Stream Condition Monitoring

August 9, 2017

Chazen monitored stream conditions at a new bridge crossing the East Branch of the Ausable River. The purpose of the review was to monitor, per the conditions of a Corps of Engineers permit, whether the new bridge construction caused changes to the stream’s geomorphology.

Chazen’s Stream Condition Assessment included surveyed documentation of the stream thalweg and cross sections upstream, downstream and at the new bridge. Chazen biologists completed a visual conditions assessment, documenting bed and bank conditions, examined areas of deposition or scour, and evaluated river substrate materials.

During the review period, significant Hurricane Irene flooding occurred, warranting unique attention to post-flood documentation of scour and sediment transport. Chazen’s 2012 site visit documented significant hurricane related sediment transport and vegetative damage in the vicinity of the bridge.