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BBS Route · California · BCR 5

Korbel Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 102 species recorded across 37 survey years, still active.

102Species 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 →
37Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1972–2025Span
9Observers

Bird Species Found on California Korbel

Top 40 of 102 species by most recent count. Each links to its species trend.

Species recorded on the Korbel 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 ThrushTurdidae412025+73%1974
Chestnut-backed ChickadeeParidae272025-30%1974
Brewer's BlackbirdIcteridae232025+225%1975
Steller's JayCorvidae202025-41%1974
Band-tailed PigeonColumbidae152025+167%1974
Western TanagerCardinalidae152025-59%1974
Spotted TowheePasserellidae142025+183%1975
Barn SwallowHirundinidae132025-60%1974
Cliff SwallowHirundinidae122025+525%1979
Common RavenCorvidae102025+0%1974
White-crowned SparrowPasserellidae102025-44%1974
Northern Rough-winged SwallowHirundinidae102021+300%1979
Black-headed GrosbeakCardinalidae92025-86%1974
Violet-green SwallowHirundinidae92025+129%1976
Ruby-crowned KingletRegulidae91987+175%1982
California QuailOdontophoridae82025-70%1974
Wilson's WarblerParulidae82025-78%1974
Red-breasted NuthatchSittidae82025+11%1974
American RobinTurdidae82025-62%1974
Western Wood-PeweeTyrannidae72025-47%1974
Pacific WrenTroglodytidae72025+15%1974
Song SparrowPasserellidae62025-72%1974
Warbling VireoVireonidae62025-76%1974
Red CrossbillFringillidae62014+200%1973
California Scrub-JayCorvidae52025-18%1974
Hutton's VireoVireonidae52025-40%1974
Golden-crowned KingletRegulidae52024-46%1974
Red-winged BlackbirdIcteridae52024+33%1977
Red-breasted SapsuckerPicidae42021-43%1975
House FinchFringillidae42018+50%1978
Pine SiskinFringillidae41994-83%1974
Black-throated Gray WarblerParulidae42025+29%1974
Hermit WarblerParulidae42025-84%1974
MacGillivray's WarblerParulidae42024+88%1976
Hairy WoodpeckerPicidae42024+100%1981
Mountain QuailOdontophoridae32021-63%1974
Purple FinchFringillidae32025-15%1974
Lazuli BuntingCardinalidae32024-46%1974
BushtitAegithalidae32025+460%1976
Lesser GoldfinchFringillidae32025-67%1977

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