BirdAnalyst
Species · Idaho · BBS 2025 Release · 1966–2024

Merlin Population Trend in Idaho

All statesGeneralists

Merlin in Idaho has fallen sharply: down 68% on the route-weighted index since 1976.

-68%Since 1976TrendPercent 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 →
8Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
17YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Merlin Trends in IdahoNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Merlin has fallen sharply in Idaho: down 68% on the route-weighted index since 1976.

Merlin Survey Routes in Idaho

Routes recording Merlin in Idaho.
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 →
Blacks Creek519821974
Naples120221979
Avery120092009
Kyle Canyon120241989
Cascade119721972
Burgdorf120152015
Springfield119801976
Ririe120102010

Merlin Population Trend in Other States

alaskamainemassachusettsmichiganminnesotamontananebraskanew-hampshirenew-yorknorth-dakotaoregonpennsylvaniasouth-dakotavermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.