BirdAnalyst
BBS Route · Utah · BCR 16

Boulder Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 112 species recorded across 39 survey years, still active.

112Species 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 →
1968–2021Span
7Observers

Bird Species Found on Utah Boulder

Top 40 of 112 species by most recent count. Each links to its species trend.

Species recorded on the Boulder 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
Violet-green SwallowHirundinidae342021-10%1986
Cliff SwallowHirundinidae262021+4%1971
White-throated SwiftApodidae102018-4%1987
House FinchFringillidae102019+21%1987
Pinyon JayCorvidae92021-56%1971
Ash-throated FlycatcherTyrannidae92021-30%1987
Tree SwallowHirundinidae72002+210%1994
Plumbeous VireoVireonidae62019-28%1988
Brewer's BlackbirdIcteridae52021-87%1974
Black-billed MagpieCorvidae42019+33%1974
Western Wood-PeweeTyrannidae42018+29%1989
Blue-gray GnatcatcherPolioptilidae42019-52%1990
Sagebrush SparrowPasserellidae42003-25%1993
Rock PigeonColumbidae41993n/an/a
Western MeadowlarkIcteridae32021+25%1971
American RobinTurdidae32021+33%1971
Turkey VultureCathartidae32021+100%1989
Common RavenCorvidae32021+52%1986
Cinnamon TealAnatidae32011+200%1971
House SparrowPasseridae32019-54%2004
Rock WrenTroglodytidae32019-58%1987
Spotted TowheePasserellidae32021-50%1989
Northern Rough-winged SwallowHirundinidae32012-25%1990
Bewick's WrenTroglodytidae32018-36%2006
Pine SiskinFringillidae32019+200%1989
Gambel's QuailOdontophoridae31990n/an/a
Western BluebirdTurdidae32019+29%1995
Common GrackleIcteridae32014+50%2004
Mourning DoveColumbidae22021+14%1971
Song SparrowPasserellidae22004-33%1986
Mountain BluebirdTurdidae22019+120%1986
Red-winged BlackbirdIcteridae22021-52%1974
Lark SparrowPasserellidae22019-10%1988
Gray VireoVireonidae22018+43%1993
Yellow WarblerParulidae22021+50%1989
Black-throated Gray WarblerParulidae22021-67%1987
Woodhouse's Scrub-JayCorvidae22021-85%1988
Townsend's SolitaireTurdidae22008-33%1987
American CootRallidae22021-17%1992
Dusky FlycatcherTyrannidae22019-33%1990

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