BirdAnalyst
BBS Route · Iowa · BCR 22

Rock Valley Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 101 species recorded across 40 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 →
40Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2025Span
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 SparrowPasseridae1702025+36%1970
Red-winged BlackbirdIcteridae972025+69%1970
American RobinTurdidae862025+94%1970
Brown-headed CowbirdIcteridae542025+23%1970
Common GrackleIcteridae492025+67%1970
Mourning DoveColumbidae442025-17%1970
DickcisselCardinalidae422025-55%1970
European StarlingSturnidae292025-50%1970
Rock PigeonColumbidae252025-63%1970
KilldeerCharadriidae242025+243%1970
Barn SwallowHirundinidae242025-45%1970
Ring-necked PheasantPhasianidae212025-37%1970
Eurasian Collared-DoveColumbidae132025+32%2017
Chipping SparrowPasserellidae122025+660%1971
Song SparrowPasserellidae92025-41%1970
Common YellowthroatParulidae82025-39%1970
Cliff SwallowHirundinidae82025+767%1997
Sedge WrenTroglodytidae82019+325%1993
Eastern KingbirdTyrannidae72025-55%1970
Western MeadowlarkIcteridae72019-93%1970
Vesper SparrowPasserellidae72025-6%1970
Red-headed WoodpeckerPicidae62025-44%1970
Northern House WrenTroglodytidae62025-18%1970
Chimney SwiftApodidae52025-69%1970
Orchard OrioleIcteridae52019+300%2015
Bank SwallowHirundinidae52016+29%1977
Upland SandpiperScolopacidae52025+433%1991
Eastern MeadowlarkIcteridae52024+200%2016
Cedar WaxwingBombycillidae51997-38%1993
Blue JayCorvidae42025-61%1970
American GoldfinchFringillidae42025+20%1971
Lark BuntingPasserellidae41970+100%1968
Loggerhead ShrikeLaniidae41982n/an/a
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 FinchFringillidae32025+82%1995

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