KETCHIKAN - The Southeast Alaska Power Agency is reporting a "pinhole" leak of water coming through the concrete of the spillway near the top of the Swan Lake Dam.
The agency says the small leak in the hydroelectric structure that serves Ketchikan is not a safety concern and does not reduce the dam's structural integrity.
The agency owns the dam that was built in the early 1980s near the head of Carroll Inlet about 25 miles northeast of downtown Ketchikan.
A powerhouse near the dam generates about 45 percent to 55 percent of the Ketchikan area's annual electricity supply.
The Ketchikan Daily News reports recent heavy rains have raised water levels in the Swan Lake Reservoir to near the 330-foot level, where water starts moving over the dam's spillway.