BirdAnalyst
BBS Route · Colorado · BCR 18

Arsenal Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 85 species recorded across 25 survey years, no longer active.

85Species 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 →
25Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1991–2015Span
4Observers

Bird Species Found on Colorado Arsenal

Top 40 of 85 species by most recent count. Each links to its species trend.

Species recorded on the Arsenal 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
Western MeadowlarkIcteridae1162015-69%1993
Mourning DoveColumbidae532015-24%1993
European StarlingSturnidae442015-29%1993
Western KingbirdTyrannidae432015-18%1993
Cliff SwallowHirundinidae402015+93%1998
American RobinTurdidae352015+75%1993
Horned LarkAlaudidae302015+35%1993
Red-winged BlackbirdIcteridae232015-52%1993
Black-billed MagpieCorvidae192015-62%1993
Northern House WrenTroglodytidae192015+47%1993
Common GrackleIcteridae182015+2%1994
Lark BuntingPasserellidae182015-82%1993
Bullock's OrioleIcteridae162015-48%1993
Red-tailed HawkAccipitridae122015+200%1993
Vesper SparrowPasserellidae122015+91%1997
Bank SwallowHirundinidae102015+67%2008
Double-crested CormorantPhalacrocoracidae72015-56%1993
Rock PigeonColumbidae72015-88%1993
Ring-billed GullLaridae71992n/an/a
American White PelicanPelecanidae72014-31%1994
Swainson's HawkAccipitridae62015+17%1993
KilldeerCharadriidae52015-62%1993
Marsh WrenTroglodytidae52002+400%1991
MallardAnatidae42015+50%1994
Burrowing OwlStrigidae42015+50%1993
Lark SparrowPasserellidae42015+150%1998
House SparrowPasseridae42015-82%1993
Northern MockingbirdMimidae42015-22%1998
Pied-billed GrebePodicipedidae31999+200%1991
Blue-winged TealAnatidae31998-20%1993
Canada GooseAnatidae32015-85%1994
Northern BobwhiteOdontophoridae31991n/an/a
American GoldfinchFringillidae32015-69%1994
Cassin's SparrowPasserellidae32014+275%1993
Song SparrowPasserellidae32015-20%1994
Tree SwallowHirundinidae32015+100%2000
Snowy EgretArdeidae32014+50%2009
Brown-headed CowbirdIcteridae22015-22%1994
Black-headed GrosbeakCardinalidae22012+0%1995
Yellow WarblerParulidae22015-68%1993

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