BirdAnalyst
Species · BCR 16 · BBS 2025 Release · 1966–2024

Marsh Wren In Southern Rockies / Colorado Plateau

All regionsSouthern Rockies / Colorado PlateauForest birds

Marsh Wren in Southern Rockies / Colorado Plateau has fallen sharply: down 70% on the route-weighted index since 1992.

-70%Since 1992
16Routes In Region
32Years

Notable Signals

long arc declinecomputed index

Marsh Wren has fallen sharply in Southern Rockies / Colorado Plateau: down 70% on the route-weighted index since 1992.

Forecast

If the recent trend holds, Marsh Wren in Southern Rockies / Colorado Plateau is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±192%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.00Projected 2029 index
0.00–0.1495% range
±192%Backtest error
19892029
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
20250.000.000.14
20260.000.000.14
20270.000.000.14
20280.000.000.14
20290.000.000.14

Routes In Southern Rockies / Colorado Plateau

Routes recording Marsh Wren in Southern Rockies / Colorado Plateau.
MoffatCOLORADO31995
WaldenCOLORADO32024
AlamosaCOLORADO32017
San LuisCOLORADO32000
PaoniaCOLORADO32003
Yellowjacket PassCOLORADO32018
BicknellUTAH32013
Marshall PasCOLORADO22012
DoylevilleCOLORADO12022
CortezCOLORADO12007
DinosaurCOLORADO12012
AngoraCOLORADO12022
BoulderUTAH12006
Castle DaleUTAH12023
HatchUTAH12011
KamasUTAH11997

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