Lake Okeechobee Discharges

Franklin Locks

Harmful Discharges

Lake Okeechobee is often referred to as the “liquid heart” of Florida. Unfortunately, over the years, the Lake has become heavily polluted by run-off from agriculture and development in Central & South Florida.

As it was designed in 1947 to avoid flooding south of the lake, the Caloosahatchee and St. Lucie rivers are the two “safety valves” of the system during high water events. Water from Lake Okeechobee is now routinely discharged to these rivers and sent to tide in the Gulf of Mexico and Atlantic Ocean. This practice is also starving Florida Bay of the freshwater it naturally received through the historic Everglades.

In the wet season, massive amounts of nutrient polluted water is now being sent to the Caloosahatchee River. This nutrient rich water is exacerbating harmful algal blooms of increasing scope and frequency.

The federal Army Corps of Engineers is responsible for the Lake’s operation. The Corps’ operational manuals consider public safety and many other objectives set forth by the state’s South Florida Water Management District.

Minimum Flows & Levels

To complicate matters for the Caloosahatchee, our brackish water estuary thrives with a certain amount of freshwater sustaining Vallisneria tape grass near Fort Myers. When dry season rainfall is not enough to suppress salinity levels, tape grass die-offs occur.

As a result of these two seasonal swings, and water mismanagement by government agencies, the Caloosahatchee often suffers from too much freshwater in the wet season, and not enough freshwater in the dry season.

Franklin Lock spillway

Useful Links

Lake Okeechobee Status

Lake O Satellite

There are a number of tools we use to gather information about the current status of harmful algal blooms on the Lake, as well as the flows being overseen by water managers. Here are a few of the best:


Related News Stories

Lake Okeechobee

Make Your Voice Heard: Oppose SB 2508

Florida Senate bill 2508 surfaced out of nowhere on Friday, February 4th. The bill was fast-tracked skipping the usual committee stops and following another unexpected announcement by the South Florida Water Management District, requesting control of an additional 1.5 feet of Lake Okeechobee above the Water Shortage Band as part of LOSOM.

Critics ‘Not Totally Sold’ on Army Corps’ New Plan for Lake Okeechobee Releases

Dozens of scientists, environmental groups, elected officials and agency heads met to talk about recent changes to a still-controversial plan to govern Lake Okeechobee releases. Paul Gray, Audubon Florida’s director of science, offered a cautionary tale about becoming strictly wedded to policies that don’t necessarily make ecological sense.

Make a Donation

Get Notified

Priority Issues

Marina 1 alt

Harmful Algal Blooms

Cyanobacteria & Red Tide

Cyanobacteria (blue-green algae) and Karenia brevis (red tide) have been making major impacts on Southwest Florida.


Lake Okeechobee Discharges

Revise System Operating Manual

The Caloosahatchee River often suffers from too much freshwater in the wet season, and not enough freshwater in the dry season.

Chiquita Lock

Cape Coral Spreader Canals

Nutrient & Sediment Loading

The City of Cape Coral is working to remove large storm-water barriers to make recreational boating more convenient.

Bacteria Monitoring

Fecal Indicator Bacteria

Calusa Waterkeeper has been at the forefront of monitoring this Fort Myers tributary for fecal bacteria indicators.