Lower Deer Lake

Lower Deer Lake
Location	Custer County, Idaho
Coordinates	43.942271°N 114.632206°W / 43.942271; -114.632206
Primary inflows	Deer Creek
Primary outflows	Deer Creek to Germania Creek
Basin countries	United States
Max. length	585 ft (178 m)
Max. width	355 ft (108 m)
Surface elevation	9,500 ft (2,900 m)

Lower Deer Lake is an alpine lake in Custer County, Idaho, United States, located in the Boulder Mountains in Sawtooth National Recreation Area. While no trails lead to the lake, it is most easily accessed from trails 111 or 215. It is located just north and downstream of Upper Deer Lake.