BirdAnalyst
BBS Route · Colorado · BCR 16

Stillwater Pass Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 91 species recorded across 11 survey years, no longer active.

91Species 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 →
11Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1998–2009Span
3Observers

Bird Species Found on Colorado Stillwater Pass

Top 40 of 91 species by most recent count. Each links to its species trend.

Species recorded on the Stillwater Pass 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
American RobinTurdidae1072009+47%2000
Pine SiskinFringillidae612009+471%2000
Lincoln's SparrowPasserellidae512009+517%2000
Broad-tailed HummingbirdTrochilidae442009+109%2000
Violet-green SwallowHirundinidae402009+500%2000
White-crowned SparrowPasserellidae352009+40%2000
Warbling VireoVireonidae312009+775%2002
Canada GooseAnatidae212009-57%2000
Yellow WarblerParulidae212009+775%2000
Ruby-crowned KingletRegulidae212009+629%2002
Red CrossbillFringillidae182007n/an/a
Green-tailed TowheePasserellidae172009+320%2003
Cliff SwallowHirundinidae172009+525%2000
Hermit ThrushTurdidae142009+340%2006
Ring-necked DuckAnatidae122006+209%2000
Ring-billed GullLaridae122007+550%2002
American White PelicanPelecanidae112009+75%2000
Spotted TowheePasserellidae112007+500%2005
Black-billed MagpieCorvidae92009-23%2000
Brewer's BlackbirdIcteridae92009-37%2000
Song SparrowPasserellidae92009+56%2001
Brown-headed CowbirdIcteridae82009+10%2000
Tree SwallowHirundinidae82007+16%2001
GadwallAnatidae82007-8%2002
Vesper SparrowPasserellidae82009+350%2006
Mountain ChickadeeParidae72009+360%2000
Double-crested CormorantPhalacrocoracidae72009+186%2004
Olive-sided FlycatcherTyrannidae72009+600%2002
Northern House WrenTroglodytidae72009+600%2006
Red-tailed HawkAccipitridae62009+125%2000
Steller's JayCorvidae62009+57%2001
Wilson's WarblerParulidae62007-37%2000
Lark SparrowPasserellidae62007+133%2004
Willow FlycatcherTyrannidae52007+200%2003
Dusky FlycatcherTyrannidae52009n/an/a
MallardAnatidae42007+107%2000
Spotted SandpiperScolopacidae42009+75%2002
Wilson's PhalaropeScolopacidae42003+33%2001
Pygmy NuthatchSittidae32005+0%1999
Mountain BluebirdTurdidae32009+25%2003

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