(Lake St. Clair Metropark, MI-50-23) in Harrison, Macomb County, MI. Metro Pkwy E. (curves S.) 0.8 miles from jct with Jefferson Av., go ½ way around roundabout & continue S. (curves E.) on Metro Pkwy 0.25 miles to the bldg on the S. side of the road. (N42 34.397 W82 47.696) Photo by Mark Comstock 8-11-23.