Elevation: 10,728 ft
Climbing and access information for this Lemhi Range peak, one of four Idaho peaks named Long Mountain, is found on page 297.
This expands upon the info in the guidebook.
Long Mountain can be attained fairly easy from its east and south ridges. I did it as part of a backpack in the Hayden Creek valley along with May Mountain.
To climb from the south, try to find a stable route up the scree from the lakes south of Peak 10,402. Once atop the ridge, excellent goat trails lead you up over Points 10,402 and 10,442 onto huge tundra flats before ascending Long Mountain’s west peak (which has the name on the topo map) and then turning east to the main summit.
To climb from the east ridge, just leave the Hayden Creek/Kadletz Creek Trails at the highest point on the ridge and follow it to the top over scree and talus. No need to climb on snow, as the guidebook says.