Abstract
Engineered large woody debris (LWD) structures are frequently used for habitat restoration and enhancement, bank protection and stabilization, and to alter flow within a channel. This paper discusses current LWD guidelines as well as ongoing field investigations on constructed LWD structures in the Middle Fork John Day River near John Day, OR. Low altitude balloon photogrammetry was completed for seventeen structures on the Middle Fork John Day to complete a stability and effectiveness assessment of the LWD structures. A habitat evaluation of the structures was also completed. The structures have experienced just over a 2-year peak discharge since constructed and are still in place. Preliminary findings show that the structures are generally acting as intended by altering channel morphology through locally narrowing the channel, adding pools, forming bars, and providing cover for fish habitat. The next step for the field analysis is to look at the stability of each LWD structure and perform quantitative comparisons.
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