(Triangle Educational Services, MI-53-02) N. of Pentwater (Oceana County), Summit Township, Mason County, MI. Bus.US31 N. (curves E.) 3.4 miles from jct with 1st St. in Pentwater, N. on Pere Marquette Hwy 2.1 miles to the house at 6021 up a driveway 0.15 miles. (N43 50.872 W86 24.125) Photo by Mark Comstock 12-27-04.