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BBS Route · California · BCR 33

Imperial Dam Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 92 species recorded across 20 survey years, no longer active.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 →
20Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1973–2010Span
5Observers

Bird Species Found on California Imperial Dam

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

Species recorded on the Imperial Dam 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-winged BlackbirdIcteridae3632010+374%1977
Cliff SwallowHirundinidae2622010-23%1977
Great-tailed GrackleIcteridae137201051×1977
Mourning DoveColumbidae962010-22%1977
White-winged DoveColumbidae882010+273%1977
European StarlingSturnidae812010-36%1977
House SparrowPasseridae512010+84%1977
Eurasian Collared-DoveColumbidae442010+159%2006
Rock PigeonColumbidae332010-18%1977
Gambel's QuailOdontophoridae282010-28%1977
Western KingbirdTyrannidae252010+78%1977
Common NighthawkCaprimulgidae22199122×1987
Brewer's BlackbirdIcteridae201973n/an/a
VerdinRemizidae202010+91%1977
Violet-green SwallowHirundinidae161986+700%1978
Northern MockingbirdMimidae142010-56%1977
Lesser NighthawkCaprimulgidae132010+6%1977
Cinnamon TealAnatidae131978n/an/a
Common YellowthroatParulidae122010+14%1977
KilldeerCharadriidae112010+213%1978
Gila WoodpeckerPicidae102010+200%1977
Ash-throated FlycatcherTyrannidae102010+6%1977
Northern Rough-winged SwallowHirundinidae92010-47%1977
House FinchFringillidae82010-65%1977
Cassin's KingbirdTyrannidae82006+700%1976
Brown-headed CowbirdIcteridae72010+162%1977
Common Ground DoveColumbidae62010-44%1983
Spotted SandpiperScolopacidae51973n/an/a
American KestrelFalconidae52010+29%1977
Yellow-breasted ChatIcteriidae52010+100%1983
Virginia RailRallidae52010+200%1989
Marsh WrenTroglodytidae52010-23%1980
SoraRallidae51984+25%1983
Black PhoebeTyrannidae42010+100%1977
Song SparrowPasserellidae42006+164%1984
Black-necked StiltRecurvirostridae41987+67%1984
Yellow-headed BlackbirdIcteridae32010+66%1977
Abert's TowheePasserellidae32006+113%1979
Great Horned OwlStrigidae31988+17%1979
Western Cattle-EgretArdeidae32010-96%1986

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