Green lake tributary of Beaver river, 107°40'W. 54°15'N. Hudson's Bay Co. seems to have established the first fort on Green lake. It was built before 1795 at north end of lake. This post was seized by the North West Co. on December 21^st, 1816 and again on March 17, 1817 and plundered. It was raided by Indians in the rebellion of 1885. The Company has maintained this post to date. About 1820 another Hudson's Bay Co. post was built at the south end of the lake.

The North West Co. erected their fort at the north end of the lake on the east shore of the bay, near the Hudson's Bay Co. fort. It was built before 1798 and probably immediately after the Hudson's Bay Co. had erected their fort. David Thompson met Fidler at the Green lake fort 1799 and was there in 1798.

The N.W. Co. fort is shown on D. Thompson' map 1812 No. 7 and the H. B. Co. fort on Arrowsmith map 1857 No. 8, 1832 No. 101, 1850 No. 100.