BirdAnalyst
BBS Route · Colorado · BCR 18

Briggsdale Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 72 species recorded across 46 survey years, still active.

72Species 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 →
46Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2025Span
7Observers

Bird Species Found on Colorado Briggsdale

Top 40 of 72 species by most recent count. Each links to its species trend.

Species recorded on the Briggsdale 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
Horned LarkAlaudidae4092025+173%1970
Lark BuntingPasserellidae2972025-44%1970
Mourning DoveColumbidae1302025+130%1970
Western MeadowlarkIcteridae1112025+92%1970
California GullLaridae95202329×1986
Grasshopper SparrowPasserellidae382025+326%1970
Brewer's BlackbirdIcteridae352008+217%2003
Red-winged BlackbirdIcteridae192025+550%1970
European StarlingSturnidae162025+56%1970
House SparrowPasseridae162025+157%1970
Black TernLaridae151995n/an/a
Rock PigeonColumbidae142024-23%1970
Western KingbirdTyrannidae132025-13%1970
Burrowing OwlStrigidae122025+211%1970
Blue-winged TealAnatidae112023+450%1980
Ring-billed GullLaridae112023+175%1991
Wilson's PhalaropeScolopacidae101996+233%1989
Common GrackleIcteridae92025+436%1970
Brown-headed CowbirdIcteridae82024+200%1993
Swainson's HawkAccipitridae72025+291%1970
Common NighthawkCaprimulgidae62021+120%1980
Chestnut-collared LongspurCalcariidae52008+580%1987
Great Horned OwlStrigidae52024+0%1986
American RobinTurdidae52025+333%1991
American White PelicanPelecanidae52024-72%1997
Eurasian Collared-DoveColumbidae52025+109%2021
Green-winged TealAnatidae52023n/an/a
American AvocetRecurvirostridae42024+150%1978
Northern PintailAnatidae41989-43%1983
Ring-necked PheasantPhasianidae32002-90%1970
Northern HarrierAccipitridae32025-11%1970
Black-billed MagpieCorvidae32005+67%1970
Loggerhead ShrikeLaniidae32025+40%1972
Yellow-headed BlackbirdIcteridae31990n/an/a
Cliff SwallowHirundinidae32021+300%2005
American KestrelFalconidae22025+25%1973
Barn SwallowHirundinidae22025+67%1970
Northern MockingbirdMimidae22025+50%1976
Prairie FalconFalconidae22018+67%1993
Northern Rough-winged SwallowHirundinidae21993-50%1990

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