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DETROIT RIVER. 67 channel, and 700 yards from lower end of shoal. Good water within 60 feet of the small pile wharf abreast the light-house ; the zero of the water-gauge on end of this wharf marks 16 feet of water at Lime-kiln crossing. Between this point and the upper Fight- ing Island buoy, the channel is one-quarter mile wide. Grassy Island light-house, N. 4 E., 24 miles. Kast Bank.--Red spar buoy in 114 feet of water. East side of channel, about midway between the two light-houses, and marks the outer point of the Fighting Island bank. It stands in 'soft bottom, with deep water close-to. In the bight of the chan- nel opposite, the range between the two light-houses serves as a channel-guide for a distance of two-thirds of a mile above and below this buoy. Grassy Island light-house, N. 4 W., 14 miles. GRASSY ISLAND LIGHT-STATION.--A fixed white light, varied by white flashes at intervals of one minute, 5th order, visible 113 miles. Cream-colored dwelling, with tower, 29 feet high, attached; stone foundation. On Grassy Island shoal, west side of channel. Stands at the elbow of the shoal, seven-eighths 'mile from upper end of shoal, and 500 feet from channel. Seven miles below Detroit, Michigan. Mamajuda light-house, 8, 4 'i 24+ miles. wee : Grassy Island.--Black spar buoy in 14 feet of water. Marks the elbow of the Grassy Island shoal. It stands abreast the light-house, in sandy bottom. The light-house range may be entered 600 yards above this buoy, and leads past the upper Fight- ing Island buoy, a little to the westward of mid-channel, The range between this buoy and Mud Island Shoal buoy just clears the head of Grassy Island shoal. Grassy Island light-house (upper side of new structure), W. 4 S., 500 feet. Fighting Island.--Red spar buoy in 114 feet of water. Marks the elbow of the flats at the upper end of Fighting island. It stands in soft bottom, with deep water close-to. This buoy, in range with Grassy Island light-house, just clears the flat between the buoy and the head of Fighting island. Grassy Island light- house (new structure), S. by W. + W., 1,600 yards. Mud Island Shoal.--Black spar buoy in 19 feet of water. Stands in sandy bottom at the southeast point of Mud Island shoal, and marks the west side of main channel, and north side of eastern entrance to a channel between Mud Island and Grassy Island shoals. Grassy Island light-house, 8. 3 E., 1 mile. The Detroit River, between Fighting island and Belle Isle, is free from obstructions. Belle Isle divides the river into two channels. The main channel is on the Canadian side. A shoal extends from the lower end of Belle Isle about seven-eighths of a mile, and is marked with a spar buoy. The main channel is free from obstructions until the east end of Belle Isle is reached, which