BirdAnalyst
Species · BCR 9 · BBS 2025 Release · 1966–2024

Black-crowned Night Heron In Great Basin

All regionsGreat BasinWetland birds

Black-crowned Night Heron in Great Basin has surged: up 80% on the route-weighted index since 1971.

+80%Since 1971
76Routes In Region
55Years

Notable Signals

long arc increasecomputed index

Black-crowned Night Heron has surged in Great Basin: up 80% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Black-crowned Night Heron in Great Basin is projected to stay roughly flat through 2029, near 0.22 (95% range 0.00–0.62). A 5-year backtest shows a typical error of ±294.7%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.22Projected 2029 index
0.00–0.6295% range
±294.7%Backtest error
19692029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.240.000.64
20260.230.000.64
20270.230.000.63
20280.220.000.63
20290.220.000.62

Routes In Great Basin

Routes recording Black-crowned Night Heron in Great Basin.
DorrisCALIFORNIA392019
Bear RiverUTAH82023
Oak CityUTAH72011
BrewsterWASHINGTON71986
EurekaNEVADA61998
Honey LakeCALIFORNIA52019
KeystoneWASHINGTON42022
PotholesWASHINGTON42019
Iron GateCALIFORNIA32017
TriangleIDAHO32021
Fish LakeOREGON32018
MacdoelCALIFORNIA22018
Majors PlaceNEVADA22010
Ruby ValleyNEVADA21999
Barnes ValOREGON21972
PrincetonOREGON21985
UmatillaOREGON22021
DeltaUTAH22006
PrescottWASHINGTON22010
NubieberCALIFORNIA12016
RavendaleCALIFORNIA11995
LikelyCALIFORNIA12011
Crowley LakeCALIFORNIA12023
Davis CreekCALIFORNIA12021
Clear Lk ResCALIFORNIA11999

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