BirdAnalyst
BBS Route · Colorado · BCR 16

Black Sulphur Cr Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 72 species recorded across 9 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 →
9Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2015–2024Span
1Observers

Bird Species Found on Colorado Black Sulphur Cr

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

Species recorded on the Black Sulphur Cr 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
Brewer's SparrowPasserellidae432024+4%2017
Green-tailed TowheePasserellidae342024+4%2017
American RobinTurdidae222024-5%2017
Spotted TowheePasserellidae172024-10%2017
Violet-green SwallowHirundinidae162024+3%2017
Common RavenCorvidae132024-45%2017
Blue-gray GnatcatcherPolioptilidae132024+97%2017
Mountain BluebirdTurdidae122024-39%2017
Broad-tailed HummingbirdTrochilidae112024-19%2017
Dusky FlycatcherTyrannidae102024-33%2017
Vesper SparrowPasserellidae92024+7%2017
Red-winged BlackbirdIcteridae82024-11%2017
Rock WrenTroglodytidae82024-35%2017
Brewer's BlackbirdIcteridae72024+12%2017
Song SparrowPasserellidae72024-21%2017
Virginia's WarblerParulidae72024+229%2017
Say's PhoebeTyrannidae62024+36%2017
Black-billed MagpieCorvidae62024-11%2017
Orange-crowned WarblerParulidae62024+175%2017
Mountain ChickadeeParidae62024+33%2018
Clark's NutcrackerCorvidae52022-44%2018
Greater Sage-GrousePhasianidae52022+400%2017
House FinchFringillidae42024+50%2019
Pine SiskinFringillidae42015n/an/a
Black-headed GrosbeakCardinalidae42024+8%2017
Cliff SwallowHirundinidae42021+60%2016
Barn SwallowHirundinidae42024-39%2017
Warbling VireoVireonidae42024-39%2017
Northern House WrenTroglodytidae42024-21%2017
Hermit ThrushTurdidae42024+50%2019
MallardAnatidae32024+0%2016
Brown-headed CowbirdIcteridae32018+25%2016
Cassin's FinchFringillidae32021-70%2015
Chipping SparrowPasserellidae32024-14%2017
KilldeerCharadriidae32024+200%2019
Northern Rough-winged SwallowHirundinidae32024n/an/a
Wilson's SnipeScolopacidae22023-20%2017
Mourning DoveColumbidae22024+3%2017
Red-tailed HawkAccipitridae22024-14%2017
American KestrelFalconidae22022-25%2016

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