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Pigeon Key Historic District
Pigeon Key seen from the Seven Mile Bridge..
Pigeon Key is located in Florida
Pigeon Key
Pigeon Key is located in the United States
Pigeon Key
LocationOff US 1 at mile marker 45, Monroe County, Florida
Nearest cityIslamorada
Coordinates24°42′14″N 81°09′19″W / 24.703991°N 81.155308°W / 24.703991; -81.155308
Area5 acres (2.0 ha)
Built1912
Architectural styleVernacular Frame
NRHP reference No.90000443[1]
Added to NRHPMarch 16, 1990

Pigeon Key is a small island containing the historic district of Pigeon Key, Florida. The 5-acre (2.0-hectare) island is home to 8 buildings on the National Register of Historic Places. The former Assistant Bridge Tender's House has been converted into a small museum featuring artifacts and images from Pigeon Key's past. It is located off the old Seven Mile Bridge, at approximately mile marker 45, west of Knight's Key, (city of Marathon in the middle Florida Keys) and just east of Moser Channel.

Buildings remaining from the era of Henry Flagler's Overseas Railroad Key West Extension between 1908 and 1912 are now part of the Pigeon Key Historic District.[citation needed]

Much of the 1978 television film Hunters of the Reef was shot on Pigeon Key.[2] Pigeon Key was one of the locations for the "Bal Harbor Institute" in the 1995 series of Flipper. It was seen in three episodes during season one including the pilot episode. It was also the site of the Finish Line of The Amazing Race 18 "Unfinished Business" in 2011.[3]

Pigeon Key Historic District

[edit]
Main article: Pigeon Key Historic District

The Pigeon Key Historic District is a U.S. historic district (designated as such on March 16, 1990) located on Pigeon Key in Florida. The district is off U.S. 1 at mile marker 45. It contains 11 historic buildings and 3 structures. The old Seven Mile Bridge (closed to vehicular traffic) crosses over the island and has a pedestrian exit ramp going to the island.

References

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Pigeon Key

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from Grokipedia
Pigeon Key is a historic five-acre in the , located approximately two miles west of Marathon beneath the Old , serving as a preserved remnant of the early 20th-century railroad era and a modern center for education and marine science. Originally charted as Cayo Paloma by Spanish explorers, the likely derived its name from the abundant white-crowned pigeons that once populated the Keys. In the early 1900s, it played a pivotal role in the construction of Henry Flagler's , functioning as a bustling construction camp from 1908 to 1912 that housed over 400 workers in four large bunkhouses, along with facilities including a , post office, and school established by 1923. Following the railroad's completion in 1912, Pigeon Key transitioned into a and bridge-tender camp for the until the devastating destroyed much of the line, leading to its repurposing as headquarters for the Road and Toll Bridge District and later the , which opened in 1938. During , the U.S. briefly occupied the island in 1943, and from 1968 to 1988, it operated as an environmental field station for the , supporting research on tropical marine and island ecologies. Preservation efforts intensified in the late 20th century, with the island designated a on the in 1990 and recognized as a Monroe County historical and cultural landmark in 1993; the Pigeon Key Foundation assumed management that year, undertaking restorations funded by state grants and donations to highlight its eight surviving structures, including unique concrete bridge piers. Today, Pigeon Key functions as a multifaceted educational and recreational site, offering guided historical tours, snorkeling excursions, technology-free summer camps, and marine science field trips that emphasize the cultural and ecological heritage of the , accessible via a two-mile pedestrian and bicycle path along the Old .

Geography

Location and Physical Description

Pigeon Key is a small in the archipelago, located in , . It is positioned off the old at mile marker 45 along U.S. Highway 1, west of Knight's Key and between the communities of Marathon and Islamorada. The island's coordinates are approximately 24°42′14″N 81°09′19″W. The island measures about 5 acres in size and forms part of a larger 52-acre rectangular Area established for habitat protection. This designation encompasses the surrounding waters to safeguard sensitive ecosystems adjacent to the key. Geologically, Pigeon Key consists of low-lying coral and limestone formations characteristic of the Middle , with elevations remaining minimal above , rarely exceeding a few feet. The includes a donut-shaped fringed by mangroves, encircled by shallow coastal waters featuring beds and hard-bottom substrates. Remnants of the historic rail are integrated into the natural , and the island lies adjacent to the Moser Channel, a key navigational passage in the region.

Climate and Environmental Setting

Pigeon Key experiences a tropical savanna climate classified as Aw under the Köppen system, characterized by warm temperatures, high humidity, and distinct wet and dry seasons typical of the Florida Keys. Average annual temperatures range from 70°F to 85°F, with minimal seasonal variation; for instance, daily highs average around 84°F and lows about 73°F in the nearby Marathon area. Humidity remains consistently high throughout the year, often exceeding 75%, contributing to the region's muggy conditions. The wet season spans June through October, accounting for approximately 65% of the annual rainfall total of about 40 inches, while the dry season from December to April brings drier weather with only 25% of the precipitation. The island's low-lying position heightens its vulnerability to hurricanes, which frequently impact the due to their location in the Atlantic hurricane basin. Notable storms have caused significant erosion and flooding; the devastated the Middle Keys, including Pigeon Key, where strong winds and storm surges led to widespread destruction and abandonment of the settlement. Similarly, in 1960 brought hurricane-force winds and coastal flooding to the area, damaging structures and exacerbating erosion on the small island. These events underscore the ongoing risk from tropical cyclones, which can amplify environmental stresses through surge-induced inundation. Environmental conditions on Pigeon Key are shaped by saline soils, strong tidal influences, and increasing exposure to , all of which interact with its coastal setting. The island's soils exhibit high salinity due to , particularly as rising seas salinize and surface layers, limiting freshwater availability and affecting habitat stability. Tidal fluctuations drive periodic flooding and contribute to , while projections indicate high vulnerability for the Pigeon Key , with potential inundation of low-elevation areas under moderate scenarios. As part of the larger subtropical barrier reef ecosystem within the National Marine Sanctuary, Pigeon Key lies adjacent to living formations that buffer some wave energy but remain sensitive to these dynamic factors. Geologically, Pigeon Key formed from ancient coral reefs during the Pleistocene epoch, with its bedrock consisting primarily of highly porous Key Largo Limestone composed of fossilized coral and carbonate sands. This limestone structure facilitates rapid , allowing tidal waters and potential contaminants to percolate easily through the , influencing local . The porous nature of the formation, a remnant of submerged reef systems, also contributes to the island's susceptibility to erosion and under changing environmental pressures.

History

Early Settlement and Naming

Pigeon Key exhibits limited evidence of indigenous occupation, consistent with the broader region. The and tribes are documented to have utilized and the Keys for seasonal activities as early as 800 CE, focusing on , , and shellfishing in coastal and island environments. However, no archaeological findings confirm permanent or regular use of Pigeon Key itself, suggesting the small, isolated island remained largely uninhabited prior to European contact. The island's name originates from early Spanish nomenclature, appearing as "Cayo Paloma" on 18th-century charts, translating to "Island of Doves" or "Pigeon Island." This designation is attributed to abundant flocks of white-crowned pigeons (Columba leucocephala) that nested and foraged there, a species common to the mangrove habitats of the Keys. The English name "Pigeon Key" persisted in subsequent mappings, reflecting this avian association. During the 19th century, human activity in the Florida Keys remained sparse and transient, with islands like Pigeon Key serving occasional roles in the region's maritime economy. Fishermen from various nationalities, including Bahamians and Americans, used the Keys intermittently for sponging, turtling, and finfishing, often camping on remote cays without establishing permanent structures. Similarly, salvors—known as wreckers—patrolled the treacherous reefs for stranded vessels, auctioning recovered cargo in ports like Key West, though Pigeon Key's isolation limited its role to opportunistic stops rather than a hub. U.S. coastal surveys, initiated after the 1820s under the Treasury Department, began charting Pigeon Key's precise location amid the Middle Keys, highlighting its remote and undeveloped status.

Railroad Construction and Peak Use (1908–1935)

In 1908, Pigeon Key was established as a primary base camp for the construction of the Seven Mile Bridge, a critical segment of Henry Flagler's Overseas Railroad extending from mainland Florida to Key West. Financed by industrialist Henry Flagler, the project transformed the uninhabited five-acre island into a bustling work site, with the first dining quarters built to accommodate up to 100 laborers. By 1909, four additional dormitories were constructed, each housing 64 men, enabling the camp to support a peak population of around 400 workers during the intense building phase from 1910 to 1912. These workers, including many African American men recruited from the Bahamas and Florida as well as immigrants from other regions such as New York, endured harsh conditions, including 10-hour workdays six days a week for $1.25 daily wages (plus food and lodging), under a strict no-alcohol policy enforced by the Florida East Coast Railway. Daily life revolved around essential facilities such as worker dormitories, a commissary for supplies, and a hospital to address injuries from the demanding labor. Engineering oversight fell to Clarence S. Coe, Flagler's appointed superintendent, who directed the formidable task of bridging challenging waterways, including the Moser Channel—a deep, swift passage requiring innovative trestle and designs to span over two miles. This feat exemplified the project's ambition, as workers operated in two 12-hour shifts to maintain round-the-clock progress amid tropical storms and treacherous tides. The camp also included a to connect the isolated community to the outside world. Upon the Overseas Railroad's completion on January 22, 1912, Pigeon Key transitioned from a hub to a maintenance camp for bridge tenders, reducing the resident population to about 40 people who operated the line and tended the spans. In 1915, amid escalating tensions leading to , a was installed on the Moser Channel Bridge for coastal defense purposes. By 1923, to support families of the remaining staff and encourage settlement, a one-room schoolhouse was added, initially led by teachers Dorothy Tribble and McCommom. The era culminated in tragedy with the Labor Day Hurricane of September 2, 1935, a Category 5 storm that devastated over 40 miles of the , causing more than 400 deaths across the . Remarkably, Pigeon Key's structures withstood the onslaught relatively intact, positioning the island as a key southern base for rescue, relief, and evacuation efforts; survivors from nearby areas were sheltered there in the aftermath.

Transition to Highway and Wartime Role (1935–1960)

Following the devastating Hurricane of 1935, which destroyed much of the 's , Pigeon Key transitioned from a rail maintenance site to a key component of the emerging road infrastructure. The storm rendered the railroad economically unviable, prompting the to sell its right-of-way, including Pigeon Key, to the State of for $640,000 on , 1936. This acquisition enabled the creation of the by the newly formed Overseas Toll and Bridge District, which repurposed the rail tracks and bridges into a continuous automobile road, eliminating the need for ferries. The officially opened on December 25, 1938, integrating Pigeon Key as the operational headquarters for the Monroe County Toll Bridge Authority, where bridge tenders managed traffic flow across the drawbridges, including the nearby Moser Channel Bridge. As a , it generated over $1 million annually in until tolls were discontinued on April 15, 1954, after which the Toll District was dissolved and land ownership transferred to Monroe County on September 4, 1954. Pigeon Key's role during this period supported highway maintenance and oversight, with its existing structures adapted for administrative and residential use by tenders and staff. During , Pigeon Key assumed a strategic military function when the U.S. established on the island in 1943 to house personnel conducting coastal patrols along the . These patrols monitored for potential threats in the vital shipping lanes of the , utilizing the island's central location for rapid response. The wartime presence reinforced Pigeon Key's infrastructure, with the accommodating guards who ensured security amid heightened naval activity in the region. The period concluded with the impact of in September 1960, which severely damaged two buildings on Pigeon Key, leading to their demolition by burning to prevent further hazards. This event exacerbated the erosion of remaining rail-era remnants and underscored the island's vulnerability to tropical storms, even as it continued serving as a highway support outpost under Monroe County's jurisdiction.

Marine Research and Preservation Efforts (1960–Present)

In 1968, the leased Pigeon Key from Monroe County for use as an environmental field station, hosting international researchers focused on tropical marine ecology, including systems and island ecosystems, until the lease ended in 1988. The station facilitated hands-on studies of marine , contributing to broader understanding of habitats through field-based experiments and observations. The construction and dedication of the new in 1982 isolated Pigeon Key by bypassing it entirely, shifting the island from its prior role in highway maintenance to one of relative seclusion and emphasizing its potential for preservation. This development ended vehicular access via the old bridge, allowing the site to transition toward scientific and historic uses without ongoing transportation demands. On March 16, 1990, the Pigeon Key Historic District was added to the (NRIS ID: 90000443), recognizing its significance in railroad and marine history. In 1992, the Pigeon Key Foundation was established as a 501(c)(3) to oversee the island's stewardship, focusing on cultural and ecological protection. The following year, Monroe County designated Pigeon Key a historical and cultural landmark, further supporting preservation initiatives. Throughout the 1990s and 2000s, the foundation led building restorations using historic preservation grants totaling $884,801 and private donations, repairing key structures such as the Section Gang Quarters and to maintain their integrity. A 1991 consultant report estimated overall rehabilitation costs at $3.7 million, guiding these efforts to stabilize the site against deterioration. From 2008 to 2022, the old underwent a comprehensive $77 million restoration and maintenance program, with $41–43 million allocated to initial repairs; the section linking Marathon to Pigeon Key reopened to pedestrians and cyclists in January 2022 after closure in 2016. Today, the Pigeon Key Foundation continues preservation amid escalating climate threats, including and storm surges, which pose risks to the island's low-lying structures and marine surroundings; initiatives emphasize adaptive strategies like elevated infrastructure and ecosystem monitoring to safeguard the site's legacy.

Historic District

Key Buildings and Structures

The Pigeon Key Historic District, encompassing the five-acre island and its surrounding historic features, includes numerous contributing buildings and structures primarily from the Flagler railroad era, serving as a preserved snapshot of early 20th-century infrastructure in the . These elements highlight the island's role as a and camp, with many structures originally built to support the labor-intensive project. Worker housing formed the core of the island's early development, with original dormitories constructed between 1908 and 1912 to accommodate up to 400 laborers at peak times. These wooden bunkhouses, such as the Section Gang Quarters that could house 64 men each, were designed for the transient workforce building the ; today, they have been converted into cottages and dormitories for educational programs, with some serving as the foundation's main classroom. Later additions, like the post-1912 family residences for supervisors—including the Bridge Tender's House, Assistant Bridge Tender's House, Paint Foreman's House, and Bridge Foreman's House—provided more permanent quarters for married personnel and maintenance staff. These structures, sturdy wooden buildings elevated on pilings to withstand the tropical environment, now function as museums and visitor accommodations following restorations initiated in the 1990s. Support facilities were essential for sustaining the remote camp, including the built around 1908 as the island's first structure to feed and supply up to 100 workers daily with provisions like meals and goods. The , damaged by in 2017, has undergone stabilization and repair as part of ongoing preservation efforts funded by state grants and private contributions. Educational and military structures reflect the island's evolving uses beyond the railroad. The one-room schoolhouse, constructed in 1923, educated the children of maintenance workers and later married personnel, enabling families to reside on the island full-time. During , the 1943 Coast Guard barracks were added to house personnel monitoring the converted highway bridge for wartime security. Both have been restored and repurposed for interpretive exhibits in the modern museum setting. Remnants of the three-way Seven Mile Bridge, completed in 1912 as part of Henry Flagler's railroad, remain prominent structures within the district, including abandoned rail sections and the original approaches now integrated into the Overseas Highway. These concrete and steel elements, spanning the Moser Channel, suffered hurricane damage over the decades but have been partially rehabilitated, with ongoing repairs to the connecting ramp ensuring safe access while preserving their engineering legacy. Overall, the buildings and structures, many impacted by storms like Irma, have been stabilized and restored since the district's 1990 National Register listing, transforming Pigeon Key into an educational hub focused on maritime history and marine science.

National Register Significance

The Pigeon Key Historic District was listed on the on March 16, 1990, under reference number 90000443. This designation recognizes its national significance under Criterion A for its direct association with pivotal events in American transportation history, specifically the construction and operation of the Florida East Coast Railway's Overseas Extension from 1908 to 1912, which linked the mainland to Key West under the vision of industrialist Henry M. Flagler. The district embodies Flagler's engineering achievements in overcoming the challenging tropical environment to connect the isolated Keys, transforming regional accessibility and economic development. Under Criterion C, the district exemplifies distinctive and from the early , featuring rare surviving examples of railroad worker settlements with rustic wood-frame structures elevated on pilings and braced for hurricane resistance. These buildings, adapted to the subtropical climate with features like wide verandas and durable tropical hardwoods, represent an intact industrial camp layout that illustrates adaptive construction techniques for remote labor housing during the railroad era. The site's cultural importance extends to its role in preserving the legacy of the , which facilitated connectivity across the Keys until its partial destruction in the , after which sections were repurposed for the . Pigeon Key gained broader public recognition as the finish line for the 18th season finale of the television series in 2011, highlighting its historical and scenic value. Ongoing preservation efforts underscore the district's value against environmental threats such as and storm surges, which endanger this unique juxtaposition of industrial heritage within a fragile natural setting.

Ecology and Wildlife

Terrestrial and Mangrove Ecosystems

Pigeon Key's terrestrial ecosystems are dominated by mangrove forests that serve as critical coastal buffers against erosion and storms, with (Rhizophora mangle), black (Avicennia germinans), and white (Laguncularia racemosa) mangroves comprising the primary vegetation. These species thrive in the island's saline, intertidal zones, where mangroves occupy the outermost fringes with their prop roots stabilizing shorelines, black mangroves form mid-zone thickets, and white mangroves inhabit slightly higher, less inundated areas. The mangroves cover much of the surrounding 52-acre Pigeon Key Area (WMA), encompassing the 5-acre and adjacent waters, providing essential connectivity within the National Marine Sanctuary. The WMA protects several specialized species adapted to these mangrove habitats, including the mangrove diamondback terrapin (Malaclemys terrapin rhizophorarum), a endemic to the Florida Keys' brackish marshes and mangroves, which feeds on invertebrates like crabs and snails. Also safeguarded are the mangrove salt marsh snake (Nerodia clarkii compressicauda), a non-venomous watersnake that preys on small fish and amphibians in saline wetlands, and nesting sites for wading birds such as the (Platalea ajaja), which uses the mangroves for breeding and foraging on crustaceans. Roosting sites for magnificent frigatebirds (Fregata magnificens) further highlight the area's role as a avian refuge, with these protections aimed at minimizing human disturbance to sensitive life cycles. Beyond mangroves, the island's limited upland areas—constrained by its small 5-acre size—support hardy tropical flora adapted to saline conditions, such as salt-tolerant grasses, shrubs, and occasional buttonwood () trees that transition from edges. These plants exhibit physiological adaptations like salt excretion glands and to survive periodic flooding and high . The overall flora emphasizes resilience in a compact, low-elevation environment with minimal soil development. As part of the NOAA-managed National Marine Sanctuary, the Pigeon Key WMA enforces strict access restrictions, including no-entry zones, to preserve these ecological communities from recreational impacts like boating and foot traffic. These measures ensure the integrity of buffers and protected habitats, supporting broader in the Upper Keys.

Marine Habitats and Biodiversity

The surrounding waters of Pigeon Key form part of the extensive Tract, the third largest barrier reef system in the world, spanning approximately 2,900 square kilometers and encompassing diverse marine habitats such as patch reefs, seagrass beds, and shallow hardbottom communities. Located in the shallow Moser Channel, these habitats include scattered patch reefs like Coffins Patch and Delta Shoals, which historically featured formations of elkhorn (Acropora palmata) and staghorn (Acropora cervicornis) corals but now have critically low live cover of these due to bleaching and ; alongside brain corals (Colpophyllia natans) and other stony that build complex structures. Seagrass beds dominated by turtle grass (), manatee grass (Syringodium filiforme), and shoal grass (Halodule wrightii) thrive in the protected, low-energy waters adjacent to the island, providing foundational ecosystems that stabilize sediments and support primary productivity. Biodiversity in these marine habitats is rich, hosting a variety of tropical fish species such as parrotfish (Scarus spp.) and moray eels (Gymnothorax funebris), which graze on algae and invertebrates to maintain reef health. Larger mobile species like spotted eagle rays (Aetobatus narinari) frequent the area, gliding over seagrass meadows and patch reefs in search of crustaceans and mollusks. Invertebrates, including sponges and sea fans, encrust the hardbottom substrates, while corals such as brain (Colpophyllia natans) create microhabitats that shelter juvenile fish and support symbiotic relationships with zooxanthellae algae for nutrient cycling. Nearby reefs like Sombrero Key, just six miles south, extend this diversity with spur-and-groove formations teeming with nurse sharks (Ginglymostoma cirratum) and green sea turtles (Chelonia mydas). These habitats play a critical ecological role as nurseries for numerous marine species, with seagrass beds serving as essential refuges for and that later migrate to reefs for maturation. The Current, a branch of the , influences water circulation around Pigeon Key, delivering nutrient-rich waters that enhance productivity and facilitate larval dispersal across the reef tract. This connectivity supports the broader ecosystem by promoting genetic exchange among patch reefs and hardbottom areas, bolstering resilience against localized disturbances. However, these marine habitats face significant threats, including driven by rising sea temperatures, which has led to over 90% loss of live coral cover in the since the 1980s. Recent marine heatwaves in 2023–2024 have resulted in the of elkhorn and staghorn corals across the reef tract, with nearly 100% mortality in some areas as reported in 2025. depletes key species like , disrupting herbivory and allowing algal overgrowth on reefs, while from runoff exacerbates algal blooms that smother seagrasses. These pressures are addressed through broader conservation efforts in the National Marine Sanctuary, which designates protected areas around Pigeon Key to safeguard and promote recovery.

Tourism and Education

Access and Visitor Experiences

Visitors can access Pigeon Key primarily via a 2-mile walk or bike along the restored section of the Old , which reopened to the public on January 12, 2022, connecting Marathon to the island. Alternatively, a rail trolley departs from the Pigeon Key Visitors Center at 1090 in Marathon (Mile Marker 47.5, near the historic Knight's Key station), with four daily departures year-round; private boats may also dock at the island's facilities. Tour options include guided historical walks lasting approximately 90 minutes, which provide narrated insights into the island's railroad-era structures and operations, followed by an hour of self-guided exploration using provided maps. Self-guided visits allow independent wandering across the grounds, while snorkeling excursions can be arranged in the surrounding waters, though participants must supply their own gear and follow catch-and-release fishing rules. On-site experiences emphasize relaxation and observation, such as lounging on the beachfront, amid , and photographing the remnants of the Seven Mile Bridge and historic cottages. To preserve the site's integrity, visitor capacity is managed through timed admissions and guidelines prohibiting access to restricted areas or disruptive activities. The island operates daily from 9:00 a.m. to 4:00 p.m., except on major holidays, with fees collected through the Pigeon Key Foundation—$30 for adults on guided tours (including island access), $25 for children aged 4-12, and free for those under 3; walk-in or boat arrivals incur separate admission fees starting at $15 per adult. Seasonal crowds peak during the winter months from November to April, when tourism surges in the , prompting visitors to book in advance.

Programs and Conservation Initiatives

The Pigeon Key Foundation, established in 1993 as a 501(c)(3) , oversees the management and preservation of the island, funding restoration projects through public donations to maintain its historic structures and natural habitats. The foundation's educational programs target K-12 students, emphasizing hands-on learning in marine science, railroad , and through summer camps and school field trips. Marine science summer camps, held weekly during the summer, engage participants in activities such as at nearby Sombrero Reef to explore ecosystems, dissections, and tidepool explorations, fostering an understanding of local and conservation needs. As of 2025, the programs include new initiatives led by a dedicated education coordinator. School field trips, customized for groups, incorporate guided tours of the island's historic railroad-era buildings alongside interactive sessions on and marine habitats, serving over 30,000 students from more than 1,000 since inception. Conservation initiatives led by the foundation include partnerships with the (NOAA) within the National Marine Sanctuary, where Pigeon Key serves as a designated Wildlife Management Area for monitoring and protecting species such as mangrove terrapins, salt marsh snakes, and nesting wading birds. To combat erosion exacerbated by , the foundation supports regional efforts involving installations and concrete pile placements along vulnerable shorelines near the island, as outlined in the Florida Keys Strategic Beach Management Plan. The foundation enhances community impact by hosting marine researchers who study coastal ecosystems and climate effects, while promoting through eco-focused tours that minimize environmental disturbance. Live webcams streaming views of the island's waters and enable virtual , allowing remote audiences to observe real-time ecological dynamics without on-site visitation.

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