US Army Corps of Engineers
Portland District Website Website


graph comparing mean flow in logged vs. unlogged watershedsLogging is the harvest of trees for human use.


The figure to the right shows increased sediment load for uncut, partly cut (30-50%) and clear-cut (95-100%) watersheds (Lewis et al. 2001).


Controlling factors that are affected by logging:

Contact information

Ronald Thom, Ph.D

Marine Research Operations, PNNL
1529 W. Sequim Bay Rd.
Sequim, WA 98382