An aerial view of the South Tampa waterfront on Old Tampa Bay: manmade finger-island neighborhoods of narrow filled land, houses and docks lining dredged canals with water on both sides.

Culbreath Isles, Tampa — the neighborhood dug out of Old Tampa Bay

The Ground Under
the Guard Gate

To build Tampa's first gated waterfront, the developers dredged Culbreath Isles up out of the bay — and cut the entrance channel straight through a village that had stood on this shore for five thousand years.

Local history from your neighbors at I Know A Guy AC

The first thing Culbreath Isles wants you to notice is that you can't get in. A guard sits in a booth behind a low concrete wall, and past him a single road runs out onto a handful of islands so tidy they look drawn rather than grown — a cul-de-sac finger, water on both sides, a dock behind every house. None of it existed when your grandparents were young. The islands are made of the bay itself: pumped up off the bottom of Old Tampa Bay a little over sixty years ago and shaped into some of the most expensive waterfront in the city.

But the channel you cross to reach that gate runs through something much older. To dig it, the men who built these isles bulldozed a set of mounds that people had been piling up on this shore for five thousand years. That's the strange thing about the ground under Culbreath Isles: it has been prime real estate for a very long time, and almost every owner has claimed it by erasing the one before.

An aerial of a hydraulic dredge operation: a dredge offshore pumps bay-bottom slurry through a pipe onto a raw, staked-out shoreline, building new land above the water.
Waterfront that had to be manufactured
A hydraulic dredge discharging fill to raise new land, 1968. Mississippi Department of Archives and History (Ingalls Shipyard West Bank Expansion Collection) — no known copyright restrictions. Shown to illustrate the dredge-and-fill method; not Culbreath Isles itself.

01 — before it had a nameThe people who built the mounds

Long before there was a Tampa to be south of, this shoreline belonged to people we know almost entirely by what they left in the dirt. Along this stretch of Old Tampa Bay they built low mounds — heaping up oyster and clam shell, bone, and broken tools over generations of living off an estuary that was, then as now, thick with fish. The oldest of it goes back somewhere between three and five thousand years, which puts the first residents of this address in roughly the age of the pyramids.

A hand-tinted circa-1900 view of a large Native American shell mound on the Tampa Bay shore, several people seated on its grassy slope, a house beside it.
A Tampa Bay shell mound — about 1900
"The Indian Shell Mound," St. Petersburg, circa 1900 — a Native American shell mound on the Tampa Bay shore, of the same mound-building culture whose middens stood on this site. State Archives of Florida, Florida Memory (PC4008) — public domain.

They were hunters and fishers of what archaeologists call the Archaic period, and they worked stone well enough that Florida's ancient spear points are still sorted, in part, by shapes made near here. One broad, cornered blade in the standard Florida typology is called the Culbreath point — and the patch of shore that named it, catalogued as the Culbreath Bayou site, sat just about where the neighborhood's entrance is now. A stone tool knapped on this bay four thousand years ago carries, today, the name of a man who would not arrive for another forty centuries.

A single chipped-stone Archaic-period projectile point resting on sand: a long, leaf-shaped white blade with a rounded stem, its surface covered in fine flake scars.
An Archaic-period Florida stone point of the kind recorded on this shore — the type named for this place is the "Culbreath."
A Thonotosassa-type stemmed point, Florida Archaic period (roughly 6000–3000 BC), a surface find — shown as an example of the era's stone tools, not the Culbreath type specimen. Photo: Mmacbeth — CC0, via Wikimedia Commons.

02 — the colonelA grove where the water is now

That man was Harry Culbreath. He came to Tampa in the late 1860s from South Carolina — a Confederate veteran leaving a home state the war had wrecked — and bought a long tract of bay shore for about a dollar and a quarter an acre, close to nothing for land close to nowhere. On it he planted oranges. Local histories credit him as the first to grow citrus on the Interbay Peninsula, and remember one exact habit: he set his trees in rows twenty-five feet apart, room enough to work between them, a spacing later growers copied.

An 1890s print of a Florida orange grove: rows of low, heavily leaved orange trees receding evenly toward a treeline.
A Florida orange grove — 1890s
"An Orange Grove Near Palatka, Florida," circa 1893 — a Florida citrus grove of Col. Culbreath's era, shown for the period (not the Interbay grove itself). From James W. Buel, America's Wonderlands (1893) — public domain, via Wikimedia Commons.

The grove gave the whole area its name. A tidal creek off the bay became Culbreath Bayou; a road became Culbreath; and eventually, so would the islands. But Culbreath never saw the islands, because in his lifetime they were still open water — grass flats and shallows off the end of his land, good for mullet and not much else. The single most valuable part of the modern neighborhood, the waterfront itself, had not been invented yet.

The most valuable part of the neighborhood — the waterfront itself — had to be manufactured.

03 — the dredgeHow you make an island out of a bay

Turning Tampa Bay into land was a Florida art form by the time it reached Culbreath's old grove, and the method was brutally simple. A dredge sat out in the shallows and sucked up the bottom — sand, shell, grass and all — then pumped the slurry through a pipe onto a staked-out shape until a new island rose, dripping, above the tide. Between the mid-1940s and the 1960s, developers around the bay used it to conjure whole neighborhoods of finger islands: strips of fill just wide enough for a road down the middle and a house on either side, so that every lot on both banks could be sold as waterfront.

A floating dredge at work in a Florida waterway in 1921, its boom and pipe throwing dredged spoil to one side to build up dry ground.
The machine that made the land — 1921
A dredge cutting the Tamiami Canal, 1921 — the same class of Florida dredge that pumped up bay bottom to build waterfront lots. State Archives of Florida, Florida Memory (RC06127) — public domain.

Next door, Beach Park had gone up on filled land in the 1924 boom. Culbreath's turn came in the 1960s, when developers — Joe Byars foremost among them — platted Culbreath Isles out of the bayou and the flats, dredged the canals that give the isles their fingers, and did one more thing that was new for Tampa: they walled it off and put a guard on it. Culbreath Isles is remembered as the city's first neighborhood to seal itself behind a round-the-clock gate and a concrete wall — fewer than two hundred houses, each with deep water at the back door and a single, watched way in.

A 1925 aerial of low natural islands and open shallows in Tampa Bay before any dredging — the raw grass flats and bay bottom that would be turned into land.
Bay bottom, before the dredge — 1925
Aerial of Big Island and Little Grassy Island before dredging began for Davis Islands, Feb. 4, 1925 — the kind of open bay shallows that became finger-island neighborhoods. Burgert Brothers Collection, USF Libraries — No Copyright, United States.
A 1927 aerial of the same Tampa Bay water now built into land: winding new roads and scattered buildings on freshly dredged-and-filled islands, downtown Tampa on the horizon.
The same water, made into land — 1927
Aerial of partially developed Davis Islands, looking north toward downtown Tampa, June 12, 1927 — Tampa's landmark 1920s dredge-and-fill neighborhood, the model Culbreath Isles followed a generation later. Burgert Brothers Collection, USF Libraries — No Copyright, United States.

04 — what it costThe channel through the mounds

To open the isles to the bay, the dredge had to cut an east–west channel at the entrance — and that channel ran straight through the old mounds. They were excavated and then destroyed, the five-thousand-year-old shell heaps carried off as fill and spoil so the boats could pass. What survived did so almost by accident: the distinctive points and tools pulled from the ground in those years went into the record instead of into the water, which is how a vanished village on a dredged-away mound ended up with its name stamped onto a page of Florida archaeology.

The bay paid, too. Every finger island was a patch of grass flat buried under fill, and across Tampa Bay the dredge-and-fill boom smothered the shallow turtle-grass meadows the fish — and the mound-builders before them — had lived on. By 1970 the reckoning came: a federal court, ruling on a Tampa Bay dredging fight, held that the government could weigh the cumulative damage of filling an estuary at all — and the era of manufacturing waterfront out of open bay effectively ended. Culbreath Isles had made it in just under the wire.

A 1969 aerial over Hooker's Point in Tampa, a broad peninsula of dredged-and-filled land pushing out into Tampa Bay, ringed by channels.
Another peninsula pulled from the bay — 1969
Aerial looking north over Hooker's Point, Tampa, circa 1969 — a dredge-and-fill peninsula built out of Tampa Bay, made in the same years as Culbreath Isles. State Archives of Florida, Florida Memory (K025653) — public domain.
3,000–5,000 yrs agoArchaic mound-builders live and fish on this shore
late 1860sCol. Harry Culbreath buys the bayfront (~$1.25/acre) and plants oranges
1924Neighboring Beach Park is platted on filled land
1960sByars plats Culbreath Isles, dredges the canals, walls the gate
1970A Tampa Bay court case helps end the dredge-and-fill era

05 — what's leftThe address that keeps being claimed

Drive the neighborhood now and the layers are all still there if you know to look. Culbreath Bayou is still on the map — a real tidal creek carrying the colonel's name into a bay he bought for pocket change. The isles he never saw are among the most valuable ground in Tampa, deep-water docks lining canals that are themselves only sixty years old. The grove is gone; the mounds are gone; the grass flats are mostly gone. The stone point remains — in a museum drawer and a typology — the one resident of this shore whose name outlasted everything built on top of it.

A present-day view of the grassy Madira Bickel temple mound on Terra Ceia Island in lower Tampa Bay, a raised earthwork among tall palms with a footpath running past it.
What was lost here still stands at Terra Ceia
The Madira Bickel Mound, Terra Ceia Island, lower Tampa Bay (present day) — a surviving temple mound of the same regional mound-building culture whose mounds on this site were destroyed to cut Culbreath Isles' entrance canal. Photo: Paul R. Burley, 2020 — CC BY-SA 4.0, via Wikimedia Commons. Modern photograph.

The guard at the gate is keeping people off a piece of ground that has been worth guarding for five thousand years. He is only the latest to try. Everyone who ever wanted this shoreline got it the same way — by clearing off whatever the last owner had loved about it — and then, in turn, was cleared.

The wall is new. The habit is very old.