BirdAnalyst
BBS Route · Colorado · BCR 16

Dolores Riv Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 106 species recorded across 35 survey years, still active.

106Species 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 →
35Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1988–2025Span
3Observers

Bird Species Found on Colorado Dolores Riv

Top 40 of 106 species by most recent count. Each links to its species trend.

Species recorded on the Dolores Riv 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
Warbling VireoVireonidae842025+7%1992
American RobinTurdidae762025-16%1992
Violet-green SwallowHirundinidae722025-19%1992
Ruby-crowned KingletRegulidae422025+120%1992
Pine SiskinFringillidae392025-84%1992
Western TanagerCardinalidae362025+41%1992
Western Wood-PeweeTyrannidae222025-72%1992
Black-billed MagpieCorvidae222025+177%1992
Steller's JayCorvidae192025+64%1992
Lincoln's SparrowPasserellidae192025+117%1993
Dusky FlycatcherTyrannidae182025+650%1997
Broad-tailed HummingbirdTrochilidae142025-27%1992
Brewer's BlackbirdIcteridae142025+325%2005
Northern House WrenTroglodytidae112025-31%1992
American GoldfinchFringillidae102017+900%2012
White-crowned SparrowPasserellidae92025-77%1992
MacGillivray's WarblerParulidae92025+333%1992
Hammond's FlycatcherTyrannidae92025+20%1995
Chipping SparrowPasserellidae72025-62%1992
Fox SparrowPasserellidae72025-30%1994
Mountain ChickadeeParidae72025+130%1992
American CrowCorvidae72025+150%1999
Orange-crowned WarblerParulidae62025-30%1995
Hermit ThrushTurdidae62025+13%1992
European StarlingSturnidae52019-46%1992
Tree SwallowHirundinidae52024-41%1996
Virginia's WarblerParulidae52025-35%1994
White-throated SwiftApodidae51995n/an/a
Blue-gray GnatcatcherPolioptilidae51997n/an/a
Evening GrosbeakFringillidae42021+0%1998
Cassin's FinchFringillidae42025-90%1993
Song SparrowPasserellidae42025+8%1992
Band-tailed PigeonColumbidae42002-33%1998
Cedar WaxwingBombycillidae42005+300%1999
Black SwiftApodidae42015n/an/a
Olive-sided FlycatcherTyrannidae32024-52%1992
Black-headed GrosbeakCardinalidae32025-24%1992
Yellow WarblerParulidae32025-66%1992
Pygmy NuthatchSittidae31995+0%1991
Common MerganserAnatidae32018+40%2000

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