BirdAnalyst
Species · Maryland · BBS 2026 Release · 1966–2025

Common Raven Population Trend in Maryland

All statesGeneralists

Common Raven in Maryland has surged: up 78× on the route-weighted index since 1974.

78×Since 1974TrendPercent 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 →
25Routes 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 →
48YearsYears 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 MarylandNotable 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 Maryland. See the full index history below.

Common Raven Population Forecast in Maryland

If the recent trend holds, Common Raven in Maryland is projected to stay roughly flat through 2030, near 1.1 (95% range 0.50–1.8). A 5-year backtest shows a typical error of ±47.4%, with 40% of held-out values landing inside the 95% band.

-1%Change by 2030TrendPercent 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 →
1.1Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.50–1.895% 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 →
±47.4%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 Maryland is projected to stay roughly flat through 2030, near 1.1 (95% range 0.50–1.8). A 5-year backtest shows a typical error of ±47.4%, with 40% of held-out values landing inside the 95% band.19672030
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 →
20261.00.401.7
20271.10.431.7
20281.10.451.7
20291.10.471.8
20301.10.501.8

Common Raven Survey Routes in Maryland

Routes recording Common Raven in Maryland.
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 →
Vindex1520241967
Green Ridge1120251995
Finzel1020251995
Jennings720251997
Jessup520242022
Floyd420251979
Williamsport420242013
Ijamsville420232011
Pleasant Val320192019
Steyer320241997
Mt Nebo219891975
Oldtown220251977
Wolfsville220252007
Emmitsburg220252014
Olney220252012
Madonna220222022
Piney Grove220251995
Potomac Park120252008
Smithsburg120142009
Eklo119781978
Cokesbury120242024
Accident 2120242019
Accident120171997
Davidsnville120232023
Island Creek120252023

Common Raven Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutgeorgiaidahokentuckymainemassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.