Good question. I found this info on another page: "historical average level of the reservoirs at the same time of year (e.g. March 8th) between 1960 and 2010."

Good question. I found this info on another page: "historical average level of the reservoirs at the same time of year (e.g. March 8th) between 1960 and 2010." https://engaging-data.com/ca-reservoir-level/ https://engaging-data.com/ca-reservoir-level/