BirdAnalyst
BBS Route · California · BCR 15

Downieville Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 103 species recorded across 47 survey years, still active.

103Species 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 →
47Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1975–2024Span
4Observers

Bird Species Found on California Downieville

Top 40 of 103 species by most recent count. Each links to its species trend.

Species recorded on the Downieville 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
Black-headed GrosbeakCardinalidae272024+16%1977
Nashville WarblerParulidae252024+171%1977
Red-breasted NuthatchSittidae212024-22%1978
Western TanagerCardinalidae202024+9%1977
Steller's JayCorvidae172024-33%1977
Hermit WarblerParulidae172024+9%1978
Spotted TowheePasserellidae162024-17%1977
Cassin's VireoVireonidae142024+13%1977
Mountain ChickadeeParidae92024-63%1977
Chipping SparrowPasserellidae82022-36%1977
American RobinTurdidae82024-38%1977
Western Wood-PeweeTyrannidae72024-57%1977
Song SparrowPasserellidae72024+56%1977
Fox SparrowPasserellidae62024-56%1977
Brown CreeperCerthiidae62024-6%1977
Warbling VireoVireonidae52024-41%1977
Golden-crowned KingletRegulidae52024+240%1978
Black-throated Gray WarblerParulidae42024-38%1978
Double-crested CormorantPhalacrocoracidae42007n/an/a
Canada GooseAnatidae42014n/an/a
Common NighthawkCaprimulgidae32013-22%1977
Dusky FlycatcherTyrannidae32024-71%1979
Barn SwallowHirundinidae32019+123%1977
Tree SwallowHirundinidae32024+17%1977
Hermit ThrushTurdidae32021+17%1977
Yellow WarblerParulidae32024-65%1978
BushtitAegithalidae32019-50%1985
Band-tailed PigeonColumbidae22024-96%1977
Williamson's SapsuckerPicidae21975n/an/a
Olive-sided FlycatcherTyrannidae22024-88%1977
Brewer's BlackbirdIcteridae22022-76%1977
Purple FinchFringillidae22023-80%1977
Lesser GoldfinchFringillidae22023+50%1979
Green-tailed TowheePasserellidae22013-38%1982
Lazuli BuntingCardinalidae22024-69%1978
Cliff SwallowHirundinidae22024-78%1977
Violet-green SwallowHirundinidae21996-7%1984
Wilson's WarblerParulidae22019+100%1977
Pacific WrenTroglodytidae22024-14%1977
Brown-headed CowbirdIcteridae22024-50%1978

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