Gibraltar Dam, Arch dam in Santa Barbara County, United States
Gibraltar Dam is an arch dam spanning across the Santa Ynez River nestled within the Los Padres National Forest mountains. The structure holds water to supply the region and serves as part of Santa Barbara's water system.
Construction started in 1913 and finished in 1920, making it the first structure built to control the Santa Ynez River's flow. The project arose from the region's growing need for a reliable water supply.
The dam takes its name from the Gibraltar mercury mine that once operated in the nearby area and shaped local industry for over a century. The mine's legacy remains connected to how residents understand their region's past.
The dam is visible from public roads but sits in a mountain area requiring a drive inland to reach. Visitors should know that access may be limited depending on the season and weather conditions.
Two debris barriers were built upstream to reduce sediment buildup, yet the reservoir continues to lose storage capacity over time. This loss shows how natural processes affect water storage across decades.
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