California’s Two Largest Reservoirs Are Both Over 100% of Historical Average Today California’s two largest reservoirs, Shasta and Oroville, are both well above 100% of historical average today. Lake Shasta = 108% of historical average, 93% of capacity Lake Oroville =Â 116% of historical average, 96% of capacity Lake Folsom has also gotten in on the above 100% fun and is sitting at 108% of historical average today and 86% of capacity (only […] Industry News SnowBrains | May 17, 2016 0 Comments