Hurricanes Flood Florida's Lake Okeechobee, Experts Fear Long-Term Problems
ON THE WATERS OF LAKE OKEECHOBEE, Florida Standing on an airboat, state biologist Donald Fox surveyed the dying, bare stalks peeking out of the coffee-brown lake water.
This past summer, the vegetation here was lush enough to conceal a boat of duck hunters, Fox said, the result of four years of intense conservation efforts. But four hurricanes in six weeks shredded the plants and left the water several feet too high, chasing off small wading birds, who need shallow water to forage for food.
"Basically, we're back to square one," Fox said. "It was very devastating."
Lake Okeechobee felt the effects of all four hurricanes that swept over Florida in August and September. It took direct hits from Frances and Jeanne; a near hit from Charley, which drenched the Kissimmee basin that drains into the lake; and was soaked again by the remnants of Ivan.
The second largest freshwater lake within the contiguous United States behind Lake Michigan, Okeechobee is critical to the health of the Everglades and is commonly known as the state's "liquid heart."
The same winds and rain that left at least 83 people dead in Florida and caused an estimated $18 billion (euro14 billion) in insured losses ravaged the lake. Winds at least 79 mph (127 kilometers per hour) and devastating storm surges left the shoreline littered with carcasses of alligators, fish, and birds.
The storms flooded the lake's tributaries, which caused its level to rise about a foot (30 centimeters) a week from 12.8 feet (3.9 meters) before Charley, which hit southwestern Florida on Aug. 13, to a crest of just over 18 feet (5.5 meters).
The combined effect of flooding and other damage could wipe out an entire generation of the lake's prized game fish black crappie and large mouth bass, Fox said. Sport fishing brings in $100 million (euro78 million) annually to the economically depressed area.
"The worst thing that can happen for the environment in this area is what happened," said David Bogardus, a field officer for the World Wildlife Fund.
Lake Okeechobee is surrounded by the 143-mile (230-kilometer) Herbert Hoover dike, which was built in the 1950s in part to prevent another disaster such as the 1928 hurricane, when flooding and storm surge from the lake killed more than 2,000 people.
But the dike also prevents the lake from expanding into its natural flood plain. Instead, the water level rises, drowning plants that provide a habitat for fish and stabilize the lake bottom.
The lake was intentionally kept at a higher level, around 16 feet (5 meters), throughout most of the 1990s because it was used for flood control and as a backup water supply for heavily populated southeastern Florida.
That killed much of the bulrush, hydrilla, eelgrass, and other plants, to the detriment of the game fish. After four years of conservation efforts which began with lowering of the lake level the plants were recovering.
"It's kind of like building a pasture," Fox said. "You put the grass on it before you put the cows on it."
As a result, the fish and bird populations were rebounding, including endangered species such as the snail kite bird.
"Things were just getting perfect," Fox said.
Then the hurricanes hit, the water level rose again, and the storms churned up sediment and phosphorus on the lake bottom, which make the water a thick muddy brown and block light to vegetation below.
Many plants were ripped up and left in the lake to rot, and some are decomposing underwater. The air smells of methane, like a dairy barn, and the water is thick like stew.
No plants or animals who need oxygen can live there, Fox said, and it could take months or years to recover.
Source: Associated Press