BirdAnalyst
BBS Route · Colorado · BCR 16

South Fork Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 85 species recorded across 20 survey years, still active.

85Species 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 →
20Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1994–2024Span
5Observers

Bird Species Found on Colorado South Fork

Top 40 of 85 species by most recent count. Each links to its species trend.

Species recorded on the South Fork 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
Cliff SwallowHirundinidae1082002+800%1999
American RobinTurdidae482024-20%1997
Hermit ThrushTurdidae332024+4%1997
Clark's NutcrackerCorvidae312024-5%1999
Western TanagerCardinalidae272024+25%1999
Ruby-crowned KingletRegulidae252024-21%1997
Warbling VireoVireonidae212024-28%1997
Violet-green SwallowHirundinidae142024-12%1997
Red-breasted NuthatchSittidae112024+100%2001
Chipping SparrowPasserellidae92024-14%1997
American CrowCorvidae92024+246%2008
Pine SiskinFringillidae82024-82%1997
Green-tailed TowheePasserellidae82024+167%1997
Canada GooseAnatidae82024+490%2014
White-crowned SparrowPasserellidae72024-29%1997
Mountain ChickadeeParidae62024-39%1997
Broad-tailed HummingbirdTrochilidae52024-36%1997
Western Wood-PeweeTyrannidae52024-26%1997
Canada JayCorvidae52024-17%1999
MacGillivray's WarblerParulidae52022+167%2008
Steller's JayCorvidae42024-13%1997
Common MerganserAnatidae32023-42%2002
MallardAnatidae32024-61%2002
Common NighthawkCaprimulgidae32024+100%1999
Olive-sided FlycatcherTyrannidae32024-50%1999
Black-billed MagpieCorvidae32024+350%2003
Pine GrosbeakFringillidae32024+13%1997
Red-tailed HawkAccipitridae32024+100%2002
Mourning DoveColumbidae32014+200%1999
Long-eared OwlStrigidae32021+200%2017
Spotted TowheePasserellidae32024+50%2019
Dusky FlycatcherTyrannidae22013+80%2001
Cassin's FinchFringillidae22024-64%1997
Mountain BluebirdTurdidae22023-33%1999
Orange-crowned WarblerParulidae22024-33%2013
Common RavenCorvidae22024-67%2002
Red CrossbillFringillidae22024-25%2001
Golden-crowned KingletRegulidae22024-38%2003
Downy WoodpeckerPicidae22024-64%2013
Savannah SparrowPasserellidae22017+100%2002

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