The commission late Thursday gave state fisheries officials permission to impose catch-and-release only fishing below the Big Springs Trout Hatchery.
But officials were still determining how far down the 31-mile stream the regulations would be imposed, with a final decision expected sometime next week, department spokesman Ron Aasheim said Friday.
State regulators last summer found high levels of PCBs in sediments just downstream from the fish hatchery. Subsequent tests this fall found that levels of PCBs in rainbow trout and brown trout just below the hatchery exceeded the recommended level for human consumption.
The original proposal called for imposing catch-and-release regulations on a 7-mile stretch of the creek from the Ash Street Bridge in Lewistown to the headwaters of the creek; and also the East Fork of Big Spring Creek up to the base of the dam, said Chris Hunter, chief of fisheries.
Officials believe the PCBs likely came from paint that was used on portions of the fish hatchery decades ago.
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