BirdAnalyst
BBS Route · Colorado · BCR 16

Basin Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 93 species recorded across 30 survey years, still active.

93Species 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 →
30Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1995–2025Span
4Observers

Bird Species Found on Colorado Basin

Top 40 of 93 species by most recent count. Each links to its species trend.

Species recorded on the Basin 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
Horned LarkAlaudidae382025+72%1997
Sage ThrasherMimidae302025-10%1997
Common RavenCorvidae292025-3%1997
Western MeadowlarkIcteridae172025-66%1997
Sagebrush SparrowPasserellidae172025+133%1997
BushtitAegithalidae122023+433%2006
Canada GooseAnatidae112019+450%2006
Spotted TowheePasserellidae92025+4%1997
Chipping SparrowPasserellidae82025+40%1997
Vesper SparrowPasserellidae72025-45%1997
Brewer's SparrowPasserellidae72025-72%1997
Northern MockingbirdMimidae72025-7%1997
Mountain BluebirdTurdidae72025-14%1997
House SparrowPasseridae72025+91%1998
Gunnison Sage-GrousePhasianidae72000n/an/a
American CrowCorvidae62025+88%2001
Mourning DoveColumbidae52025+200%1997
Loggerhead ShrikeLaniidae52024+225%1998
Bewick's WrenTroglodytidae52025-10%1997
Common NighthawkCaprimulgidae42025+117%2004
Gray FlycatcherTyrannidae42024+20%1997
Mountain ChickadeeParidae42022+150%1998
Western KingbirdTyrannidae42025+11%2000
GadwallAnatidae42010n/an/a
Red-tailed HawkAccipitridae32025+83%1998
Say's PhoebeTyrannidae32025+50%1997
Black-billed MagpieCorvidae32025+200%1997
Barn SwallowHirundinidae32025+171%1997
Rock WrenTroglodytidae32024+125%1997
Ash-throated FlycatcherTyrannidae32025+175%1999
KilldeerCharadriidae22024-67%1997
Brown-headed CowbirdIcteridae22025-73%1997
Juniper TitmouseParidae22023+75%2010
Blue-gray GnatcatcherPolioptilidae22025+11%1999
White-throated SwiftApodidae22018+133%2001
Lazuli BuntingCardinalidae22012+100%1996
Tree SwallowHirundinidae22005-57%2001
Blue GrosbeakCardinalidae22023+50%2001
Green-winged TealAnatidae22024+150%2010
Woodhouse's Scrub-JayCorvidae22025-14%2001

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