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90 _ DETROIT RIVER. Channel Between Mamajuda Shoal and North End of Grosse Isle, Standing South. | Sailing Directions--From the west channel of the river, round the Grosse Isle Spit buoy, about 100 feet to the northward and eastward, and steer for the Mamajuda Range Rear light-house until the north point of Grosse Isle bears abeam, when haul in for the Grosse Isle shore, and follow it down, at a distance of from 450 to 600 feet, past the lower end of Mama- © juda shoal, into the main channel. The lower end of Mamajuda shoal lies oposite the lower end of the deep bight of the Grosse Isle shore, just be- low the fish pond. This channel is about 1% mile long and 500 feet wide; sandy bottom. Channel Between Grassy Island | Shoal and Mud Island Shoal, Standing Down Stream. Sailing Directions--From the main channel of the river pass south of and near the Mud Island Shoal buoy, and steer S. W. There are no good ranges for running this channel or the channel west of Mud island, though there is 18 feet of water in the former, and more in the latter. During the summer months, grass grows on the surface of the water very close to the channel, at the foot of Mud island. This channel is about 2/3 of a mile long and 500 feet wide; sandy bottom. ~ Standing Up the Detroit River, Above Fighting Island. Sailing Directions--The Detroit river between Fighting island and Belle Isle is free from shoals. Belle Isle divides the river into two chan- nels; the main one--which is on the Canadian side is about 1,800 feet wide, and the other--on the Amercan side--is about 600 feet wide in its narrowest part. Off the southwest end of Belle Isle, a shoal extends 7% of a mile, the end of which is the dividing point of the channels, and is marked by a spar buoy. The Canadian channel is free from obstructions until the southeast end of Belle Isle is reached, which can be passed close- to; then by bringing it over the stern or slightly on the port quarter, and steering on Windmill Point range, the course will lead fair between the shoal extending to the eastward of Belle Isle and the one to the westward of Isle aux Péches, the ends of which are marked by spar buoys. In the American channel, between Belle Isle and the mainland, there is a bridge connecting the city with Belle Isle, having a draw that, when open, gives two ships passageways 125 feet wide each. The signal to open the draw is three blasts of the whistle or fog horn. There is also a shoal--Scott middle ground--extending in a northeast and southwest direction 134 miles which is marked on its northern and western sides by three buoys. In using the American channel, leave the buoy on the southwest end of Belle Isle on the starboard hand; keeping in mid-channel or nearer to the shore, pass through bridge draw and to the northward of the buoys on Scott middle ground, and when the upper buoy, No. 6, is reached, haul up | for Windmill Point light-house, until past the north point of Belle Isle and in mid-channel, when steer E. 1% S. with the N. point of Isle aux Péches, a little open on the starboard bow, until the range of Belle Isle and Windmill Point light-houses is past, when haul up the river, keeping Windmill Point shore best on board to clear the flat off Isle aux Péches and, when abreast of Windmill Point light-house, steer for the lower en- trance Gas Buoys Nos. 1 and 2 at the southern entrance of the 20-foot channel, which commences at a point 1%4 miles E. N. E. of Windmill point and runs N. E. % E., about 63g miles, where the natural depth of the lake is again found sufficient. From the lower entrance or southern entrance