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THOMPSON'S COAST PILOT. 47 GENERAL REMARKS. The shores of Thunder Bay are generally good holding ground. Excellent holding ground under the north point, in 34 to 6 fathoms and all along thenorth shore of the Bay. Good protection from all winds except SE. Good ane ree ony and sand, is oer to the north of Gull Island. : _ Note--McDonald's Bay, betiveen Thunder Bay and Sugar Island, can be entered from the north as well as the south; but it would not be safe for a stranger to try it from the north; as the chan- _ nel is not quite straight. The holding ground to the SW and south of the islands is not good, being rocky, but under the north point it is good. : There is a channel of 14 feet water between Sugar Island and the main shore. To pass through it from the south, bring north point to bear west ; distance 2 mile; and run due north till Gull Island is passed ; then haul up NNW for Middle Island. Note.--During the prevalence of easterly pales from north to south the water in the Bay is raised, and in like manner depressed { ) during westerly gales. 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 a mile. _ Off Indian Creek and White Rock Point, there are rocks and rocky spots within 4 a mile of the shore, which character continues to | Elm Creek, at which place a bad spit extends in a NE direction for 2 of a mile. There are several dangerous ledges running N and § about a mile from the shore, off Forest Bay; from thence to Point aux Barques Lighthouse. Bolders and rocky spots are found within 8 mile of the shore, from the Light to Point aux Barques, (proper.) There are ledges and detached rocky spots, rendering the coast dangerous, within 14 miles from the shore. There is a 4 foot spot 8 mile east, and a 9 foot spot 14 miles NNE of the Lighthouse. Orion Rock, with 6 feet water, lies 14 miles NW of Willow Creek