Apalachicola River Watershed

The Apalachicola River starts at Jim Woodruff Lock and Dam on Lake Seminole, where the Chattahoochee and Flint rivers meet, (USACE Mobile District), and the river system ends in Apalachicola Bay, Florida (USACE ACF River System).

Lake Seminole sits in the southwest corner of Georgia on the Florida line. The Corps describes it as a 37,500-acre lake with 376 miles of shoreline, and the river leaves it through the Jim Woodruff Lock and Dam (USACE Lake Seminole). The Apalachicola River and Bay watershed is the southern extent of the Apalachicola, Chattahoochee and Flint (ACF) basin, which extends north to the Appalachian Mountains (NWFWMD).

Official figures for the size of the ACF basin differ. The Northwest Florida Water Management District says the ACF basin covers approximately 21,000 square miles of Alabama, Georgia and Florida (NWFWMD). The Corps of Engineers says the basin covers 60 counties in Georgia, 10 counties in Alabama and 8 counties in Florida, extends approximately 385 miles and drains 19,600 square miles (USACE ACF River System). The Corps adds that the basin originates in northeast Georgia, crosses into central Alabama and follows the state line south to Apalachicola Bay (USACE).

Inside Florida the watershed takes in the Chipola River, the New River and the Carrabelle River, and its estuarine waters include Apalachicola Bay, East Bay, St. George Sound, St. Vincent Sound and Alligator Harbor (NWFWMD). The Apalachicola National Estuarine Research Reserve sits largely in Franklin County, with its boundary stretching into Gulf and Liberty counties (Florida DEP).

The Apalachicola is Florida's largest river, the fifth largest entering the Gulf of Mexico and 21st in flow volume in the United States, and it has the largest forested floodplain in Florida (NWFWMD).

Florida DEP describes the Apalachicola River and Bay drainage basin as the river with the largest flow, the most extensive forested floodplain and the most productive estuary in Florida (Florida DEP ANERR). DEP adds that over 95% of commercially harvested species and 85% of recreationally harvested species in the open Gulf spend a portion of their life cycle in estuarine waters like Apalachicola Bay.

The state and federal designations stack up over five decades. Florida named Apalachicola Bay one of 18 aquatic preserves in 1970. In 1979 NOAA designated the lower river and bay a National Estuarine Research Reserve, and Florida designated the lower Apalachicola River an Outstanding Florida Water the same year, adding the upper river in 1983. UNESCO named the reserve a Biosphere Reserve in 1984 (Florida DEP).

Large public landholdings protect much of the Apalachicola corridor. The water management district lists the Apalachicola National Forest, St. Vincent National Wildlife Refuge, several state parks, the Apalachicola River Water Management Area, the Apalachicola Bluffs and Ravines Preserve, Tate's Hell State Forest and the Apalachicola Wildlife and Environmental Area (NWFWMD). FWC's Apalachicola River WEA covers the lower river and floodplain from Apalachicola Bay north to Liberty County and more than 280 bird species may be found there (FWC).

No single agency runs the Apalachicola watershed: the Corps of Engineers operates the dam and navigation channel, the Northwest Florida Water Management District runs the Apalachicola River and Bay SWIM plan, DEP runs the estuarine reserve and FWC manages oysters and wildlife lands.

The Corps describes the ACF navigation system as a channel 9 feet deep and 100 feet wide from the mouth of the Apalachicola River to Columbus, Georgia, and Bainbridge, Georgia, a 290-mile waterway with a 190-foot lift through 3 locks and dams (USACE). Congress authorized the Jim Woodruff Lock and Dam Project in the Rivers and Harbors Act of 1946, and construction was complete by 1952 (USACE Lake Seminole).

The water management district calls the ACF basin the highest priority of its SWIM program, and its Apalachicola River and Bay SWIM plan is focused on actions that can be taken within Florida (NWFWMD). Its project list includes stormwater retrofits, septic tank abatement, agriculture and silviculture best management practices, sedimentation abatement, riparian buffer zones, estuarine habitat restoration and strategic land conservation.

The Apalachicola National Estuarine Research Reserve covers 234,715 acres and includes the lower 52 miles of the river and floodplain and most of Apalachicola Bay; DEP notes that about two thirds of that acreage is submerged bottomland (Florida DEP).

Apalachicola Bay oysters collapsed in 2013, harvest was shut from 2020, and FWC reopened the bay on January 1, 2026 (FWC news release); a second season for permit holders opened October 1, 2026 and runs to February 28, 2027 (FWC).

The scale of the loss explains the long closure. At its peak, Apalachicola accounted for approximately 90% of Florida's commercial oyster landings and about 10% of the commercially harvested wild oysters sold in the United States (FWC news release, Dec. 31, 2025). After the 2013 collapse FWC issued 20 executive orders to cut harvest pressure, closed harvest by executive order in 2020 and followed with a five-year closure beginning in 2021. FWC reports that over $38 million has been invested since 2019 in projects to restore a sustainable oyster industry.

The November 2025 Commission meeting approved a revised Apalachicola Bay oyster management plan with annual seasons based on oyster abundance. The January 1 to February 28, 2026 opening was the first opportunity to harvest from the bay since 2020, and approved commercial endorsement holders shared roughly 4,700 bags (FWC). FWC said in December 2025 that the restored reefs were the only locations in the bay with oyster abundance that could support harvest.

Under the new rules a reef opens only if it meets the ecological threshold of 400 bags of legal-sized oysters per acre, harvest days are Monday through Friday, and one bag equals two 5-gallon buckets, one 10-gallon bucket or 60 pounds (FWC commercial oyster rules). Commercial harvest requires a Saltwater Products License, a Shellfish Endorsement and an Apalachicola Bay (AB) Endorsement, and FWC says no new AB Endorsements will be issued after the January to February 2026 season.

Recreational harvest in Apalachicola Bay also needs a permit. Harvest opened to Apalachicola Bay Recreational Opportunity (ABRO) Permit holders on Oct. 1, 2026; applicants must be Florida residents with a recreational saltwater fishing license, and the application window is July 15 to 31 each year through GoOutdoorsFlorida (FWC recreational shellfish rules). The application period for the 2026 to 2027 season closed July 31, 2026; FWC offered 127 ABRO permits for that season and selected permit holders and harvest reefs by lottery. Last verified: October 15, 2026, on the FWC website.

The main pressure on the Apalachicola system is freshwater flow: DEP says rising upstream water use around metropolitan Atlanta and agriculture in the watershed has added pressure to reduce freshwater flows into Florida and Apalachicola Bay (Florida DEP ANERR).

The Corps operates five federal reservoir projects as parts of the ACF system, from Buford Dam (Lake Lanier) down to Jim Woodruff Lock and Dam (Lake Seminole), and says that during drought its operations in support of navigation and hydropower may become very limited. The Corps lists water supply, hydroelectric power, flood control and recreation among the purposes of the ACF system, alongside navigation (USACE).

Inside Florida the water management district says continuing water quality challenges call for better stormwater treatment, best management practices for agriculture, silviculture and construction, improved wastewater treatment and long-term protection of critical habitats and buffer areas. Its SWIM plan project list includes stormwater planning and retrofit, septic tank abatement, advanced onsite treatment systems, basinwide sedimentation abatement and a comprehensive monitoring program (NWFWMD SWIM plan).

Because of growing development pressures, Florida designated Franklin County an Area of Critical State Concern in 1985; by 2011 the designation had been removed from all of Franklin County except the city of Apalachicola (Florida DEP). One practical note: the two official basin sizes (about 21,000 square miles from the district and 19,600 square miles from the Corps) are both in current use, so any figure quoted for the Apalachicola watershed should name its agency.

The easiest start is the Apalachicola National Estuarine Research Reserve Nature Center at 108 Island Drive in Eastpoint, open 9 a.m. to 4 p.m. Tuesday through Saturday, with parking on site (Florida DEP ANERR).

The Eastpoint center has exhibits on the Apalachicola River and Bay, restrooms and the Estuary Walk boardwalk; a second boardwalk, Woody's Walk, sits at the Mill Pond in Apalachicola at the old headquarters. DEP notes that many points in the reserve can be reached only by boat, because about two thirds of the acreage is submerged and roads do not exist in many floodplain areas (Florida DEP).

Public boat ramps around Apalachicola Bay include Indian Creek Park, Patton Drive, St. George Island, Seafood Landing Park, the John B. Meyer Harbor House (Mill Pond) ramp and the Henry Abercrombie Jr. (Pine Log) ramp. Battery Park in Apalachicola charges non-Franklin County residents $10 per day, and the shallow sand ramp inside Dr. Julian G. Bruce St. George Island State Park costs $6 per day (Florida DEP).

Upriver, the Apalachicola River WEA offers hunting, fishing and miles of paddling trails along the river (FWC). At the head of the Florida river, Jim Woodruff Lock is open by appointment only, scheduled by calling 850-663-4692, and the Lake Seminole project lands add more than 22,000 acres for boating, camping and fishing (USACE).