COMMON LIMITING FACTORS in WRIA 22-23 and their impact to physical processes and salmon

Fish Passage

Physical Process Effects

Poor fish passage conditions are typically a result of improperly sized water crossing structures.   Undersized stream crossing structures do not allow for adequate transport of substrate, LWD, or fish.  In many cases the area immediately upstream of undersized crossing structures accumulates sediment and LWD and the area immediately downstream is scoured.  These symptoms are a direct result of altered stream flow in the specific location of the crossing. 

Robinson Culvert before RestorationRobinson - Salzer Creek completed project