BirdAnalyst
BBS Route · California · BCR 32

Riovista Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 83 species recorded across 43 survey years, still active.

83Species 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 →
43Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2024Span
9Observers

Bird Species Found on California Riovista

Top 40 of 83 species by most recent count. Each links to its species trend.

Species recorded on the Riovista 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
Tricolored BlackbirdIcteridae3262024-26%2012
European StarlingSturnidae942024+85%1970
Western MeadowlarkIcteridae862024-65%1970
Brewer's BlackbirdIcteridae762024-52%1970
Violet-green SwallowHirundinidae57202223×2001
House FinchFringillidae282024-67%1970
Northern MockingbirdMimidae262024+128%1970
Mourning DoveColumbidae202024-27%1970
Snowy EgretArdeidae192007+214%1999
Canada GooseAnatidae192023+44%2005
American White PelicanPelecanidae162015-48%1996
Western KingbirdTyrannidae122024+10%1970
American CrowCorvidae122024-51%1970
Barn SwallowHirundinidae122024-43%1970
Loggerhead ShrikeLaniidae112024-76%1970
Rock PigeonColumbidae112024-3%1975
Eurasian Collared-DoveColumbidae112024-21%2015
American KestrelFalconidae92024-75%1970
Turkey VultureCathartidae92024+73%1974
White-throated SwiftApodidae82019+350%2008
Red-tailed HawkAccipitridae72024-14%1971
Northern HarrierAccipitridae62024+0%1970
KilldeerCharadriidae52023-13%1970
California Scrub-JayCorvidae52024+75%1971
Long-billed CurlewScolopacidae51971n/an/a
Black-necked StiltRecurvirostridae51972n/an/a
Lesser GoldfinchFringillidae52013+125%1994
Savannah SparrowPasserellidae52023+100%2011
House SparrowPasseridae42024-91%1970
Horned LarkAlaudidae32024-19%1970
Brown-headed CowbirdIcteridae32023+269%1982
Cliff SwallowHirundinidae32023-78%1970
American WigeonAnatidae31976n/an/a
American RobinTurdidae32024+225%2008
Grasshopper SparrowPasserellidae32014n/an/a
Ring-billed GullLaridae32017n/an/a
Burrowing OwlStrigidae22018-86%1970
Red-winged BlackbirdIcteridae22024-66%1970
MallardAnatidae22014-70%1993
Tree SwallowHirundinidae22023+217%1972

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