BALTIMORE (AP) - Maryland Natural Resources Police say a large swath of the Potomac River is too dangerous for recreational use because of high water levels.

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Police issued an advisory Thursday asking boaters, swimmers and other recreational users to stay out of the Potomac through Oct. 4. The affected area stretches from Cumberland in western Maryland to Great Falls in the Washington suburbs.

Sgt. Art Windemuth of the Natural Resources Police says there's too much debris in the river and the water is moving too fast for swimming, boating, tubing and other recreational use.

The warning doesn't apply to whitewater trips with professional guides.