Tanaga Pass
Encyclopedia
The Tanaga Pass is a strait between Tanaga Island
and the Delarof Islands
the Aleutian Islands of Alaska
. It is about 40 miles long and 13 miles wide at its narrowest part. Tidal currents commonly range between 2 and 3 knots in the pass.
From the U.S. Coast Pilot: "Depths of 50 fathoms or more can be carried through the pass by keeping 6 miles off Cape Amagalik, Tanaga Island, and 3 miles off the Delarof Islands.
"The direction and velocity of the current is radically affected by the land areas and the banks. It appears that the flood is diverted by the chain of islands – Skagul to Unalga – and the relatively shoal water between them to an E and W direction in moving around this chain. It was observed that S of Skagul Island the flood sets about NE, E of this island it sets N, and N of the island it sets N to NW.
"With erratic currents of this nature, dead reckoning cannot be depended on and the navigator may find his vessel 1 mile or more off his reckoning after a run of 1 hour. During observations made 4.5 miles SW of Cape Amagalik, the current was rotary, turning clockwise, and followed a definite pattern. A minimum current averaging about 0.8 knot sets N to NE."
Tanaga Island
Tanaga Island is an island in the western Andreanof Islands, in the southwest part of the Aleutian Islands, Alaska. The island has a land area of , making it the 33rd largest island in the United States. Its highest point is volcano Mount Tanaga at ....
and the Delarof Islands
Delarof Islands
The Delarof Islands are a group of small islands at the extreme western end of the Andreanof Islands group in the central Aleutian Islands, Alaska...
the Aleutian Islands of Alaska
Alaska
Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...
. It is about 40 miles long and 13 miles wide at its narrowest part. Tidal currents commonly range between 2 and 3 knots in the pass.
From the U.S. Coast Pilot: "Depths of 50 fathoms or more can be carried through the pass by keeping 6 miles off Cape Amagalik, Tanaga Island, and 3 miles off the Delarof Islands.
"The direction and velocity of the current is radically affected by the land areas and the banks. It appears that the flood is diverted by the chain of islands – Skagul to Unalga – and the relatively shoal water between them to an E and W direction in moving around this chain. It was observed that S of Skagul Island the flood sets about NE, E of this island it sets N, and N of the island it sets N to NW.
"With erratic currents of this nature, dead reckoning cannot be depended on and the navigator may find his vessel 1 mile or more off his reckoning after a run of 1 hour. During observations made 4.5 miles SW of Cape Amagalik, the current was rotary, turning clockwise, and followed a definite pattern. A minimum current averaging about 0.8 knot sets N to NE."
