for 31 species of migratory songbirds, including blue-gray gnatcatcher, Bullock’s oriole, common yellowthroat, eastern kingbird, western kingbird, western wood-pewee, and yellow warbler. This songbird assemblage typifies that found throughout the Boulder Creek floodplain.

American Goldfinch

Photo courtesy of Wendy Marie Stuart

Black-billed Magpie

Photo courtesy of Michael Morton

Blue-gray Gnatcatcher

Photo courtesy of Michael Morton

Bullock's Oriole

Photo courtesy of Michael Morton

Downy Woodpecker

Photo courtesy of Christian Nunes

Gray Catbird

Photo courtesy of Michael Morton

Northern Flicker

Photo courtesy of Wendy Marie Stuart

Red-winged Blackbird

Photo courtesy of Christian Nunes

Song Sparrow

Photo courtesy of Wendy Marie Stuart

Western Meadowlark

Photo courtesy of Michael Morton

White-breasted Nuthatch

Photo courtesy of Christian Nunes

Yellow Warbler

Photo courtesy of Michael Morton

Additional Resources

Future field work will more fully reveal the abundance and composition of other taxonomic groups, including fish, reptiles, amphibians, and invertebrates like butterflies. The ponds have previously been stocked with large-mouth bass, sunfish, and yellow perch. Additional fish surveys might reveal if any native fish exist in the ponds or adjacent Boulder Creek.  A single common garter snake has been seen on the property. Colorado Parks and Wildlife ranks the common garter snake as a Tier 2 Species of Greatest Conservation Need and a Species of Concern. Amphibian surveys on the adjacent Sawhill Ponds property have detected Woodhouse’s toad, boreal chorus frog, American bullfrog, and a single northern leopard frog. Common snapping turtles and western painted turtles can be found in the ponds. OSMP staff observed the Viceroy butterfly visiting milkweed flowers. Native willows, common in the wetland areas, are an important part of the Viceroy’s life cycle. The pastures and wetlands on the property might support other butterfly conservation targets, such as the regal fritillary, two-spotted skipper, or monarch.

See full list of species observed on-site: