BirdAnalyst
BBS Route · Alaska · BCR 4

Sourdough Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 81 species recorded across 26 survey years, still active.

81Species 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 →
26Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1983–2024Span
6Observers

Bird Species Found on Alaska Sourdough

Top 40 of 81 species by most recent count. Each links to its species trend.

Species recorded on the Sourdough 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 ThrushTurdidae992024+63%1990
Ruby-crowned KingletRegulidae442024+38%1990
American RobinTurdidae412024+18%1990
White-crowned SparrowPasserellidae342024-48%1990
Lincoln's SparrowPasserellidae232024+550%1990
Canada JayCorvidae212024+3%1990
Alder FlycatcherTyrannidae192024+14%1990
Lesser YellowlegsScolopacidae162024-47%1990
Harlequin DuckAnatidae141994n/an/a
Cliff SwallowHirundinidae132014-55%1993
Greater YellowlegsScolopacidae102018+163%2000
Savannah SparrowPasserellidae92024-18%1990
Common RavenCorvidae72024+114%1991
Blackpoll WarblerParulidae62024-11%1990
Wilson's SnipeScolopacidae52024-21%1990
Chipping SparrowPasserellidae52024+300%2013
Black-billed MagpieCorvidae52022+400%1998
Bonaparte's GullLaridae42001+75%1992
Tree SwallowHirundinidae42016+20%1991
Wilson's WarblerParulidae42024-36%1990
Arctic TernLaridae42017+75%1991
Red-necked PhalaropeScolopacidae42000-29%1993
Ring-necked DuckAnatidae42024+40%1999
Pine GrosbeakFringillidae32021+129%1991
Pine SiskinFringillidae32018+133%1995
Song SparrowPasserellidae32013+0%1998
Short-billed GullLaridae22024+10%1991
MallardAnatidae22023+0%1991
Western Wood-PeweeTyrannidae22024-63%1990
Bohemian WaxwingBombycillidae22023-57%1990
Orange-crowned WarblerParulidae22024+50%1990
Green-winged TealAnatidae22000+50%1990
American WigeonAnatidae22024-40%1996
Bank SwallowHirundinidae22018-60%1995
Hermit ThrushTurdidae22022-20%2008
Short-eared OwlStrigidae22017n/an/a
American Three-toed WoodpeckerPicidae22024+100%2021
Blue-winged TealAnatidae22024n/an/a
Canada GooseAnatidae12009-46%1990
Solitary SandpiperScolopacidae12009-17%1990

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