BirdAnalyst
BBS Route · Colorado · BCR 18

Gilpin Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 69 species recorded across 37 survey years, still active.

69Species RecordedSpecies recordedDistinct species detected on standard-protocol BBS runs here across all years on record — a measure of survey breadth, not a complete checklist.Full methodology →
37Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1970–2025Span
4Observers

Bird Species Found on Colorado Gilpin

Top 40 of 69 species by most recent count. Each links to its species trend.

Species recorded on the Gilpin route.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
Western MeadowlarkIcteridae982025-27%1972
Mourning DoveColumbidae862025+158%1972
Cassin's SparrowPasserellidae842025+51%1972
Horned LarkAlaudidae782025-49%1972
Cliff SwallowHirundinidae742025-21%1972
Lark BuntingPasserellidae412025+41%1972
DickcisselCardinalidae36202512×2019
Red-winged BlackbirdIcteridae27202511×1974
House SparrowPasseridae272025+44%1972
European StarlingSturnidae24202512×1973
Rock PigeonColumbidae232025+336%1979
Burrowing OwlStrigidae222025+550%1975
Western KingbirdTyrannidae212025+111%1972
Barn SwallowHirundinidae182025+250%1974
Chihuahuan RavenCorvidae18202516×1977
Grasshopper SparrowPasserellidae172025+146%1973
Swainson's HawkAccipitridae152025+420%1972
Brown-headed CowbirdIcteridae152025+800%1974
Northern MockingbirdMimidae132025+43%1972
Common NighthawkCaprimulgidae112025+46%1972
Lark SparrowPasserellidae112025+320%1972
Red-tailed HawkAccipitridae112025+283%1980
House FinchFringillidae102011+500%1992
Eurasian Collared-DoveColumbidae92025+225%2019
KilldeerCharadriidae82025+50%1972
Loggerhead ShrikeLaniidae72025+367%1986
Brewer's BlackbirdIcteridae71984+175%1982
Say's PhoebeTyrannidae62025+133%1977
Common GrackleIcteridae62025+933%1982
Cassin's KingbirdTyrannidae62025+50%1994
Mountain PloverCharadriidae52011+31%1972
American KestrelFalconidae52025+100%1973
Blue GrosbeakCardinalidae52025+80%1978
Canyon TowheePasserellidae51997+400%1995
Bullock's OrioleIcteridae42025+50%1975
Ferruginous HawkAccipitridae42025+200%1977
Black-billed MagpieCorvidae42025+300%1995
Great Blue HeronArdeidae42016+100%1999
Chipping SparrowPasserellidae42023+100%2002
Great-tailed GrackleIcteridae42025-50%2023

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. A route is a sample, not a census.