Evaluating Beaver Guards on Restricted Flow Risers of Flood Control Impoundments

Eight types of guards, designed to prevent plugging of restricted flow risers by beaver, were tested on Soil Conservation Service flood control impoundments. The effectiveness of these guards was studied between August 1975 and September 1976. Four guard types were unsuccessful in preventing plugging of risers by beaver. Risers protected by the other four guard types were not plugged, although some had been plugged prior to the installation of the guards. A guard similar to type 5 showed the most promise for preventing plugging.