BirdAnalyst
BBS Route · Colorado · BCR 16

Willow Peak Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 90 species recorded across 25 survey years, still active.

90Species 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 →
25Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1988–2025Span
5Observers

Bird Species Found on Colorado Willow Peak

Top 40 of 90 species by most recent count. Each links to its species trend.

Species recorded on the Willow Peak 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 SparrowPasserellidae472025-42%1992
Pine SiskinFringillidae332025-24%1992
American RobinTurdidae312025-19%1992
Warbling VireoVireonidae262025+12%1992
Ruby-crowned KingletRegulidae172025-33%1996
Green-tailed TowheePasserellidae162025+40%1992
Spotted TowheePasserellidae92025+0%1992
Hermit ThrushTurdidae92025-48%1996
Pine GrosbeakFringillidae82025+36%1992
Western TanagerCardinalidae82025+113%1996
Broad-tailed HummingbirdTrochilidae72025-48%1992
Vesper SparrowPasserellidae72025-45%1992
Dusky FlycatcherTyrannidae62025-59%1996
Ring-necked DuckAnatidae62010-9%2002
MallardAnatidae52021-43%1992
Brewer's SparrowPasserellidae52025-38%1996
Lincoln's SparrowPasserellidae52025-69%1992
Violet-green SwallowHirundinidae52025+71%1996
Northern House WrenTroglodytidae52025-57%1992
Virginia's WarblerParulidae52025-41%1998
Lesser ScaupAnatidae42025-46%1992
Chipping SparrowPasserellidae42025-6%1992
Orange-crowned WarblerParulidae42025-46%1999
Black-headed GrosbeakCardinalidae42025+133%2002
Canada GooseAnatidae42005n/an/a
Swainson's HawkAccipitridae32025+60%1992
Western Wood-PeweeTyrannidae32025-63%1992
Clark's NutcrackerCorvidae32025-44%1996
Western MeadowlarkIcteridae32025-13%1996
MacGillivray's WarblerParulidae32025+83%1996
American PipitMotacillidae32025+200%1990
GadwallAnatidae32010+0%1999
Black-billed MagpieCorvidae32004n/an/a
White-winged CrossbillFringillidae32018n/an/a
Wilson's SnipeScolopacidae22021+0%2005
Spotted SandpiperScolopacidae22018-43%1996
Red-tailed HawkAccipitridae22025+33%1992
Horned LarkAlaudidae22025-77%1992
Savannah SparrowPasserellidae22018-62%1992
Cliff SwallowHirundinidae22012-91%1996

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