ST. JOHNS BAY JAMES ISLAND, 491 



high, lying" 300 yards to the westward. Shoal water extends about 

 300 yards off this shore in places, and there is a patch with 5 fathoms 

 of water over it at 600 yards offshore and bearing 77°, distant 1^ 

 miles from Lower Sandy point. 



Southern passage, between the southern end of Thwart island 

 and the mainland to the southward, is 1,200 yards wide, but it is 

 obstructed by shoals extending from both sides, and by a patch, with 

 2 to 3 fathoms water over it, lying in the fairway, and leaving only 

 two narrow channels having depths of 4^ and 5^ fathoms. 



Tidal streams. — Usually in Southern passage the flood stream 

 sets west-southwestward and the ebb east-northeastward, but their 

 directions and rates depend much on the wind. With strong north- 

 erly to easterly winds the rate of the west-going stream increases, and 

 at springs reaches 2 knots; also, at many times, it overcomes the east- 

 going stream and continues westward for man}" hours. With strong 

 westerly winds the reverse is the case. 



The southern shore eastward of the Southern passage trends 

 east-southeastward for 3 miles to the western entrance point of Mi- 

 lord arm ; included in this stretch is Browns arm, a shallow bight. 

 Bearing 312"^, distant 700 yards from the western entrance point of 

 Browns arm, is a patch with 27 feet of Avater over it, and bearing 50°, 

 lx% miles from the same point and 400 yards offshore, is an islet 100 

 feet high. Shoal water extends from 200 to 700 yards off this shore. 



St. Johns bay lies eastward of Thwart island ; it contains several 

 small islands with passages between them, the navigation of which 

 requires local knowledge. 



Islets. — An islet 20 feet high bears 233°, distant 550 yards from 

 the southeastern point of the islet, 210 feet high on western side of 

 the approach to Thwart Island harbor, and an islet 55 feet high 

 bears 203°, ^ mile from the same point. From a point I mile east- 

 southeastward from the southern point of the western approach to 

 Thwart Island harbor, three islets extend south-southeastward 1,200 

 yards; these islets are 75, 80, and 100 feet high, respectively; there 

 is foul ground between them, and a rock with 7 feet water over 

 it lies 100 yards north-northwestward of the northern islet, while 

 there are depths of 27 to 30 feet at 600 yards westward of the southern 

 islet. 



Frying Pan island, southeastward of the conical hill 400 feet 

 high, situated eastward of St. Johns harbor, with a clear passage 300 

 yards wide between, is 700 yards long, northward and southward, 100 

 yards to 400 yards wide, and 240 feet high; its coasts are steep-to. 

 A small islet, 83 feet high, lies 200 yards east-southeastward of its 

 summit. 



James island, 400 yards northeastward of Frying Pan island, 

 is 400 yards long, northward and southward, less than 200 yards 



