Blossom Valley Reservoir, located in Lakeside, California, is a vital offstream water supply structure managed by a public utility. Built in 1962, this Earth dam stands at a height of 42 feet and has a storage capacity of 22 acre-feet. The primary purpose of the reservoir is to support irrigation and water supply needs in the region, making it a critical resource for the local community.

This reservoir is under the regulatory oversight of the California Department of Water Resources, ensuring that it meets safety and operational standards. With a high hazard potential but a satisfactory condition assessment as of September 2017, Blossom Valley Reservoir is regularly inspected to maintain its integrity. The last inspection in March 2021 reaffirmed its safe operation, highlighting the importance of proper management and upkeep of water resources in the face of changing climate conditions.

As climate change continues to impact water availability and management, reservoirs like Blossom Valley play a crucial role in safeguarding water supplies for agriculture, drinking water, and other essential needs. The reservoir's location in San Diego County underscores its significance in maintaining water security for the region, emphasizing the importance of sustainable water resource management practices for a resilient future.