The center is the anchor attraction of the 500-acre Florida Conservation and Technology Center in Apollo Beach, on the southeast shore of Tampa Bay in south Hillsborough County, right next to Tampa Electric’s Big Bend Power Station. Parking and admission are free. Viewing is from boardwalks above the discharge canal; there is no swimming, wading or boating in the sanctuary.

When is the best time to visit the Manatee Viewing Center?

On a cold day between December and February. Manatees respond to water temperature, not the calendar. When Tampa Bay drops to about 68°F (20°C) or below, they move into the warm discharge canal, and the colder and longer the cold snap, the more of them pack in. The best visits come the morning after a cold front has pushed through, when the bay has had a night or two to chill and the canal surface is dotted with backs, snouts and tails. Tampa Electric’s own figures show what a cold winter can do: the center reported a record of about 1,100 manatees in the canal at one time in January 2024, beating the previous record of 850 set the winter before. Staff put the record down to a consistently chilly season. A local radio report on the same winter cited an aerial count by state wildlife biologists of about 1,180 animals, so the true peak may have been a little higher.

On warm days the picture changes. Manatees are not tied to the canal; they leave to feed on seagrass out in the bay and come back when the water cools. During a warm spell in the middle of winter you may see only a few animals, or none. Early November and late March to mid April, at either end of the season, are the most hit-and-miss. Check the forecast and plan your trip for a day or two after the coldest nights.

What are the manatees doing in the canal?

Mostly resting. A manatee in a warm-water refuge is saving energy: it lies near the bottom or hangs in the water column, rising every few minutes to breathe through the nostrils on top of its snout. That is why the canal can look like a field of grey boulders that occasionally move. The canal holds very little food, though. Manatees are plant-eaters that graze for five or more hours a day and eat roughly 4–10% of their body weight in wet vegetation daily, mostly seagrass in coastal areas. On mild afternoons many slip out into Tampa Bay to feed and return when the water cools again, which explains why numbers can swing so much from one day to the next. Manatees across the bay in Clearwater follow the same seasonal pattern.

Look for mothers with calves. A calf stays with its mother for about two years, and during that time it learns where to find warm water in winter and which routes to follow in summer. A female usually gives birth only once every two to three years, so each calf is a significant investment, and the winter refuge it learns at Big Bend may be the one it returns to for decades. Adults can reach about 10 feet long and 1,200 pounds, and the pale scars on many backs are records of past boat strikes.

Why do manatees gather at a power plant?

Florida manatees are big animals with a surprisingly low metabolic rate and little insulating fat, which limits them to warm water. Prolonged exposure to water below about 20°C (68°F) puts them at risk of cold stress syndrome, a chronic condition that can weaken the animal, damage its skin and gut, and eventually kill it. In winter they therefore crowd into warm-water refuges: natural springs such as Crystal River and Blue Spring, deep pools in rivers and canals that hold their warmth, and the heated outfalls of power plants. Our page on manatees and power plants explains how those outfalls became refuges.

Big Bend Power Station takes in bay water to cool its equipment and returns it to Tampa Bay clean but warmer. Manatees discovered this warm canal soon after the first generating units came online in the early 1970s and have used it every winter since. The canal is now a state and federally designated manatee sanctuary. Tampa Electric set aside a public viewing area in 1986, and the site has since grown into an education center with boardwalks, exhibits and a tower.

The cold threat is real, not hypothetical. A study by Stacie Hardy and colleagues examined winters from 2008 to 2014, including the unusually cold winters of 2009–10 and 2010–11, when manatees, sea turtles, fish and corals died across Florida. In central-west Florida, the region that includes Tampa Bay, reports of cold-killed manatees rose about a week after two-week periods of cold water. Young animals are especially vulnerable: in a review of 1,209 dead calves examined between 2009 and 2017, cold stress syndrome was the cause of death for 38% overall and was the leading killer of larger calves, the age when young manatees are learning where to spend the winter.

What happens to the manatees now the plant runs on gas?

Big Bend was built as a coal plant, with three units of about 445 megawatts each starting up in the early 1970s and a fourth unit added in 1985. In 2018 Tampa Electric announced a major rebuild of the station. Unit 2 was retired in 2021 after almost 50 years, and in 2023 Unit 1 was modernised into a natural gas combined-cycle unit of about 1,090 megawatts, ending coal use in that unit. Throughout the changes, the company kept the clean, warm-water discharge that feeds the sanctuary, so the manatees’ winter refuge has stayed open.

The bigger question is long term. Many warm-water refuges in Florida are artificial, and as old plants are replaced by more efficient ones or shut down, their outflows can disappear. Because manatees show strong fidelity to the winter sites they learned as calves, an abrupt loss of a major refuge could leave hundreds of animals searching for warmth in a cold snap. Natural springs face their own problems from groundwater pumping, reduced flow and nutrient pollution, and some historically used springs are blocked by dams. Conservation planners therefore treat both the protection of springs and the careful management of power plant refuges as part of manatee recovery. At Big Bend the warm water has been maintained through each round of modernisation, which is one reason this site remains so important for the Tampa Bay population.

Is the Manatee Viewing Center free?

Yes. Admission and parking are free, and the boardwalks meet ADA accessibility standards. Tampa Electric runs the center as a community and environmental education site. It reported nearly 500,000 visitors in 2023, typically draws about 400,000 a season, and has welcomed more than 7 million people since it opened in 1986. It has been a USA Today 10Best Readers’ Choice pick for best free attraction and has repeatedly received TripAdvisor Certificates of Excellence.

The season runs from November 1 to April 15. The center is open daily from 10 a.m. to 5 p.m., except Thanksgiving, Christmas and Easter, and closes early, at 3 p.m., on Christmas Eve. Pets are not allowed; only trained service animals are admitted. Tampa Electric recommends comfortable shoes and clothing, and in the coldest weeks, which are of course the best manatee days, a warm layer for standing on the open boardwalk.

What else is there to see on the campus?

The manatees are the main event, but the center is built to keep visitors busy for an hour or two. A 50-foot observation tower gives 360-degree views over Tampa Bay and the power station. A coastal habitat trail winds for almost a mile through wetlands, mangroves and estuary, and a 900-foot accessible walkway runs past native coastal plants. There is a butterfly garden, an education building with exhibits on manatees and Tampa Bay, and a touch tank where visitors can touch rays under the eye of staff. In the canal and the bay beyond, it is also worth watching for bottlenose dolphins, wading birds, pelicans and fish.

The campus is a partnership. Alongside Tampa Electric, the Florida Aquarium, the Florida Fish and Wildlife Conservation Commission (FWC) and the University of Florida are named partners in the Florida Conservation and Technology Center. The Florida Aquarium runs its coral conservation and research center in Apollo Beach, where in 2019 its team reported inducing a lab spawning of Atlantic pillar coral for the first time. The facility opened in 2016 and gained a 4,200-square-foot expansion in March 2024, bringing it to about 9,000 square feet of greenhouses and spawning labs; it holds what the aquarium describes as the largest living collection of Atlantic pillar corals in the world. The coral center is a working research facility and is not part of the free manatee visit.

How many manatees use the canal, and how do scientists know?

Over more than 20 years of records, about 190 individual manatees have been documented using the Big Bend canal, and one has returned for a record 42 years. Individual manatees are identified mainly by scars. Manatee scar tissue is white and lasts for decades, and most adult Florida manatees carry marks from boat strikes, so researchers can build a photo catalogue of known animals and follow them from winter to winter.

Counting a dense group in murky water is harder than it sounds. Animals underneath others are easy to miss, and individuals surface at different times. Aerial counts from planes remain the standard tool for winter aggregations, and FWC has run distribution surveys in Tampa Bay. Researchers are also turning to drones. In one study at warm-water canals in Collier County, a drone hovering for 10 minutes and recording 4K video allowed a capture-recapture analysis that corrected for missed animals; the highest estimate came in the cold winter of 2018, at about 158 manatees. Methods like these are making counts at sites such as Big Bend more reliable.

Are Florida manatees still endangered?

Their status has improved, but they are not out of danger. The West Indian manatee was listed as endangered in the United States in the 1970s, when only a few hundred were thought to remain in Florida. In 2017 the US government reclassified it as threatened, citing population growth, while keeping all federal protections in place. Late in 2023 the IUCN assessed the Florida subspecies as Vulnerable. The animals are also protected by the Marine Mammal Protection Act of 1972 and the Florida Manatee Sanctuary Act of 1978.

On Florida’s southwest coast, an integrated population model by Jeffrey Hostetler and colleagues estimated average growth of about 2% a year over roughly 20 years, though not steady: an unusual mortality event in 2013 cost an estimated 332 manatees in that region. Boat strikes remain the leading human cause of death, cold stress kills animals in harsh winters, and loss of seagrass from nutrient pollution has caused mass starvation on the Atlantic coast. Historical research adds a twist. A 2024 review of archaeological and historical records by Thomas Pluckhahn and David Thulman concluded that manatees were scarce in Florida in pre-colonial and colonial times and expanded across the peninsula in the nineteenth and twentieth centuries, partly because of human changes to the landscape. Warm-water sites like Big Bend are part of that modern story. Learn more about the species on our West Indian manatee page and its winter needs in manatee habitat.

How does Apollo Beach compare with other manatee sites?

Apollo Beach is the place for sheer numbers with no cost and no water time. If you want to get in the water, the natural springs of Crystal River are known for guided snorkelling near wild manatees, and Manatee Springs offers a quieter natural setting. Further south, Fort Myers has a similar power-plant site with kayak access.

Tips for a good visit

Arrive soon after opening on a cold morning, when the canal is often at its busiest and the light is soft. Bring polarised sunglasses: they cut surface glare and make the grey shapes under the water far easier to see. Stand still in one spot for a while rather than walking the whole boardwalk at once. Resting manatees surface to breathe every few minutes, and once your eye learns the shapes you will start to pick out mothers with calves, scarred backs and snouts breaking the surface. Never throw food or anything else into the canal; feeding or harassing manatees is illegal. If you are visiting with children, the touch tank and tower are easy add-ons, and the trail is short enough for most ages.