BirdAnalyst
BBS Route · California · BCR 9

Iron Gate Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 136 species recorded across 30 survey years, still active.

136Species 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 →
1988–2019Span
1Observers

Bird Species Found on California Iron Gate

Top 40 of 136 species by most recent count. Each links to its species trend.

Species recorded on the Iron Gate 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
Cliff SwallowHirundinidae3812019+120%1991
Western GrebePodicipedidae1242019+127%1991
Red-winged BlackbirdIcteridae1142019+16%1991
American White PelicanPelecanidae1132019+61%1991
Canada GooseAnatidae1072019+171%1991
California GullLaridae932019+63%1991
Caspian TernLaridae792019+20%1991
Brewer's BlackbirdIcteridae662019+37%1991
American CrowCorvidae652019+61%1991
Western MeadowlarkIcteridae572019+75%1991
Lesser GoldfinchFringillidae512019+117%1991
Turkey VultureCathartidae492019+185%1991
Tricolored BlackbirdIcteridae452011+165%1991
Bewick's WrenTroglodytidae442019+113%1991
Western KingbirdTyrannidae422019+17%1991
Bullock's OrioleIcteridae422019-13%1991
Acorn WoodpeckerPicidae412019+53%1991
Mourning DoveColumbidae392019+16%1991
Northern House WrenTroglodytidae332019+64%1991
Ash-throated FlycatcherTyrannidae312019+6%1991
House FinchFringillidae312019-52%1991
California Scrub-JayCorvidae302019+43%1991
Eurasian Collared-DoveColumbidae302019+237%2012
Brown-headed CowbirdIcteridae282019-39%1991
Double-crested CormorantPhalacrocoracidae272019-88%1991
OspreyPandionidae262019+178%1991
Oak TitmouseParidae252019+265%1991
Common MerganserAnatidae242019+100%1991
Great Blue HeronArdeidae242019-1%1991
California QuailOdontophoridae242019+25%1991
Cedar WaxwingBombycillidae242010+100%1999
Black-headed GrosbeakCardinalidae232019-39%1991
MallardAnatidae222019-22%1991
Western Wood-PeweeTyrannidae222019-21%1991
Yellow WarblerParulidae182019-21%1991
American RobinTurdidae172019+11%1991
European StarlingSturnidae152019-48%1991
California TowheePasserellidae142019-16%1991
KilldeerCharadriidae132019-31%1991
Song SparrowPasserellidae132019-33%1991

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