| Arch Lake (Montana) | |
| Location: | 12miles northeast of US 212 |
| Coords: | 45.1592°N -109.7383°W |
| Lake Type: | natural freshwater lake |
| Basin Countries: | United States |
| Length: | 2590feet |
| Width: | 930feet |
| Area: | 50.240NaN0 |
| Depth: | 39feet |
| Max-Depth: | 112feet |
| Elevation: | 9997feet[1] |
| Islands: | multiple islets |
| Pushpin Map: | Montana#USA |
| Pushpin Map Alt: | Location of Arch Lake in Montana, USA. |
Arch Lake is a lake in Carbon County, Montana, in the United States.
Arch Lake took its name from the granite arch that sits on the south ridge.[2] It is remote from all roads, but can be reached on foot. Much of the route to it is rugged and part of the way has no trail.[3]