September 19, 2002 at 4:42 PM EST - Updated July 1 at 8:20 AM
AKRON, Ohio (AP) - Lake Erie was on its way back, but it might be dying again.
American and Canadian scientists are studying the lake, trying to figure out why a large "dead zone" has occurred between Sandusky and Erie, Pa.
Phosphorous levels in the lake are on the rise -- a problem that existed in the 1960s. Phosphorous levels have been rising since 1995.
Jeffrey Reuter of Ohio State University said that if they continue to rise, the lake could face problems. The phosphorous could lead to dead fish and threaten Ohio's walleye fishing and Lake Erie tourism.
U.S. Environmental Protection Agency scientist David Rockwell said that it's a serious problem and that the brakes thought to be in place aren't working anymore.
(Copyright 2002 by The Associated Press. All Rights Reserved.)