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

Marbled Murrelet Population Trend in Washington

All statesGeneralists

Marbled Murrelet in Washington has collapsed: down 88% on the route-weighted index since 1987.

-88%Since 1987
4Routes In State
19Years

Notable Marbled Murrelet Trends in Washington

long arc declinecomputed index

Marbled Murrelet has collapsed in Washington: down 88% on the route-weighted index since 1987.

Marbled Murrelet Population Forecast in Washington

If the recent trend holds, Marbled Murrelet in Washington is projected to stay roughly flat through 2027, near 0.01 (95% range 0.00–0.34). A 5-year backtest shows a typical error of ±1473.4%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2027
0.01Projected 2027 index
0.00–0.3495% range
±1473.4%Backtest error
19852027
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
20230.030.000.35
20240.020.000.35
20250.020.000.35
20260.020.000.34
20270.010.000.34

Marbled Murrelet Survey Routes in Washington

Routes recording Marbled Murrelet in Washington.
Warm Beach2720021985
Mukilteo120182015
Ozette120221991
Port Angeles120072002

Marbled Murrelet Population Trend in Other States

alaskacaliforniaoregon

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