BirdAnalyst
BBS Route · Colorado · BCR 16

Stillwater Pass 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 71 species recorded across 13 survey years, still active.

71Species 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 →
13Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2010–2024Span
1Observers

Bird Species Found on Colorado Stillwater Pass 2

Top 40 of 71 species by most recent count. Each links to its species trend.

Species recorded on the Stillwater Pass 2 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
White-crowned SparrowPasserellidae632024+158%2012
American RobinTurdidae542024-32%2012
Lincoln's SparrowPasserellidae422024-4%2012
Song SparrowPasserellidae212024+43%2012
Pine SiskinFringillidae192024-39%2012
Broad-tailed HummingbirdTrochilidae142024-4%2012
Yellow WarblerParulidae102024-42%2012
Mountain ChickadeeParidae102024+63%2012
Ruby-crowned KingletRegulidae102024-47%2012
Mourning DoveColumbidae82024+167%2013
Green-tailed TowheePasserellidae82024+162%2012
Warbling VireoVireonidae82024-50%2012
Olive-sided FlycatcherTyrannidae72024+7%2012
Dusky FlycatcherTyrannidae72024-63%2012
Western Wood-PeweeTyrannidae62024-63%2012
Black-billed MagpieCorvidae62024+67%2014
Savannah SparrowPasserellidae52024-33%2012
Chipping SparrowPasserellidae52024-35%2012
Swainson's ThrushTurdidae52024-38%2013
Lazuli BuntingCardinalidae52024-17%2022
Spotted SandpiperScolopacidae42024+63%2012
Tree SwallowHirundinidae42023+11%2013
Violet-green SwallowHirundinidae42024-73%2012
Hermit ThrushTurdidae42024-68%2012
Great Blue HeronArdeidae42016-67%2012
Red CrossbillFringillidae32023-54%2013
Barn SwallowHirundinidae32019-25%2013
Northern House WrenTroglodytidae32024-58%2012
Red-naped SapsuckerPicidae32024-40%2013
European StarlingSturnidae22010n/an/a
Red-winged BlackbirdIcteridae22023+63%2012
Brewer's BlackbirdIcteridae22018-40%2011
Pine GrosbeakFringillidae22023+0%2012
Wilson's WarblerParulidae22023-91%2012
Canada JayCorvidae22017+33%2012
American CrowCorvidae22024-14%2014
Gray CatbirdMimidae22013n/an/a
Rock WrenTroglodytidae22024-25%2022
Turkey VultureCathartidae22016n/an/a
Ring-billed GullLaridae12010n/an/a

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