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BBS Route · Alaska · BCR 4

Willow Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 57 species recorded across 23 survey years, still active.

57Species 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 →
1993–2025Span
5Observers

Bird Species Found on Alaska Willow

Top 40 of 57 species by most recent count. Each links to its species trend.

Species recorded on the Willow 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
Swainson's ThrushTurdidae582025+34%1995
American RobinTurdidae552025+66%1995
Alder FlycatcherTyrannidae522025-5%1995
Black-capped ChickadeeParidae372025+354%1995
Varied ThrushTurdidae362025+32%1995
Northern WaterthrushParulidae142025+24%1995
Lincoln's SparrowPasserellidae122025+46%1995
White-crowned SparrowPasserellidae112025-26%1995
Ruby-crowned KingletRegulidae102024+27%1995
Common LoonGaviidae92025+240%1996
Tree SwallowHirundinidae82025-41%1995
Orange-crowned WarblerParulidae82025-75%1995
Red-breasted NuthatchSittidae72025+100%2019
Common RavenCorvidae62025+15%1996
Sandhill CraneGruidae52025+57%1996
Greater YellowlegsScolopacidae42025+17%1995
Blackpoll WarblerParulidae42025-76%1995
Wilson's WarblerParulidae42019-56%1995
White-winged CrossbillFringillidae42023+200%1999
Wilson's SnipeScolopacidae32025+71%1995
Violet-green SwallowHirundinidae32025-14%1997
Boreal ChickadeeParidae32022+67%1996
American Tree SparrowPasserellidae31996n/an/a
Short-billed GullLaridae22022-40%1995
Arctic TernLaridae21999-67%1994
Pine SiskinFringillidae22021-66%1995
Black-billed MagpieCorvidae22025-50%1996
Bank SwallowHirundinidae21994n/an/a
Bohemian WaxwingBombycillidae21998n/an/a
Red-necked GrebePodicipedidae22024+100%2001
Lesser YellowlegsScolopacidae22024+20%2009
Bald EagleAccipitridae12025+0%1993
Western Wood-PeweeTyrannidae12025-75%1996
Fox SparrowPasserellidae12007+25%1995
Cliff SwallowHirundinidae12008+0%1998
Yellow WarblerParulidae12018-63%1999
Canada JayCorvidae12025+180%1998
Golden-crowned KingletRegulidae12025+67%1997
Gray-cheeked ThrushTurdidae12007-50%1997
Hermit ThrushTurdidae12025-38%1997

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