BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Bow Bridge Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 122 species recorded across 53 survey years, still active.

122Species 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 →
53Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1969–2025Span
3Observers

Bird Species Found on Pennsylvania Bow Bridge

Top 40 of 122 species by most recent count. Each links to its species trend.

Species recorded on the Bow Bridge 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 BlackbirdIcteridae532025-88%1971
American RobinTurdidae412025-56%1971
American GoldfinchFringillidae262025-73%1971
European StarlingSturnidae252025-92%1971
Song SparrowPasserellidae222025-68%1971
Mourning DoveColumbidae202025+148%1971
Common YellowthroatParulidae182025-58%1971
Gray CatbirdMimidae182025-16%1971
Barn SwallowHirundinidae172025-77%1971
Yellow WarblerParulidae162025+12%1971
American CrowCorvidae152025-64%1971
Cedar WaxwingBombycillidae152025+9%1971
Indigo BuntingCardinalidae92025-80%1971
Chipping SparrowPasserellidae82025-75%1971
OvenbirdParulidae82025+118%1971
Black-capped ChickadeeParidae82025+15%1971
MallardAnatidae82021+267%1983
Baltimore OrioleIcteridae72025-30%1971
Northern CardinalCardinalidae72025-16%1971
House SparrowPasseridae72025-92%1971
Common RavenCorvidae72025+220%2009
Rock PigeonColumbidae62025+38%1971
Tree SwallowHirundinidae62025+17%1972
Red-eyed VireoVireonidae62025-41%1971
American RedstartParulidae62025-59%1971
Red-bellied WoodpeckerPicidae62025+120%2002
Chimney SwiftApodidae52025-58%1971
Eastern PhoebeTyrannidae52025-68%1971
BobolinkIcteridae52025-40%1971
Eastern MeadowlarkIcteridae52025-92%1971
Field SparrowPasserellidae52025-82%1971
VeeryTurdidae52025-75%1971
Tufted TitmouseParidae52025+17%1975
Eastern KingbirdTyrannidae42024-39%1971
Northern House WrenTroglodytidae42025-66%1971
Wood ThrushTurdidae42025-87%1971
Carolina WrenTroglodytidae42025+200%1999
Turkey VultureCathartidae42024+20%1987
Eastern TowheePasserellidae32025-81%1971
Rose-breasted GrosbeakCardinalidae32025-75%1971

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