BirdAnalyst
BBS Route · California · BCR 15

Downieville Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 103 species recorded across 48 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 →
48Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1975–2025Span
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
American RobinTurdidae302025-38%1977
Black-headed GrosbeakCardinalidae282025+30%1977
Spotted TowheePasserellidae272025-12%1977
Western TanagerCardinalidae202025+28%1977
Steller's JayCorvidae172025-42%1977
Red-breasted NuthatchSittidae162025-18%1978
Cassin's VireoVireonidae102025+30%1977
Nashville WarblerParulidae102025+154%1977
Hermit WarblerParulidae92025+22%1978
Chipping SparrowPasserellidae82022-36%1977
MacGillivray's WarblerParulidae82025+140%1982
Fox SparrowPasserellidae72025-47%1977
Mountain ChickadeeParidae72025-55%1977
Western Wood-PeweeTyrannidae62025-59%1977
Common RavenCorvidae62025+120%2001
Dusky FlycatcherTyrannidae42025-53%1979
Brown-headed CowbirdIcteridae42025-13%1978
Yellow WarblerParulidae42025-60%1978
Cassin's FinchFringillidae42025-33%1997
Double-crested CormorantPhalacrocoracidae42007n/an/a
Canada GooseAnatidae42014n/an/a
Band-tailed PigeonColumbidae32025-94%1977
Common NighthawkCaprimulgidae32013-22%1977
Song SparrowPasserellidae32025+44%1977
Lazuli BuntingCardinalidae32025-54%1978
Barn SwallowHirundinidae32019+123%1977
Tree SwallowHirundinidae32024+17%1977
Hermit ThrushTurdidae32021+17%1977
BushtitAegithalidae32019-50%1985
Mourning DoveColumbidae22025-29%1977
Williamson's SapsuckerPicidae21975n/an/a
Pileated WoodpeckerPicidae22025+0%1977
Olive-sided FlycatcherTyrannidae22025-88%1977
Brewer's BlackbirdIcteridae22022-76%1977
Purple FinchFringillidae22025-86%1977
Lesser GoldfinchFringillidae22023+50%1979
Green-tailed TowheePasserellidae22013-38%1982
Cliff SwallowHirundinidae22025-83%1977
Violet-green SwallowHirundinidae22025-33%1984
Warbling VireoVireonidae22025-46%1977

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