BirdAnalyst
BBS Route · Colorado · BCR 16

Powderhorn Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 106 species recorded across 23 survey years, still active.

106Species 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 →
23Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1994–2023Span
4Observers

Bird Species Found on Colorado Powderhorn

Top 40 of 106 species by most recent count. Each links to its species trend.

Species recorded on the Powderhorn 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
Red-winged BlackbirdIcteridae712023+103%1996
Cliff SwallowHirundinidae672023+34%1996
Green-tailed TowheePasserellidae40202316×1996
Red CrossbillFringillidae372018+60%2006
Sage ThrasherMimidae322023+757%1996
American RobinTurdidae302023+72%1996
Brewer's SparrowPasserellidae272023+224%1996
Brewer's BlackbirdIcteridae232023+29%1996
Black-billed MagpieCorvidae222023+254%1997
Vesper SparrowPasserellidae18202313×2000
Canada GooseAnatidae182023+107%2003
Warbling VireoVireonidae152023+767%2001
Pine SiskinFringillidae142023+280%1999
Mountain BluebirdTurdidae142023+238%1996
Western TanagerCardinalidae142023+733%1998
Rock WrenTroglodytidae132023+300%2000
Western Wood-PeweeTyrannidae132023+100%2006
Common RavenCorvidae122023+450%1998
Violet-green SwallowHirundinidae112023-10%1996
Dusky FlycatcherTyrannidae112023-14%2015
Ruby-crowned KingletRegulidae102023+18%1996
Common GrackleIcteridae92001n/an/a
Western MeadowlarkIcteridae82023+14%1996
Song SparrowPasserellidae82023+100%1997
Wilson's SnipeScolopacidae82023+42%2004
Evening GrosbeakFringillidae82023+16%2019
Yellow WarblerParulidae72023+91%2001
Brown-headed CowbirdIcteridae72023+86%2002
Cassin's FinchFringillidae62023+117%2014
Williamson's SapsuckerPicidae62023+67%2008
MallardAnatidae52023+0%1998
Tree SwallowHirundinidae52023+10%1998
GadwallAnatidae52019n/an/a
Steller's JayCorvidae42022+17%1997
Northern House WrenTroglodytidae42023+300%1997
White-breasted NuthatchSittidae42023+125%2004
Mountain ChickadeeParidae42023+100%2004
MacGillivray's WarblerParulidae42023+75%2008
BushtitAegithalidae42005n/an/a
Chipping SparrowPasserellidae32023-38%2000

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