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BBS Route · Alaska · BCR 4

Koyukuk Riv. Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 52 species recorded across 6 survey years, no longer active.

52Species 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 →
6Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1993–2001Span
3Observers

Bird Species Found on Alaska Koyukuk Riv.

Top 40 of 52 species by most recent count. Each links to its species trend.

Species recorded on the Koyukuk Riv. 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 ThrushTurdidae442001+90%1995
Bank SwallowHirundinidae422001+20%1995
Wilson's SnipeScolopacidae332001+236%1995
Fox SparrowPasserellidae322001+282%1995
Northern WaterthrushParulidae322001+239%1995
Canada GooseAnatidae222001+4%1995
Ruby-crowned KingletRegulidae162001+850%1995
Lesser ScaupAnatidae161995n/an/a
Yellow WarblerParulidae152001-16%1995
Northern ShovelerAnatidae141995+367%1993
Varied ThrushTurdidae142001+544%1995
Alder FlycatcherTyrannidae132001+61%1995
White-crowned SparrowPasserellidae92001+28%1995
Orange-crowned WarblerParulidae72001+13%1995
American RobinTurdidae72001+74%1995
Lesser YellowlegsScolopacidae62001+220%1995
Spotted SandpiperScolopacidae52001-26%1995
Wilson's WarblerParulidae52001-38%1993
White-winged CrossbillFringillidae42001-50%1998
Greater White-fronted GooseAnatidae42001-78%1999
Canada JayCorvidae32001+50%1995
Sandhill CraneGruidae32001+17%1998
Solitary SandpiperScolopacidae32001+200%1998
BuffleheadAnatidae32001+50%1999
Short-billed GullLaridae22001-50%1993
Semipalmated PloverCharadriidae22001-60%1993
Gray-cheeked ThrushTurdidae22001+100%1994
Northern PintailAnatidae21995+0%1994
Olive-sided FlycatcherTyrannidae22001-50%1998
Rusty BlackbirdIcteridae22001+100%1994
Savannah SparrowPasserellidae22001+50%1998
Hermit ThrushTurdidae21995+100%1994
RedheadAnatidae21995n/an/a
Common RavenCorvidae22001-33%1995
Ruffed GrousePhasianidae22001+0%1998
Chipping SparrowPasserellidae21998n/an/a
American WigeonAnatidae12001-85%1994
Rough-legged HawkAccipitridae11993n/an/a
American Three-toed WoodpeckerPicidae11993n/an/a
Blackpoll WarblerParulidae11999-50%1993

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