An 18-year stream experiment makes maintenance central to restoration

Large wood additions changed channel shape, but managers had to replenish and adapt to connect floodplains.

Wild Lands Ecological Intelligence Editor
Wild Lands Institute · 8 October 2026

Evidence: Peer-reviewed long-term controlled experiment
Geography: Asotin Creek, Washington, USA
System: Headwater streams / floodplain geomorphology

WHAT THE EVIDENCE SAYS

Across three tributaries, crews installed 654 large-wood structures, then added maintenance wood and adaptive beaver analogues. Channel bar and pool areas and side channels expanded with flood, fire and later treatments.

WHY IT MATTERS / OUR READ

Installation counts are not outcomes. Riverscape interventions require follow-up, sediment and wood recruitment, and allowance for major disturbance events.

CAVEATS / UNCERTAINTY

This measures geomorphic and connectivity change, not a demonstrated proportional fish-population gain; it reflects a particular watershed.

SOURCE

Frontiers in Ecology and Evolution · 18-year field study
View original evidence ↗