Sebastian Inlet

Sebastian Inlet is the manmade cut through the barrier island southeast of Sebastian that links the Atlantic Ocean with the Indian River Lagoon at the Brevard and Indian River county line.

Florida State Parks describes Sebastian Inlet as a manmade cut through the barrier island that connects the ocean with the Indian River Lagoon (Florida State Parks). The Sebastian Inlet District calls it one of only five navigable channels that connect the Indian River Lagoon to the Atlantic Ocean, and its FAQ adds that the Sebastian inlet is one of 60 inlets on the coast of Florida. For the county, it is the northern gateway: Indian River County describes its stretch of the lagoon as lying between Sebastian Inlet to the north and the Fort Pierce Inlet to the south (Indian River County Lagoon Division).

Land on both banks belongs to Sebastian Inlet State Park, and A1A crosses the water on the Sebastian Inlet bridge. That makes the inlet three things at once for the Sebastian area: a navigation channel for boats leaving the lagoon from Sebastian, Micco and Wabasso, the main exchange of ocean water for the lagoon in north Indian River County, and the center of the fishing and surfing coast east of the city.

The Sebastian Inlet District, an independent special taxing district created by the Florida Legislature in 1919, maintains the inlet channel, while the Florida Department of Environmental Protection runs the surrounding Sebastian Inlet State Park.

The district came out of a long local fight over the cut. Its history page dates the district to May 23, 1919, when voters approved the bill and the governor signed it, with a charter of maintaining the navigational channel connecting the Indian River and the Atlantic Ocean (Sebastian Inlet District history). Today that charter covers sand bypassing, channel dredging, beach and dune repair, the jetties, navigation markers and habitat monitoring around Sebastian Inlet (Sebastian Inlet District).

Property owners in both counties pay for it. For FY 2025-2026 the district set its rate at 0.1555 mills, which raised $7.56 million for inlet work, according to its FAQ. The board, its five elected seats split between Brevard and Indian River County, its budget hearings and its sand-placement record are covered on the separate Sebastian Inlet District government page. The district office is in Indialantic, but some board meetings are held at the Sebastian Fishing Museum inside the park; the district calendar lists one there on Nov. 11, 2026.

The beaches, catwalks, ramps and campground around the water are a state park matter. Sebastian Inlet State Park dates from 1971 and is operated by the Florida Department of Environmental Protection through the Florida Park Service, which sets park access and fees on both banks of Sebastian Inlet.

Sebastian Inlet's key figures, from the Sebastian Inlet District, are a 1,000-foot north jetty, a 575-foot south jetty, a 42-acre sand trap and a 3,120-foot channel to the Intracoastal Waterway.

Sand drives the schedule at Sebastian Inlet. Waves carry sand along the coast into the inlet, where it settles in the sand trap, a 42-acre underwater basin; Florida Tech surveys it twice a year for the district. Once roughly 200,000 cubic yards have collected, a dredge empties the trap onto the beaches south of the inlet, so bypass projects recur every four to five years. Boats bound for the lagoon use a channel of 3,120 feet to the Intracoastal Waterway, built to a minimum width of 150 feet and depth of 9 feet, with markers the district has kept up since 2007.

The money side is just as concrete. The district homepage describes Sebastian Inlet as a $1.1 billion driver of the regional economy, based on a 2023 study by the Balmoral Group, and the FAQ counts the surrounding state park among the most visited in Florida.

Sebastian Inlet reached its present location in June 1923 and has stayed open since 1948, after decades of failed hand-dug cuts north of Sebastian that sand and storms kept closing.

The Sebastian Inlet District history records that a cut known as Gibson's Cut appears on an 1880-81 survey map, and historians believe the first known attempt took place in 1872. At least six attempts were made by 1905, and all closed. After the district was formed, the inlet was once again opened in June of 1923 at its current location with small coquina jetties. A nor'easter closed it in 1941, and it stayed shut through most of World War II.

In 1948, using surplus U.S. Navy demolitions, district commissioners and local men blasted the inlet open again, and it has remained open ever since. The sand trap was excavated in 1962, and the bridge carrying A1A across the inlet opened on Feb. 27, 1965. The district notes that the Florida Department of Transportation will begin replacing the bridge in 2026. The full story of the digging is covered on the Cutting Sebastian Inlet history page.

Each working part of Sebastian Inlet has its own Digital Towns page: the Sebastian Inlet jetties, the Sebastian Inlet bridge, the sand bypass, the tides and currents, and the State of the Inlet reports.

The jetties page covers the 1,000-foot north jetty and 575-foot south jetty as fishing platforms and structures. The bridge page covers the 1965 A1A span and its replacement by the Florida Department of Transportation. The sand bypass page explains how the district moves sand from the sand trap to the beaches south of Sebastian Inlet under the Florida Beach and Shore Preservation Act. The tides and currents page covers the tidal flow through the inlet, and the State of the Inlet reports page covers the annual report the Sebastian Inlet District publishes with Florida Tech from its wave and weather gauges.

Sebastian Inlet feeds ocean water into the north Indian River County end of the lagoon and sits between two segments of the Archie Carr National Wildlife Refuge, so its waters, reef and shoals carry turtles, seagrass and fish.

The Sebastian Inlet District states that Sebastian Inlet sits between two segments of the Archie Carr refuge, which has the highest nesting densities of loggerhead sea turtles in the Western Hemisphere. The U.S. Fish and Wildlife Service describes that refuge as 20.5 miles of beach and shoreline habitat between Melbourne Beach and Wabasso Beach (U.S. Fish and Wildlife Service). Offshore, the nearshore hardbottom reef just south of the inlet is a grazing ground for juvenile green sea turtles, which the district says can spend up to the first two years of their lives there.

Inside the inlet, the district monitors seagrass beds in six zones on the western flood shoal, where the incoming tide drops sand into the lagoon. Restoration is under way nearby: in 2025, Indian River County staff and partners planted about 13 acres of seagrass at Big Slough near Sebastian Inlet, and 10 more acres at Preacher's Hole near the Wabasso Causeway, at sites chosen because they historically supported seagrass (NOAA Fisheries).