BirdAnalyst
BBS Route · Maryland · BCR 29

Bachman Mill Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 104 species recorded across 59 survey years, still active.

104Species 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 →
59Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2025Span
8Observers

Bird Species Found on Maryland Bachman Mill

Top 40 of 104 species by most recent count. Each links to its species trend.

Species recorded on the Bachman Mill 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
American RobinTurdidae732025+210%1968
Red-winged BlackbirdIcteridae632025-31%1968
Gray CatbirdMimidae552025+163%1968
Mourning DoveColumbidae542025+140%1968
Northern CardinalCardinalidae492025+537%1968
Barn SwallowHirundinidae392025-13%1968
European StarlingSturnidae382025-13%1968
House SparrowPasseridae362025-66%1968
Northern MockingbirdMimidae292025+63%1968
American CrowCorvidae282025-12%1968
Song SparrowPasserellidae272025+48%1968
Red-bellied WoodpeckerPicidae25202513×1968
House FinchFringillidae242025+13%1986
Common GrackleIcteridae182025-85%1968
Chipping SparrowPasserellidae172025+83%1968
Canada GooseAnatidae172023-36%1992
Red-eyed VireoVireonidae162025+119%1968
Wood ThrushTurdidae142025-12%1968
Blue JayCorvidae122025-29%1968
Indigo BuntingCardinalidae102025-10%1968
Northern House WrenTroglodytidae102025-39%1968
Tufted TitmouseParidae102025+211%1969
Northern Rough-winged SwallowHirundinidae92024+186%1979
Rock PigeonColumbidae82025-20%1968
VeeryTurdidae72025+180%1971
Field SparrowPasserellidae62025-61%1968
Carolina WrenTroglodytidae6202511×1972
Eastern Wood-PeweeTyrannidae52025+30%1968
Common YellowthroatParulidae52025-37%1968
Great Crested FlycatcherTyrannidae52025-23%1969
Eastern BluebirdTurdidae52025+225%1970
Cedar WaxwingBombycillidae52024+60%1988
OvenbirdParulidae42025+114%1969
Acadian FlycatcherTyrannidae42025+160%1976
Fish CrowCorvidae32009+75%1982
Brown-headed CowbirdIcteridae32025-55%1968
American GoldfinchFringillidae32025-47%1968
Turkey VultureCathartidae32025-50%1969
Baltimore OrioleIcteridae32025+80%1971
Willow FlycatcherTyrannidae32025-44%1982

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