High Sierra Electronics Announces Innovative New Remote Erosion Monitoring System for Levees News provided by Share this article Share this article GRASS VALLEY, Calif., Feb. 23, 2021 /PRNewswire/ -- Today, High Sierra Electronics (hsierra.com), a Grass Valley, California-based, manufacturer of environmental monitoring products, announced a new system that can detect when and where levee erosion has occurred and automatically alert and inform levee owners, managers, and public safety officials. Richard Marck, a retired Levee Superintendent for the American River Flood Control District, shows one of the REMS beacons being used for the California Department of Water Resources-funded Levee Safety project on the Sacramento River.