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BBS Route · Montana · BCR 10

Twin Bridges Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 64 species recorded across 9 survey years, no longer active.

64Species 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 →
9Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–1976Span
1Observers

Bird Species Found on Montana Twin Bridges

Top 40 of 64 species by most recent count. Each links to its species trend.

Species recorded on the Twin Bridges 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
Brewer's BlackbirdIcteridae1021976-11%1970
European StarlingSturnidae411976+224%1970
Bank SwallowHirundinidae391976-67%1970
Vesper SparrowPasserellidae331976-14%1970
Western MeadowlarkIcteridae301976-13%1970
Savannah SparrowPasserellidae241976-11%1970
Mourning DoveColumbidae211976-2%1970
House SparrowPasseridae191976-9%1970
Black-billed MagpieCorvidae181976-60%1970
Rock PigeonColumbidae161976+267%1970
Horned LarkAlaudidae161976-50%1970
Red-winged BlackbirdIcteridae161976-9%1970
American CrowCorvidae131976-27%1970
Yellow-headed BlackbirdIcteridae131976+105%1970
American RobinTurdidae111976-29%1970
Song SparrowPasserellidae91976-32%1970
Brown-headed CowbirdIcteridae81976+14%1970
American GoldfinchFringillidae81974+63%1970
Barn SwallowHirundinidae81976+100%1970
Common YellowthroatParulidae81976-36%1970
Wilson's SnipeScolopacidae71976+6%1970
Sandhill CraneGruidae61976+71%1970
Sage ThrasherMimidae61976+155%1970
KilldeerCharadriidae41976+39%1970
Thick-billed LongspurCalcariidae41976-43%1970
Yellow WarblerParulidae41976-21%1970
Northern House WrenTroglodytidae41976-40%1970
Willow FlycatcherTyrannidae31976-30%1970
VeeryTurdidae31976+20%1970
Ring-necked PheasantPhasianidae21976-19%1970
Common RavenCorvidae21974+100%1968
Cliff SwallowHirundinidae21976-58%1970
Northern Rough-winged SwallowHirundinidae21976-33%1970
Gray CatbirdMimidae21976+20%1970
Mountain BluebirdTurdidae21972-20%1969
Warbling VireoVireonidae21976+0%1971
Yellow-breasted ChatIcteriidae21971n/an/a
Long-billed CurlewScolopacidae21974+100%1972
MallardAnatidae11976+0%1971
Blue-winged TealAnatidae11968n/an/a

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