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70 LAKE ERIE, island, S. 4 E., 24% miles. Green island light-house, N. W. % W., 1% miles. GREEN ISLAND LIGHT-STATION.--A flashing alternately red and white light, interval between flashes, 30 seconds, 4th order, visible 15 miles. Gray, square tower, 44 feet high attached to dwelling, lantern black. On the west end of Green island; a rocky, wooded island, 15 acres in ex- tent, one mile west of South Bass island; shores bold; shut in by woods from S. W. by W. by westward to N. W. by W. West end of Rattlesnake island, N. by E., 244 miles. West Sister island light-house, N. W. by W. % W., 14 miles. PORT CLINTON LIGHT-STATION.--A fixed red _ lens-lantern light, visible 8 miles, on the W. pier, about 20 feet from its outer end, at the entrance to Port Clinton Harbor. The light is visible from all points of approach from the lake. The focal plane of the light is 25-2/3 feet above mean lake level; octagonal lantern surmounting a_ square, pyramidal, wooden structure, with gallery at the top, on a platform on piles. The structure is white with brown foundation. Direction of pier, N. by E. % E. Green island light-house, N. by E. 15/16 E., 934 miles; West Sister island light-house, N. N. W. 11/16 W., 1734 miles. i Niagara Reef.--A black gas buoy (No. 5) in 17 feet of water, showing a fixed white light during periods of 10 seconds duration, separated by eclipses of 10 seconds. On the northerly side of a small reef with 7 feet of water on it and deep close-to, lying 1-1/6 miles south of the range between Green island and West Sister island light-houses. There is much foul ground between this reef and the south shore, and strangers should not attempt the passage on that side. Shoalest spot, southwest from buoy, 333 yards. North end of North Bass island, N. E. by E. % E., nearly 834 miles. . Green island light-house, E. S. E. % E., 554 miles. Northeast end of West Sister island, N. W. 5 W., 8% miles. WEST SISTER ISLAND LIGHT-STATION.--A fixed white light, 4th order, visible 15 miles. White, conical tower, 50 feet high, connected to dwelling by covered way; light 57 feet above lake level. On the south- west end of West Sister island; area of island, about 100 acres. A reef extends one-third mile from the southeast side of the island; bold, rocky shore on other sides. A red light shown from the station-in place of the usual white light, is to be understood as a distress signal. On N. E. side of island, the light is obscured by trees through an arc of about 1% points. Passing the island one-half mile to the southward, the course to Maumee straight channel entrance gas buoy is W. 34 N., 12 miles. Green island light-house, S. E. by E. % E., 14 miles. Turtle island light-house, W. ve N., 14% miles. MAUMEE BAY. Straight Channel, Maumee Bay, Lake Erie, Ohio. Twenty feet of water may be carried through this channel. Sailing Directions--This channel is dredged for 7%4 miles, in one straight reach, but the depth of water is unstable owing to the beach sand being lifted and scattered by the action of the waves during storms and by the silt brought down from ¢he river during freshets. | Through the entire length of the channel from the lake to the river a least width of 200 feet has been dredged to a depth exceeding 21 feet at mean level, including both turn-outs around the bay ranges. The plan is to deepen the channel to 21 feet for the full width of the anes 400 feet, from the lake to the Wheeling and Lake Erie Railroad ridge. \