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BBS Route · California · BCR 9

Crowley Lake Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 123 species recorded across 33 survey years, still active.

123Species 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 →
33Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1972–2024Span
7Observers

Bird Species Found on California Crowley Lake

Top 40 of 123 species by most recent count. Each links to its species trend.

Species recorded on the Crowley Lake 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
Cliff SwallowHirundinidae1962024+424%1974
Brewer's BlackbirdIcteridae972024+118%1974
Sage ThrasherMimidae762024+72%1974
Brewer's SparrowPasserellidae662024+34%1974
California GullLaridae452024-66%1974
Green-tailed TowheePasserellidae392024+314%1974
Pinyon JayCorvidae372004+525%1980
Horned LarkAlaudidae342024+53%1974
Red-winged BlackbirdIcteridae342024-39%1974
Western MeadowlarkIcteridae332024+159%1974
Savannah SparrowPasserellidae252024+560%1974
American CrowCorvidae21198621×1975
Gray FlycatcherTyrannidae21202414×1982
MallardAnatidae182022+363%1975
Common NighthawkCaprimulgidae122024-37%1975
Vesper SparrowPasserellidae122024+113%1975
Common RavenCorvidae112024+614%1974
Brown-headed CowbirdIcteridae92024+33%1975
Purple FinchFringillidae91977+350%1975
Fox SparrowPasserellidae72017+167%2013
Northern Rough-winged SwallowHirundinidae62021-64%2002
GadwallAnatidae52024+87%1983
Yellow-headed BlackbirdIcteridae42024-38%1974
Western Wood-PeweeTyrannidae42024+57%1978
American AvocetRecurvirostridae42014-27%1977
Rock WrenTroglodytidae42024+0%1979
House FinchFringillidae42022+0%2012
Northern PintailAnatidae32014-67%1974
Bewick's WrenTroglodytidae32015+200%1973
Turkey VultureCathartidae32024+20%1986
Western TanagerCardinalidae32024+14%1982
Black-billed MagpieCorvidae32022+67%1994
Black TernLaridae31982n/an/a
Cinnamon TealAnatidae22024-76%1974
Snowy EgretArdeidae22019+10%1988
Wilson's SnipeScolopacidae22024-68%1974
KilldeerCharadriidae22024-92%1974
Mourning DoveColumbidae22024-8%1974
Cassin's FinchFringillidae22021+114%1975
Grasshopper SparrowPasserellidae21977+11%1974

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