BirdAnalyst
BBS Route · Iowa · BCR 22

Rock Valley Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 101 species recorded across 39 survey years, still active.

101Species 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 →
39Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2024Span
5Observers

Bird Species Found on Iowa Rock Valley

Top 40 of 101 species by most recent count. Each links to its species trend.

Species recorded on the Rock Valley 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
House SparrowPasseridae1922024+52%1970
Red-winged BlackbirdIcteridae1442024+114%1970
Common GrackleIcteridae872024+101%1970
American RobinTurdidae652024+148%1970
Brown-headed CowbirdIcteridae492024+54%1970
Mourning DoveColumbidae472024+1%1970
Ring-necked PheasantPhasianidae302024-35%1970
DickcisselCardinalidae262024-57%1970
Barn SwallowHirundinidae242024-40%1970
European StarlingSturnidae232024-17%1970
KilldeerCharadriidae202024+257%1970
Rock PigeonColumbidae152024-82%1970
Cliff SwallowHirundinidae15202420×1997
Eurasian Collared-DoveColumbidae152024+43%2017
Northern House WrenTroglodytidae122024-16%1970
Chipping SparrowPasserellidae102024+920%1971
Common YellowthroatParulidae102024-2%1970
Sedge WrenTroglodytidae82019+325%1993
Western MeadowlarkIcteridae72019-93%1970
Warbling VireoVireonidae72019+467%1973
Eastern KingbirdTyrannidae52019-64%1970
Song SparrowPasserellidae52024-26%1970
Orchard OrioleIcteridae52019+300%2015
Bank SwallowHirundinidae52016+29%1977
Eastern MeadowlarkIcteridae52024+200%2016
Cedar WaxwingBombycillidae51997-38%1993
Chimney SwiftApodidae42024-74%1970
Lark BuntingPasserellidae41970+100%1968
Loggerhead ShrikeLaniidae41982n/an/a
Red-headed WoodpeckerPicidae32024-47%1970
Horned LarkAlaudidae32024-27%1970
Indigo BuntingCardinalidae32019+233%1971
Brown ThrasherMimidae32019-75%1970
Black-capped ChickadeeParidae32015+50%1972
Blue-winged TealAnatidae31988-33%1976
Black TernLaridae31972n/an/a
House FinchFringillidae32019+136%1995
Gray PartridgePhasianidae22001+14%1972
American CrowCorvidae22024-78%1970
Vesper SparrowPasserellidae22024+13%1970

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