The southern end of Padre Island and Point Isabel, a prominent bluff on the mainland, were both suggested as sites for the lighthouse. Local mariners favored Point Isabel, arguing that the island was subject to flooding and that a lighthouse on the elevated bluff could easily be seen beyond the low-lying, barrier islands.
Before being selected as the location for the lighthouse, Point Isabel had already played an important role in the area. The annexation of Texas by the United States sparked a war with Mexico, who had controlled Texas up until it became a republic in 1835. General Zachary Taylor established Fort Polk at Point Isabel and used it as a base for his military excursions into Mexico. After the war, the government retained the fort at Point Isabel for use by the customs service. The proposed site for the lighthouse was thus seemingly already in the possession of the federal government.
John S. Rhea, the Customs Collector for the port, recommended to Stephen Pleasonton, who oversaw the construction of U.S. lighthouses, that a masonry tower be built using local contractors, writing, “The building can be erected at Point Isabel of brick cheaper than any other material owing to the very reduced price of Mexican labour.” John E. Garrey of nearby Brownsville was contracted to build the fifty-foot, brick tower. Work began in December 1851, and the tower was nearly complete by September of the following year. The spiral staircase and lantern room were shipped from New York aboard the Brownsville, but it wrecked en route, delaying the completion of the tower until early spring of 1853. Fifteen lamps, backed by twenty-one-inch reflectors were used in the lantern room, and the light was exhibited for the first time on March 20, 1853.
J.H.B. Ham, the first keeper, lived with his family in a structure surplused from the adjacent Fort Polk. After a visit to the site, the Galveston lighthouse inspector declared the dwelling inadequate and successfully petitioned for a new one that was finished in 1855. Two years later, the lighthouse received a third-order Fresnel lens illuminated by a single lamp, which greatly simplified the keeper’s chores. When Ham died in 1860, his wife Hannah, who had been serving as assistant keeper, assumed the role of head keeper and served until the tower was deactivated during the War Between the States.
With control of the port, Union officers petitioned the Lighthouse Board to repair the tower and return it to service, but due to the ongoing war, years passed before the repairs could be accomplished. The lighthouse was finally reactivated on February 22, 1866, with Benjamin Bergreen as its new keeper.
In 1878, a work crew was sent to construct a screwpile lighthouse, known as Brazos Santiago Lighthouse, near the southern end of Padre Island. While in the area, the workers also attempted to repair the leaky lantern room atop Point Isabel Lighthouse, but water still succeeded in penetrating the tower. In 1897, the Lighthouse Board noted the following about Point Isabel Lighthouse its annual report:
The lantern on this tower is in a dilapidated condition, and should be renewed. During a rain it is impossible to keep the lens and lamps dry, as the lantern leaks in every direction. It has been found impossible to repair it without taking down the lantern and removing every piece of iron used in its construction. The building is a very old one. The brick-work of the tower is in good condition. It is recommended that the lantern be taken down, and the tower be provided with a new and improved lantern and an iron gallery at the watch-room floor; thereby adding to the efficiency of this important aid to navigation in the West Gulf.A new lantern room was installed in 1881.
In March 1886, James B. Wells of Brownsville notified the Lighthouse Board that he was the rightful owner of the property on which Point Isabel Lighthouse stood. He elevated his claim the following year by suing the lighthouse keeper for trespassing. The federal government never had secured a title for the property since occupying the point during the War with Mexico. Rather than paying the owner for the property, the Lighthouse Board decided Brazos Santiago Lighthouse alone was sufficient for navigation in the area, and Point Isabel Lighthouse was discontinued on May 15, 1888. Vociferous demands by the local population and politicians calling for the restoration of the light eventually persuaded Congress to allocate funds to acquire the property. The owner settled for a purchase price of $5,000, and the lighthouse sent forth its beams of light again in July 1895.
The bluff surrounding the tower was lowered to form level city blocks, leaving the lighthouse perched on a small mound. The town promoters went bankrupt during the depression, and the structure fell into disrepair. The state eventually stepped in to save the lighthouse, accepting the property from Lon C. Hill and allocating twenty-five thousand dollars for repairs and maintenance. The dedication and formal opening of the park was held on April 26, 1952, during the tower’s centennial year. On January 27, 1955, the lighthouse returned to operation as a private aid to navigation.
Today, the square block encompassing the lighthouse is Texas’ smallest state park: Port Isabel Lighthouse State Historical Park. The lighthouse was fully restored in 2000, when a replica of the keeper’s dwelling was built to house an interpretive display and the offices of the Port Isabel Chamber of Commerce. Point Isabel Lighthouse is the only lighthouse in Texas open for climbing, and the panoramic views of Laguna Madre and South Padre Island are well worth the small admission fee and the minor exertion required to surmount the tower.