BirdAnalyst
BBS Route · Colorado · BCR 16

Lost Lake Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 99 species recorded across 26 survey years, still active.

99Species 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 →
26Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1990–2024Span
5Observers

Bird Species Found on Colorado Lost Lake

Top 40 of 99 species by most recent count. Each links to its species trend.

Species recorded on the Lost Lake 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
American RobinTurdidae402024-42%1994
Ruby-crowned KingletRegulidae292024-12%1994
Warbling VireoVireonidae212024+6%1994
Broad-tailed HummingbirdTrochilidae192024+10%1994
White-crowned SparrowPasserellidae192024+208%1995
Tree SwallowHirundinidae152024+125%1994
Pine SiskinFringillidae142024-4%1994
Brewer's BlackbirdIcteridae132022+100%1999
Dusky FlycatcherTyrannidae122024+4%1994
Wilson's WarblerParulidae122024+32%1994
Mountain ChickadeeParidae122024+38%1994
Vesper SparrowPasserellidae12202411×1995
Cliff SwallowHirundinidae122024+55%1995
Western Wood-PeweeTyrannidae112024+257%1994
Green-tailed TowheePasserellidae112024+340%1999
Hermit ThrushTurdidae102024-43%1994
Violet-green SwallowHirundinidae92024+147%1995
Black-billed MagpieCorvidae92024+450%1996
Lincoln's SparrowPasserellidae82024+150%1995
Mourning DoveColumbidae72024+75%2002
Red-winged BlackbirdIcteridae72024-15%1995
Northern House WrenTroglodytidae72024+100%1995
MacGillivray's WarblerParulidae62024-18%1999
Red-breasted NuthatchSittidae62024+86%1994
Hammond's FlycatcherTyrannidae52024+200%1996
Brewer's SparrowPasserellidae52024-24%2001
Red CrossbillFringillidae42024-32%1994
Western MeadowlarkIcteridae42024+150%1996
Western TanagerCardinalidae42024+20%2001
Olive-sided FlycatcherTyrannidae42024+120%2001
Steller's JayCorvidae42024+0%2000
California GullLaridae42010+250%2002
Sandhill CraneGruidae42024+100%2005
American CrowCorvidae32024-47%1994
Northern Rough-winged SwallowHirundinidae32022-25%1990
Sage ThrasherMimidae32023+167%1995
Mountain BluebirdTurdidae32024-22%1994
American KestrelFalconidae32024+0%2003
Common GrackleIcteridae32006+0%2001
Fox SparrowPasserellidae32024+100%2012

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