Swim Across America Tampa Bay

At the base of the St. Pete Pier, Spa Beach opens directly onto the calm, sunlit expanse of Tampa Bay. Here, Swim Across America Tampa Bay takes to the sea from the downtown waterfront of St. Petersburg, Florida, gathering open water swimmers along a protected urban shoreline. Established in 2012 by Swim Across America, this charity swim brings together athletes of all ages to test themselves against the tides alongside the landmark promenade. Swimmers can take on courses measuring half a mile, one mile, or two miles in the sheltered salt water. For younger participants under eight years old, the Dolphin Dash provides a fun, supervised swim right along the edge of the beach. Wetsuits are permitted in the water unless seasonal warmth pushes the bay past the event's thermal threshold.

Race morning at SPA Beach

Swim Across America Tampa Bay held its 15th annual open water swim on Saturday, May 9, 2026, at SPA Beach at the St. Pete Pier. Each year the swim draws more than 250 swimmers, volunteers, spectators and supporters, along with Olympian guests. Hundreds of swimmers of all ages entered the water for the 2025 swim. St. Petersburg sits on the Gulf of Mexico, where the average water temperature is typically around 76 °F (24 °C (75 °F)).

The St. Pete Pier: a century of overwater promenades

Long before modern swimmers stood on Spa Beach, the historic Railroad Pier pushed out into the bay in 1889, extending several thousand feet into twelve-foot-deep water. Overwater walkways soon multiplied along the downtown edge, from the 1,500-foot Brantley Pier in 1896 to the Electric Pier built in 1905, which stretched 3,000 feet into the waves and carried an electric trolley for passengers and cargo. A violent hurricane struck Tampa Bay in 1921, sweeping away the Fountain of Youth Pier and devastating the remaining timber pilings along the shoreline. Rather than retreat, the city rebuilt on an even grander scale, opening the Million Dollar Pier in 1926 with an expansive bathing beach and outdoor solarium constructed right at its base. That project established the municipal waterfront footprint where swimmers gather today. In subsequent decades, the pier site embraced bold experiments, including a 1976 laser art installation that projected a green beam bouncing off mirrors across the dark bay.

Tampa Bay: drowned river valley and sheltered estuary

The body of water supporting the swim has deep prehistoric origins. Tampa Bay formed roughly 6,000 years ago as a drowned river valley estuary, created when rising post-glacial sea levels connected an ancient freshwater lake directly to the Gulf of Mexico. Because of its origin as a submerged river basin, the bay remains relatively shallow, with an average water depth of approximately twelve feet over a bottom of soft sand and fine silt. Decades of targeted conservation culminated in 1990 when the Environmental Protection Agency designated Tampa Bay as an estuary of national significance. Today, those carefully protected waters provide a healthy home for more than two hundred species of fish. In cooler months, West Indian manatees seek shelter across the bay, often wintering around warm-water outfalls along the coast. Slicing through the surface on race morning, swimmers move through an estuary that has reclaimed its ecological balance.

Weedon Island and Jungle Prada: ancient mounds and landings

About twelve kilometres away, on the eastern shore of Boca Ciega Bay, the Jungle Prada Site preserves remnants of the Tocobaga tribe. A massive midden mound stands twenty-three feet high, measuring nine hundred feet long and three hundred feet wide, surviving from an ancient village complex that once stretched for over three miles. Today, the municipal park there offers a fishing pier and boat launch where visitors can look across the sheltered bay. About nine kilometres away along the western shore of Tampa Bay lies Weedon Island Preserve, where extensive shell mounds record early human habitation. In this coastal sanctuary of mangrove swamps and 1,100 acres of upland habitat, archaeologists unearthed an intact forty-foot dugout canoe estimated to be 1,100 years old, proving a long heritage of open-water navigation. Today, a four-mile paddling trail leads kayakers through shaded mangrove tunnels, while anglers fish from the pier at the edge of Weedon Drive.

Pinellas National Wildlife Refuge: the barrier island rookeries

Further out from the mainland, about thirteen kilometres away, the wild barrier islands of the Pinellas National Wildlife Refuge guard the southern rim of the peninsula. Established in 1951 to serve as a protected breeding ground for colonial bird species, this 394-acre reserve is accessible only by boat, keeping its mangrove canopies untouched by urban development. Together with Passage Key and Egmont Key, it forms a protective trio of national wildlife refuges guarding the mouth of Tampa Bay. The refuge spans several low-lying keys, including Indian, Mule, Jackass, and Tarpon Keys. Among the tangled branches and shallow sand spits, nesting colonies of herons, egrets, and cormorants gather each breeding season. Tarpon Key holds special importance as the host of the largest brown pelican rookery in the entire state of Florida.