BirdAnalyst
BBS Route · California · BCR 33

Eureka Val Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 37 species recorded across 30 survey years, still active.

37Species 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 →
30Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1973–2025Span
3Observers

Bird Species Found on California Eureka Val

Top 37 of 37 species by most recent count. Each links to its species trend.

Species recorded on the Eureka Val 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
House FinchFringillidae172024-74%1976
Black-throated SparrowPasserellidae92025-59%1976
Brewer's SparrowPasserellidae72016+100%1977
Say's PhoebeTyrannidae42025-63%1976
Horned LarkAlaudidae42024+243%1976
ChukarPhasianidae42024-27%1977
Northern MockingbirdMimidae32024+73%1978
Red-winged BlackbirdIcteridae31978n/an/a
Brown-headed CowbirdIcteridae32024-36%1995
Costa's HummingbirdTrochilidae32024+57%1995
Bullock's OrioleIcteridae32025+0%2015
Mourning DoveColumbidae22025-54%1976
Loggerhead ShrikeLaniidae22024+33%1976
Common PoorwillCaprimulgidae21995+100%1990
Lesser NighthawkCaprimulgidae22024+100%1992
Burrowing OwlStrigidae21993n/an/a
American KestrelFalconidae21995n/an/a
Yellow WarblerParulidae22004+0%2002
Chipping SparrowPasserellidae22015n/an/a
Prairie FalconFalconidae12005+0%1996
Ash-throated FlycatcherTyrannidae12025-40%1976
Common RavenCorvidae12025-20%1976
Pinyon JayCorvidae12005-20%1991
Rock WrenTroglodytidae12025-13%1976
White-throated SwiftApodidae11993-50%1975
Red-tailed HawkAccipitridae12024+33%1996
Great Horned OwlStrigidae12017+0%1976
Blue-gray GnatcatcherPolioptilidae12024-56%1990
LeConte's ThrasherMimidae12019-50%1993
Golden EagleAccipitridae12014+0%1993
Green-tailed TowheePasserellidae11995n/an/a
Barn SwallowHirundinidae11997n/an/a
Violet-green SwallowHirundinidae12004-25%2000
California GullLaridae12014n/an/a
Eurasian Collared-DoveColumbidae12021+0%2015
Northern HarrierAccipitridae12016n/an/a
Western KingbirdTyrannidae12017n/an/a

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