45° 20' 25" N/83° 29' 10" W. Radio: 9. Harbor Master on duty from May 15 - September 15 from 7am to 9pm. Off-season phone: (231) 627-9011. Amenities include restrooms, showers, electricity, water, pump-out, gasoline, diesel, launch, fishing pier, dog run and grills. The Portage Restaurant, a full-service eatery, is open from late April to early October from 11am to 10pm. The facility is open to the public and to harbor users. Seasonal slips are available. Please contact the DNR Cheboygan Field Office at (231) 627-9578. The Presque Isle State Harbor is a designated Michigan Clean Marina.