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

Common Raven Population Trend in Tennessee

All statesGeneralists

Common Raven in Tennessee has held roughly steady: down 1% on the route-weighted index since 1994.

-1%Since 1994TrendPercent 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 →
7Routes 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 →
24YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

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

No notable trend signals for Common Raven in Tennessee. See the full index history below.

Common Raven Population Forecast in Tennessee

If the recent trend holds, Common Raven in Tennessee is projected to rise about 52% by 2027 — from 0.07 in 2022 to a central estimate of 0.10 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±33.8%, with 80% of held-out values landing inside the 95% band.

+52%Change by 2027TrendPercent 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 →
0.10Projected 2027 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.2195% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±33.8%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Common Raven in Tennessee is projected to rise about 52% by 2027 — from 0.07 in 2022 to a central estimate of 0.10 (95% range 0.00–0.21). A 5-year backtest shows a typical error of ±33.8%, with 80% of held-out values landing inside the 95% band.19902027
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20230.090.000.20
20240.090.000.20
20250.100.000.20
20260.100.000.21
20270.100.000.21

Common Raven Survey Routes in Tennessee

Routes recording Common Raven in Tennessee.
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 →
Newfound Gap220171990
Cades Cove220191991
Cornpone220122012
Tellico120211998
Allens Brdge120222018
Fish Springs120221994
Elk Valley120212021

Common Raven Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutgeorgiaidahokentuckymainemarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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