After rerouting State Route 17 near Windy Point, which is a mile south of Los Gatos, the District began dam construction in the spring of 1952, completing it that fall.

Each of the towns had a post office, hotel, saloons, blacksmith shops, and half a dozen redwood sawmills.

Their sensational trial in San Jose drew national attention similar to that accorded to the Lizzie Borden axe murders nine years later.

[3] In September 2007, the Santa Clara Valley Water District began its “Lenihan Dam Outlet Project” at Lexington Reservoir.

This project replaced the old 48-inch (1,200 mm) outlet pipe that ran through the base of the dam, from the reservoir to Los Gatos Creek.

The new outlet pipe, which runs through a new tunnel in Saint Joseph's Hill, on the east side of the dam, also features new actuating valves, and a new intake structure.

The Santa Clara Valley Water District features a "Lexington Reservoir & Lenihan Dam Project" page on its website.

The California Office of Environmental Health Hazard Assessment (OEHHA) has developed a safe eating advisory for Lexington Reservoir based on levels of mercury or PCBs found in fish caught from this water body.

[9] The park includes part of the San Andreas Fault, which crosses Los Gatos Creek just south of the upstream end of the reservoir.