BirdAnalyst
BBS Route · California · BCR 15

Riverton Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 111 species recorded across 50 survey years, still active.

111Species 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 →
50Years 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 Riverton

Top 40 of 111 species by most recent count. Each links to its species trend.

Species recorded on the Riverton 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
Red-breasted NuthatchSittidae422025+76%1975
Hermit WarblerParulidae342025+252%1976
Western TanagerCardinalidae242025-31%1975
Golden-crowned KingletRegulidae242025-7%1977
Fox SparrowPasserellidae182025-3%1975
Mountain ChickadeeParidae182025+3%1975
American RobinTurdidae172025-63%1975
Mountain QuailOdontophoridae162025-51%1975
Warbling VireoVireonidae152025+65%1975
Western Wood-PeweeTyrannidae142025-49%1975
Steller's JayCorvidae142025-28%1975
Spotted TowheePasserellidae142025+14%1975
Nashville WarblerParulidae142025+33%1975
Black-throated Gray WarblerParulidae142025+83%1976
MacGillivray's WarblerParulidae142025+72%1975
Chipping SparrowPasserellidae122025-64%1975
Cassin's VireoVireonidae122025+64%1999
Olive-sided FlycatcherTyrannidae102025-58%1975
Purple FinchFringillidae102025+65%1975
Plumbeous VireoVireonidae101996+67%1975
Yellow WarblerParulidae102025-64%1975
White-headed WoodpeckerPicidae92025+15%1975
Hammond's FlycatcherTyrannidae92025+317%1975
Brown CreeperCerthiidae92025-41%1975
Common RavenCorvidae72022+46%1993
WrentitSylviidae62018+200%1978
Lazuli BuntingCardinalidae52025-56%1975
Black-headed GrosbeakCardinalidae42025-53%1975
Hermit ThrushTurdidae42025-84%1975
Cassin's FinchFringillidae42025-47%1977
Common MerganserAnatidae42017+300%1980
Hairy WoodpeckerPicidae32025+225%1975
Brown-headed CowbirdIcteridae32025+50%1975
Green-tailed TowheePasserellidae32025-70%1975
Western KingbirdTyrannidae32002+300%1997
Dusky FlycatcherTyrannidae32025-47%1976
Lesser GoldfinchFringillidae32025-40%1976
Bewick's WrenTroglodytidae32022+0%1977
Pileated WoodpeckerPicidae32025+80%1977
Evening GrosbeakFringillidae32016-73%1978

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