Site Details

descriptions and directions

Cottonwood Marsh photo by Peter Burke

Accessible Black Hollow Reservoir - Weld County
Ownership: None Listed
Description: Black Hollow is a sizeable reservoir that is difficult to view. Fortunately, most of the birds hang out on the side close CR 19. Depending where the birds are, the best views are from the mailboxes at the jog in the road or a 100 meters or so up the hill south of the mailboxes. Since the birds are to your east and somewhat distant afternoons are best, particularly if there are not many heat waves. Many of the gulls from the North Weld County Landfill come to rest and bathe here, and often >1000 are present, often including multiple Lesser Black-backed and Thayer's Gulls plus the occasional Glaucous Gull. Also, a smattering of grebes and ducks are often present, and in season, a handful of shorebirds can be found at a muddy inlet not far from the road. Seasonally birds such as Sage Thrasher and Mountain Bluebird are occasionally encountered along CR 19 as one heads to Black Hollow from CO-14.

Habitat: Pond/Lake/Reservoir, Hedgerow/Shelterbelt
Directions: To reach Black Hollow Reservoir, take exit 269 off of I-25 (CO 14) and go east for 6 miles to CR 19. Take a left (north) onto CR 19 and go 2 miles to the jog in the road.
Other Wildlife:
Other Attractions:

Powered By Subgurim( Maps ASP.NET

Use the form on the home page to contact the editor with corrections or to volunteer to add a site.

Other Sites in Weld County
eBird Seasonal Bar Chart

Latest Black Hollow Reservoir Sightings from eBird


CBRC Records from Black Hollow Reservoir

SpeciesAccession No.Date(s)
Iceland Gull2007-15 4/1/2007-4/29/2007
Iceland Gull2007-16 4/1/2007
Glaucous-winged Gull2015-027 03/11/2015