BirdAnalyst
BBS Route · Colorado · BCR 18

Gilpin Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 69 species recorded across 36 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 →
36Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1970–2024Span
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 MeadowlarkIcteridae1092024-11%1972
Horned LarkAlaudidae762024-53%1972
Cassin's SparrowPasserellidae702024+31%1972
Cliff SwallowHirundinidae672024-18%1972
Mourning DoveColumbidae632024+71%1972
Lark BuntingPasserellidae252024-22%1972
House SparrowPasseridae232024+18%1972
European StarlingSturnidae20202413×1973
Rock PigeonColumbidae192024+207%1979
Burrowing OwlStrigidae152024+463%1975
Chihuahuan RavenCorvidae14202413×1977
Western KingbirdTyrannidae122024+21%1972
Red-winged BlackbirdIcteridae122024+800%1974
DickcisselCardinalidae112024+425%2019
House FinchFringillidae102011+500%1992
Grasshopper SparrowPasserellidae92024+46%1973
Swainson's HawkAccipitridae82024+140%1972
Red-tailed HawkAccipitridae82024+167%1980
Brown-headed CowbirdIcteridae82024+333%1974
Northern MockingbirdMimidae72024+24%1972
Brewer's BlackbirdIcteridae71984+175%1982
Say's PhoebeTyrannidae62024+50%1977
Lark SparrowPasserellidae62024+160%1972
Barn SwallowHirundinidae62024+38%1974
Mountain PloverCharadriidae52011+31%1972
Common NighthawkCaprimulgidae52024-31%1972
Cassin's KingbirdTyrannidae52024+30%1994
Canyon TowheePasserellidae51997+400%1995
Black-billed MagpieCorvidae42024+200%1995
Great Blue HeronArdeidae42016+100%1999
Chipping SparrowPasserellidae42023+100%2002
Eurasian Collared-DoveColumbidae42024+75%2019
Scaled QuailOdontophoridae32017-46%1972
American KestrelFalconidae32024+50%1973
Bullock's OrioleIcteridae32024+33%1975
Loggerhead ShrikeLaniidae32024+233%1986
Northern HarrierAccipitridae32011+100%1995
Golden EagleAccipitridae32011+20%1993
KilldeerCharadriidae22024-25%1972
Ferruginous HawkAccipitridae22024+133%1977

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.