Chart, Navigational
St. Clair River
One navigational chart entitled, "St. Clair River," that was compiled and published by the U.S. Lake Survey, Corps of Engineers, U.S. Army. The chart (No. 43) is a polyconic projection and is drawn at a scale of 1:40,000. It shows the St. Clair River from the lower end of Lake Huron to the St. Clair Flats. Land areas are shaded in pale yellow. Lake areas are shown in white and light blue depending upon water depths which are shown in feet. Distances are given in statute miles. Lines of latitude and longitude are shown in black. Course bearings are shown along with navigational range markers. Lighthouses and buoys are also noted. An enlarged inset chart is shown for the head of the river at Port Huron, Michigan, and Sarnia, Ontario.
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