BirdAnalyst
BBS Route · Iowa · BCR 22

Williamsburg Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 98 species recorded across 47 survey years, still active.

98Species 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 →
47Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1967–2023Span
11Observers

Bird Species Found on Iowa Williamsburg

Top 40 of 98 species by most recent count. Each links to its species trend.

Species recorded on the Williamsburg 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 BlackbirdIcteridae3202023+115%1969
DickcisselCardinalidae1172023+29%1969
Canada GooseAnatidae722022+195%1992
Barn SwallowHirundinidae432023+55%1969
American RobinTurdidae352023+139%1969
House SparrowPasseridae332023-68%1969
Mourning DoveColumbidae322023+36%1969
Ring-necked PheasantPhasianidae262023-30%1969
Common YellowthroatParulidae202023-9%1969
Eastern MeadowlarkIcteridae162023+70%1969
American CrowCorvidae152023-22%1969
Song SparrowPasserellidae142023+86%1969
KilldeerCharadriidae12202318×1969
Common GrackleIcteridae122023-56%1969
Brown-headed CowbirdIcteridae92023+29%1969
European StarlingSturnidae82023-59%1969
Northern CardinalCardinalidae72023+92%1969
American GoldfinchFringillidae62023-68%1969
Field SparrowPasserellidae62023+73%1969
Upland SandpiperScolopacidae52008-58%1970
MallardAnatidae52016+0%1993
Turkey VultureCathartidae52023+111%1997
Eastern KingbirdTyrannidae42023-53%1970
Blue JayCorvidae42023-65%1970
Indigo BuntingCardinalidae42023+100%1969
Northern House WrenTroglodytidae42023-56%1969
Rock PigeonColumbidae42023-86%1971
Chipping SparrowPasserellidae42023+450%1977
Henslow's SparrowPasserellidae42008+100%2004
Eurasian Tree SparrowPasseridae42023+100%2021
Red-headed WoodpeckerPicidae32023-68%1969
Horned LarkAlaudidae32022-83%1969
Eastern BluebirdTurdidae32010+20%1970
Northern Rough-winged SwallowHirundinidae32022+67%1979
Cliff SwallowHirundinidae32023+780%1985
Eurasian Collared-DoveColumbidae32023+17%2016
Northern BobwhiteOdontophoridae22023-82%1969
Red-tailed HawkAccipitridae22023+33%1972
Chimney SwiftApodidae22019-33%1970
Purple MartinHirundinidae21993-40%1969

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