1967 Map of Lake Mathews

About this map

Lake Mathews and its massive Mathews Dam dominate this Riverside County landscape, where the Colorado River Aqueduct terminates into the reservoir's eastern reach. The map captures a complex industrial and historical corridor along Temescal Wash, marked by small settlements like Arcilla, Olsen, and Weisel. Local history is deeply preserved on this sheet through unique landmarks, including the Indian Pictographs Historical Marker and the designated Site of the First House in Riverside County near the southwestern corner. Extractive industries are evident at the Gajaldo Tin Mine and various quarries, while the southwestern edge touches the Cleveland National Forest and the legendary Glen Ivy Hot Springs. Old land boundaries are still legible, such as the El Sobrante De San Jacinto Grant Bdy, reflecting the region's ranching heritage.