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62 THOMPSON'S COAST PILOT. Norr.--Dnuring the prevalence of easterly gales from north to south the water in the Bay is raised, and in like manner depressed during westerly gales. we DANGERS ON LAKE HURON. From Fort Gratiot to Point aux Barques Lighthouse, the coast as far as Blue Ledge can be approached within a quarter of amile. Off Indian Creek and White Rock Point there are rocks and rocky spots within 4 a mile of the shore, which char- acter continues to Elm Creek, at which place a bad spit extends in a NE direction tor ? of a mile. There are several dangerous ledges running N and 8 about a mile from the shore, off Forest Bay; from thence to Point aux Barques Lighthouse. Boulders and rocky spots are found within ¢ of a mile of the shore, from the Light to Point aux Barques (proper). There are ledges and detached rocky spots, rendering the coast dangerous, within 13 miles from the shore. There is a 4 foot spot % of a mile east, and a 9 foot spot 14 miles NNE of the Lighthouse. Orion Rock, with 6 feet water, lies 12 miles NW of Willow Creek wharf. Bad Ledge extends ¢ of a mile from NW to NE from Burnt Cabin Point. Point aux Barques Reef (proper) extends NW 1¢ miles. From Point aux Barques (proper) to Sauble Point Flat, off Port Austin wharf, + amile to the NW. Shoal ground off Flat Rock Point, extends out 4 a mile, and continues out this dis- tance along the coast to Partridge River. Two shoals 23 miles from shore, off Partridge River; good water inside of them. Spit from Hat Point extends 1 mile to the northward. There is a shoal spot 13 miles WNW from Little Oak Point. Foul ground around the Charity Islands, extending 12 miles to the northward, and 12 miles to the eastward of the Lighthouse. A flat extends for 1 mile to the westward of the Big Charity Island ; and there is a rocky spot 14 miles SE of Little Charity Island. A sand bank with 10 feet water, extends from Little Charity to the main land, and a sand spit puts out from Sand. Point in a NW direction, for 14 miles, with 1 foot least water