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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 34 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 →
34Years 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
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 SwallowHirundinidae1132025+364%1974
Brewer's BlackbirdIcteridae762025+96%1974
Sage ThrasherMimidae582025+73%1974
Brewer's SparrowPasserellidae542025+18%1974
Savannah SparrowPasserellidae382025+740%1974
Pinyon JayCorvidae372004+525%1980
Green-tailed TowheePasserellidae362025+303%1974
Red-winged BlackbirdIcteridae342025-40%1974
American CrowCorvidae21198621×1975
Common RavenCorvidae172025+643%1974
Brown-headed CowbirdIcteridae172025+133%1975
Vesper SparrowPasserellidae172025+150%1975
Western MeadowlarkIcteridae162025+93%1974
Gray FlycatcherTyrannidae16202514×1982
Horned LarkAlaudidae132025+44%1974
Mourning DoveColumbidae122025+58%1974
Purple FinchFringillidae91977+350%1975
Greater Sage-GrousePhasianidae72025-63%1987
Fox SparrowPasserellidae72017+167%2013
Turkey VultureCathartidae62025+100%1986
Northern Rough-winged SwallowHirundinidae62021-64%2002
House FinchFringillidae52025+57%2012
Yellow-headed BlackbirdIcteridae42025-41%1974
Northern PintailAnatidae32014-67%1974
KilldeerCharadriidae32025-89%1974
Bewick's WrenTroglodytidae32015+200%1973
Western TanagerCardinalidae32025+14%1982
Black-billed MagpieCorvidae32022+67%1994
Black TernLaridae31982n/an/a
Cinnamon TealAnatidae22024-76%1974
Snowy EgretArdeidae22019+10%1988
Cassin's FinchFringillidae22025+43%1975
Grasshopper SparrowPasserellidae21977+11%1974
Western Wood-PeweeTyrannidae22025+29%1978
American AvocetRecurvirostridae22025-18%1977
Lewis's WoodpeckerPicidae22025+0%1983
Violet-green SwallowHirundinidae22012+29%1979
American PipitMotacillidae21974n/an/a
Rock WrenTroglodytidae22025+17%1979
Mountain ChickadeeParidae22024-18%1976

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