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

Common Raven Population Trend in Maryland

All statesGeneralists

Common Raven in Maryland has surged: up 87× on the route-weighted index since 1974.

87×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 →
47YearsYears 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 →

long arc increasecomputed 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 →

Common Raven has surged in Maryland: up 87× on the route-weighted index since 1974.

Common Raven Population Forecast in Maryland

If the recent trend holds, Common Raven in Maryland is projected to fall about 39% by 2029 — from 1.8 in 2024 to a central estimate of 1.1 (95% range 0.46–1.8). A 5-year backtest shows a typical error of ±51.6%, with 20% of held-out values landing inside the 95% band.

-39%Change by 2029TrendPercent 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 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.46–1.895% 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 →
±51.6%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 fall about 39% by 2029 — from 1.8 in 2024 to a central estimate of 1.1 (95% range 0.46–1.8). A 5-year backtest shows a typical error of ±51.6%, with 20% of held-out values landing inside the 95% band.19672029
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 →
20251.00.361.7
20261.00.391.7
20271.10.411.7
20281.10.431.7
20291.10.461.8

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 →
Green Ridge1620241995
Vindex1520241967
Oldtown720241977
Piney Grove620241995
Emmitsburg520242014
Jessup520242022
Williamsport420242013
Wolfsville420232007
Finzel420241995
Ijamsville420232011
Floyd320241979
Olney320242012
Pleasant Val320192019
Jennings320241997
Steyer320241997
Mt Nebo219891975
Madonna220222022
Potomac Park120232008
Smithsburg120142009
Eklo119781978
Cokesbury120242024
Accident 2120242019
Accident120171997
Davidsnville120232023
Island Creek120232023

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 2026-05-22.