Hernandez Reservoir is located in San Benito County, California in the Diablo Mountain Range. The reservoir was created by the 124-foot tall Hernandez Dam, an earthen structure built in 1962 for irrigation and flood control purposes. With a capacity of 18,000 acre-feet, Hernandez Reservoir plays an important role in water management for the region.

Safety is a key consideration for paddlers. The dam is classified as high-hazard potential, meaning a failure could potentially result in loss of human life downstream. However, local water authorities state the dam is operating as designed and is monitored regularly. The San Benito County Water District inspects the dam every other week.

Water levels in the reservoir can fluctuate significantly based on rainfall and releases. As of March 2023, the reservoir was at 100% capacity with water flowing over the spillway. This was the first time in many years the reservoir had reached this level. Typically, it takes 12-16 hours for water to flow from the headwaters of the San Benito River to fill the reservoir after significant rainfall.

The surrounding landscape is characterized by mountainous terrain. Wildlife in the area includes various bird species. The reservoir's remote location in southern San Benito County means facilities and amenities for paddlers are limited.

Paddlers should be aware that access and patrol of the area is limited. The San Benito County Sheriff's Office has minimal presence in the southern part of the county due to staffing and communication challenges.

Before planning any paddling trips, visitors should contact the San Benito County Water District for current conditions, access information, and any restrictions or regulations regarding recreational use of the reservoir.