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BBS Route · California · BCR 15

Chester Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 45 species recorded across 6 survey years, still active.

45Species 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 →
1997–2017Span
2Observers

Bird Species Found on California Chester

Top 40 of 45 species by most recent count. Each links to its species trend.

Species recorded on the Chester 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 RobinTurdidae412017+19%2012
Mountain ChickadeeParidae292017-40%2012
Golden-crowned KingletRegulidae262017+31%2012
Chipping SparrowPasserellidae252017-6%2012
Red-breasted NuthatchSittidae222017-26%2012
Fox SparrowPasserellidae132017+0%2012
Western Wood-PeweeTyrannidae112017-23%2012
Cassin's VireoVireonidae112017+63%1999
Wilson's WarblerParulidae102017+140%2012
Hairy WoodpeckerPicidae82016+60%1997
Hermit WarblerParulidae72017-36%1999
Pileated WoodpeckerPicidae62017+71%2012
Steller's JayCorvidae62017+0%2012
Pine SiskinFringillidae52017+229%2012
Black-headed GrosbeakCardinalidae52017+225%2012
MacGillivray's WarblerParulidae52017-55%2012
Hermit ThrushTurdidae52017-63%2012
Hammond's FlycatcherTyrannidae42016-65%1999
Cassin's FinchFringillidae42017-47%2012
Yellow WarblerParulidae42016-38%1999
Townsend's SolitaireTurdidae42013+33%1997
Olive-sided FlycatcherTyrannidae32017-11%1999
Dusky FlycatcherTyrannidae32017-47%2012
Western TanagerCardinalidae32017-69%2012
Bewick's WrenTroglodytidae32017+67%2012
Brown CreeperCerthiidae32017-86%1997
Sandhill CraneGruidae21997n/an/a
Wilson's SnipeScolopacidae22012-33%1997
White-headed WoodpeckerPicidae22017-20%1999
Common NighthawkCaprimulgidae22017+0%1999
Bullock's OrioleIcteridae22013+100%1997
Green-tailed TowheePasserellidae22017+133%1999
OspreyPandionidae22016n/an/a
White-crowned SparrowPasserellidae22017n/an/a
Mountain QuailOdontophoridae12016+0%1997
Mourning DoveColumbidae12017-50%1997
Red-breasted SapsuckerPicidae12017-57%1999
Brown-headed CowbirdIcteridae12016+0%1997
Evening GrosbeakFringillidae12016-95%1997
Spotted TowheePasserellidae12016+50%2012

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