The Chilkoot Lake is marked on the quadrant map of the Skagway B 2 USGS in the Heines County at an altitude of . The lake is about long, and about in width and maximum depth of water in the lake is about . It is located at the foot of the Takshanuk Mountains to the west and the Freebee glacier and unnamed mountains to the east. It has been declared as navigable. The lake is in the upper part of the Chilkoot Watershed that spans of land in length and in width. The waters of the lake display turquoise color. The lake is surrounded by mountains and is glacial fed. The lake is deep water body with maximum depth of . The of land around the lake is mostly under the control of the State. The Upper reach of the river from its mouth at the lake up to the glacier head is about and the land is with the State. The lake area is generally windy.