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BBS Route · California · BCR 32

Waterman Gap Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 92 species recorded across 46 survey years, still active.

92Species 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 →
46Years 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
4Observers

Bird Species Found on California Waterman Gap

Top 40 of 92 species by most recent count. Each links to its species trend.

Species recorded on the Waterman Gap 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
Acorn WoodpeckerPicidae902025+673%1975
Spotted TowheePasserellidae532025+203%1975
Warbling VireoVireonidae372025+37%1975
Black-throated Gray WarblerParulidae282025+348%1975
Steller's JayCorvidae272025+42%1975
Bewick's WrenTroglodytidae272025+200%1976
Band-tailed PigeonColumbidae232025+293%1975
Olive-sided FlycatcherTyrannidae232025+111%1975
Chestnut-backed ChickadeeParidae212025-47%1975
American RobinTurdidae202025+20%1975
Common RavenCorvidae182025+567%1988
Wilson's WarblerParulidae182025+350%1977
Purple FinchFringillidae152025+10%1977
California QuailOdontophoridae142025+173%1975
Hermit ThrushTurdidae142025+10%1977
California TowheePasserellidae132025+150%1975
Brown CreeperCerthiidae132025+40%1975
Pacific WrenTroglodytidae122025+480%1976
Lesser GoldfinchFringillidae122025+80%1978
Anna's HummingbirdTrochilidae92025+460%1978
Orange-crowned WarblerParulidae82025-28%1977
Brewer's BlackbirdIcteridae72025-44%1975
Western TanagerCardinalidae72025-7%1976
WrentitSylviidae72025-54%1975
American CrowCorvidae62025+440%2007
Black-headed GrosbeakCardinalidae62025-19%1975
Lazuli BuntingCardinalidae62025+433%2006
Pygmy NuthatchSittidae62025-43%1978
Mourning DoveColumbidae52025+11%1975
California Scrub-JayCorvidae52025-27%1975
Oak TitmouseParidae52025-64%1977
House FinchFringillidae42025-79%1975
White-crowned SparrowPasserellidae41972n/an/a
Cassin's VireoVireonidae42025-52%1975
Hutton's VireoVireonidae42024-50%1975
Purple MartinHirundinidae42024+300%2017
Hairy WoodpeckerPicidae32024+25%1975
Western Wood-PeweeTyrannidae32025-55%1975
Allen's HummingbirdTrochilidae32025+50%1977
Red-winged BlackbirdIcteridae32016+50%1980

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