North America Lake and River St. Clair with the Detroit River From the latest United States Government Charts. All heights are expressed in feet above the level of the water. Magnetic Variation in 1895, increasing about 4' annually. All Bearings are Magnetic. Soundings in Fathoms --inset-- Port Huron [and Sarnia] ...
North America Lake and River St. Clair with the Detroit River From ...