The main winter subsistence, and the food source that provided the margin of survival, was the dried meat of buffalo, elk, and deer taken in the fall hunts, supplemented by dried roots and berries. Food caches were maintained near camp, but they were generally resorted to only in the spring, when the dried food kept in the lodges was exhausted. The location of the cache was known only to the family that made it. Caches and their contents were considered private property. Dried roots, berries, and salmon were generally kept in the underground caches, but not meat.
Bannock winter camps were spread out along the river; there was no central encampment. The population was predominantly Bannock, although many Shoshone lived among them either through in-marriage or by choice.
Not all of the Bannock wintered on the Snake River. Those who crossed the divide for buffalo frequently did not return in time to cross the mountains before the snows blocked the high passes and so generally wintered in western Montana, not joining the rest until spring.
The Wihinait, or Shoshone of the Fort Hall area, were said to have wintered apart from the Bannock on the Portneuf River. Winter camps ranged along the Portneuf between Pocatello and McCammon, and other places as far south as Malade City, Idaho, were sometimes occupied. Here, too, the population lived off stored food and whatever game could be taken.
The winter quarters of the Shoshone were more secure from enemy attack, however, than were those of the Bannock. The only hostile tribe to enter southern Idaho with any frequency was the Blackfoot. They pressed their attacks vigorously, especially against the Bannock, and were a subject of some wonder owing to their practice of sending out war parties in the middle of winter. Blackfoot war parties, consisting only of men, frequently came south from Montana before the passes were closed by the winter snows and made camp on Henry's Fork, near the present site of St. Anthony, Idaho. From this convenient point they sent small raiding parties against the Bannock camps. The main purpose of these raids was to capture horses, which were driven north to the Blackfoot country when the passes opened in the spring. Although the Bannock were kept on the defensive, they were not the helpless prey of the Blackfoot. Defensive tactics were frequently too late, for the enemy drove off horses surreptitiously by night, but counterraids were made and pursuit was given in return. The Blackfoot occasionally pressed their raids farther downstream and entered the Portneuf Valley, but such forays were less frequent. Historical records, however, mention Blackfoot raids in Yellowstone Park and Jackson Hole and as far south as the valleys of the Green and Bear rivers and Great Salt Lake.
When spring arrived the winter camp broke up and both Shoshone and Bannock split up into small groups, each of which went their separate ways. Hunting was the first undertaking after breaking up winter camp. The spring hunt was usually conducted in Idaho rather than in more distant places, since most people wished to return later in the spring for salmon fishing at Glenn's Ferry. Small parties of only a few lodges each roamed through the mountains of Caribou County, Idaho, in search of deer and elk, while others went southwards into the Bear River and Bear Lake country. Chub were caught in Bear River, and duck eggs were gathered and ducks killed in the marshes at the north end of Bear Lake. During the spring wanderings, roots were dug also.
The route to Bear River went through much the same country as modern U.S. Highway 30 N. Parties ascended the Portneuf River and crossed the divide to the Bear River at the site of Soda Springs. They continued south on the Bear River to Montpelier. Those who did not intend to return for salmon but wished to visit the Eastern Shoshone ascended the Bear River to Cokeville and Sage and crossed the Bear River Divide, passing the fossil-fish beds en route.
As has been mentioned, not all the Shoshone and Bannock went to Glenn's Ferry to take salmon; those who did went in small groups rather than in a body. Parties followed the Snake River down to Glenn's Ferry, where they fished with harpoons. The Fort Hall people apparently did not make fish weirs. The weirs were usually the work of the winter population of the salmon areas, but one informant stated that the Bannock shared in the catch.
Some Bannock continued downstream past Glenn's Ferry and fished in the Bruneau River, while others went to the Boise and Weiser rivers. Trade was conducted with the Nez Percé in the Weiser Valley; informants did not believe that the Bannock or the Shoshone took part in the trade with the Columbia River tribes in the Grand Ronde Valley in northeastern Oregon. This trade was, however, before the memories of any of our informants (or of their fathers).
At the conclusion of the spring salmon run, the scattered camp grounds of Fort Hall Shoshone and Bannock went to Camas Prairie, where they dug camas, yamp, and other roots and fattened their horses for the fall hunt. Roots could also be dug in other areas, like the Weiser Valley and the plains and foothills near Fort Hall, and some families did not go to Camas Prairie.