Marshal Lake, Centennial Trail, Frank Church River of No Return Wilderness, Idaho.
you can, if in a narrow enough vehicle drive on the southern portion of the Centennial Trail, starting just past Vinegar Creek boat landing and the end of the road On the Salmon River. If you don’t get lost like I did, which was how I found this lake, you can come out just past War Eagle Mountain at Secesh near Burgdorf hot springs.