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BBS Route · Alaska · BCR 4

Tower Bluffs Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 55 species recorded across 27 survey years, still active.

55Species 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 →
27Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1994–2025Span
6Observers

Bird Species Found on Alaska Tower Bluffs

Top 40 of 55 species by most recent count. Each links to its species trend.

Species recorded on the Tower Bluffs 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 ThrushTurdidae952025+221%1996
Alder FlycatcherTyrannidae292025+32%1996
Canada JayCorvidae192025+100%1996
Lincoln's SparrowPasserellidae182025+414%2001
Ruby-crowned KingletRegulidae142025-8%1996
American RobinTurdidae122025+22%1996
Common RavenCorvidae82025-46%2000
Bohemian WaxwingBombycillidae62025-47%2002
Boreal ChickadeeParidae42025+8%2000
Fox SparrowPasserellidae42023+33%2002
Western Wood-PeweeTyrannidae42022+150%2008
Orange-crowned WarblerParulidae32025-75%1996
Hermit ThrushTurdidae32016-90%1996
Varied ThrushTurdidae32022-70%1996
White-winged CrossbillFringillidae32023-66%2002
Canada GooseAnatidae32022+50%1997
Violet-green SwallowHirundinidae22007+154%1996
Trumpeter SwanAnatidae22023+0%2013
Red-necked GrebePodicipedidae22013n/an/a
Hairy WoodpeckerPicidae22017+100%2016
Black-backed WoodpeckerPicidae22022n/an/a
Olive-sided FlycatcherTyrannidae12025-32%1996
Wilson's WarblerParulidae12023-65%1997
Black-capped ChickadeeParidae12022-13%2003
Wilson's SnipeScolopacidae12004-50%1996
Northern WaterthrushParulidae11995n/an/a
Short-billed GullLaridae11996n/an/a
Spotted SandpiperScolopacidae12014+0%1996
Bald EagleAccipitridae12008+0%1996
Great Horned OwlStrigidae12025-25%2004
Downy WoodpeckerPicidae12011-67%1996
White-crowned SparrowPasserellidae12025+120%2000
Blackpoll WarblerParulidae12019+0%2016
Townsend's WarblerParulidae12023+0%2000
Red-tailed HawkAccipitridae12007+0%1997
Hammond's FlycatcherTyrannidae12023+60%2001
Northern ShrikeLaniidae11997n/an/a
Yellow WarblerParulidae12023-75%2008
Gray-cheeked ThrushTurdidae12015+33%2003
Chipping SparrowPasserellidae12025+467%2003

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