Point Arena Lighthouse

02-09-2019 - Point Arena, CA - The Point Arena Lighthouse at this site was constructed in 1870. The brick-and-mortar tower included ornate iron balcony supports and a large keeper residence with enough space to house several families. In April 1906, a devastating earthquake struck the light station. The keeper's residence and lighthouse were damaged so severely they had to be demolished. The United States Lighthouse Service contracted with a San Francisco based company to build a new lighthouse on the site, and specified that it had to be able to withstand any future earthquakes. The company chosen normally built factory smokestacks, which accounts for the final design for the new Point Arena Lighthouse, featuring steel reinforcement rods encased in concrete. This was the first lighthouse built this way. The new lighthouse began operation in 1908, nearly 18 months after the quake. It stands 115 feet (35 m) tall, and featured a 1st Order Fresnel Lens, over six feet in diameter and weighing more than six tons. The lens was made up of 666 hand-ground glass prisms all focused toward three sets of double bullseyes. It was these bullseyes that gave the Point Arena Lighthouse its unique "light signature" of two flashes every six seconds. The optics, which held an appraised value of over $3.5 million, was set in solid brass framework, and was built in France. [Wiki]

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