BirdAnalyst
BBS Route · Colorado · BCR 16

Black Sulphur Cr Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 74 species recorded across 10 survey years, still active.

74Species 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 →
10Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2015–2025Span
1Observers

Bird Species Found on Colorado Black Sulphur Cr

Top 40 of 74 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
Green-tailed TowheePasserellidae432025-4%2017
Brewer's SparrowPasserellidae402025+12%2017
Brewer's BlackbirdIcteridae352025+212%2017
Mourning DoveColumbidae242025-8%2017
Blue-gray GnatcatcherPolioptilidae152025+80%2017
Broad-tailed HummingbirdTrochilidae112024-19%2017
American RobinTurdidae102025-11%2017
Vesper SparrowPasserellidae92025+13%2017
Mountain BluebirdTurdidae92025-31%2017
Say's PhoebeTyrannidae82025+64%2017
Common RavenCorvidae82025-43%2017
Song SparrowPasserellidae82025-35%2017
Spotted TowheePasserellidae82025-18%2017
Red-winged BlackbirdIcteridae72025-14%2017
Barn SwallowHirundinidae72025-8%2017
Ash-throated FlycatcherTyrannidae62025-35%2017
Violet-green SwallowHirundinidae62025-3%2017
Mountain ChickadeeParidae62024+33%2018
Red-tailed HawkAccipitridae52025+29%2017
Clark's NutcrackerCorvidae52022-44%2018
Rock WrenTroglodytidae52025-35%2017
Northern House WrenTroglodytidae52025-11%2017
Greater Sage-GrousePhasianidae52022+400%2017
Black-billed MagpieCorvidae42025-34%2017
Pine SiskinFringillidae42015n/an/a
Black-headed GrosbeakCardinalidae42025-8%2017
Cliff SwallowHirundinidae42021+60%2016
Hermit ThrushTurdidae42024+50%2019
MallardAnatidae32024+0%2016
Brown-headed CowbirdIcteridae32018+25%2016
Cassin's FinchFringillidae32021-70%2015
Warbling VireoVireonidae32025-23%2017
Virginia's WarblerParulidae32025+143%2017
Orange-crowned WarblerParulidae32025+175%2017
Black-throated Gray WarblerParulidae32025+60%2017
MacGillivray's WarblerParulidae32025-21%2018
Northern Rough-winged SwallowHirundinidae32024n/an/a
Wilson's SnipeScolopacidae22025+0%2017
Cooper's HawkAccipitridae22025+100%2015
American KestrelFalconidae22025-29%2018

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