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Plateau Region Tribes
The area between the Cascade Mountains and the Rocky Mountains in Washington, Oregon, Idaho, British Columbia, and Western Montana is known as the Plateau Culture area.
From north to south it runs from the Fraser River in the north to the Blue Mountains in the south. One of the most important geographic and culture features of the region is the Columbia River.American Indian people have lived along the Columbia River in permanent and semi-permanent villages for thousands of years. As with other American Indian people, art was not a separate category in their lives, but was a part of everyday life. Their most important art forms were carvings, beadwork, and basketry.
While it is common for people to assume that basketry refers to containers, the Plateau peoples often wore them as hats.
Also called Sally Bags and Corn Husk Bags, these bags were made from cornhusk, hemp, string, and yarn using a continuous weave that eliminates seams. Originally, these bags were used for storing foods, such as roots, as the tightness of the weave keeps out dust and dirt.
Columbia Plateau and the Tribes who lived in this region
Location: Washington | Oregon | Idaho | Part of Montana | Part of CaliforniaThe Plateau Region has three sub-regions: the Sierra and Cascade Mountains, the Rocky Mountains, and the Columbia Plateau, which are further divided into 14 ecoregions. At least forty-seven tribes called this area home.
The Columbia Plateau is bordered by the Northern Rocky Mountains to the east and in the west by the Sierra Nevada and Cascade Mountain ranges. The plateau covers an area of about 100,000 square miles (260,000 square km) in British Columbia, Canada, and Washington, Oregon, and a small part of Idaho that is mostly covered with basaltic lava flows. The mountainous regions extend into northern California, parts of Washington and northwestern Montana.
The elevation ranages from 500 feet to 5,000 feet (60 to 1,500 m) above sea level on the plateau, and over 14,000 feet in the mountains.
The climate is semi-arid highland desert, and vegetation is limited mostly to sagebrush shrubs and grasses on the plateau.
It includes nearly 500 miles (800 km) of the Columbia River, as well as the lower reaches of major tributaries such as the Snake and Yakima rivers and their associated drainage basins.
The Columbia and Snake Rivers are the major water systems in the region. Other rivers include the Deschutes, John Day, Umatilla, and Walla Walla rivers.
The extensive Columbia River system drains the Rocky Mountains on its way to the Pacific Ocean. As it flows to the Columbia River, the Snake River passes through a broad plain in southern Idaho—the Snake River plain.
The ancient Columbia River was forced into its present course by the northwesterly advancing lava. The lava, as it flowed over the area, first filled the stream valleys, forming dams that in turn caused numerous lakes to form.
A porous, volcanic bedrock lies underneath the plain, so Snake River tributaries often disappear underground, thus creating a need for irrigation. After coursing through this plain, the Snake River flows through Hell's Canyon—a 6,000-foot-deep gorge—before reaching the Columbia River.
This main river also carves its way through a relatively open area, the Palouse hills of Washington, another irrigated farm region. Aside from the Palouse hills and the Snake River plain, much of the Columbia Plateau consists of mountains, such as the Blue Mountains, that lie in the rain shadow of the Cascade Mountains.
The average precipitation in this area is only 12 inches per year, with most moisture falling in the form of winter snows in the mountains.
There are five volcanoes in the Columbia Plateau region, which were visited by Lewis and Clark on their epic journey. They are Mount Adams, Mount Hood, Mount Jefferson, Mount Rainier, and Mount St. Helens. Mount St. Helens had a massive eruption as recently as 1980, which blew out the side of the mountain and deposited significant ash hundreds of miles away. All together, there are 27 active volcanic areas in the Plateau Region today, with ten volcanoes having a high probability of eruption in this century.
Also known as the Columbia Basin, and originally carved by glaciers and slowly eroded over time by the Columbia River, the basin was further sculpted about 12,000 years ago by a series of violent flows known as the Spokane Floods. The floods left behind strange basaltic rock formations known as the Channeled Scablands.
The basin is characterized by native shrub-steppe vegetation and thousands of acres of ponds and marshes created by irrigation water from the Columbia Basin Project. Southwest Washington includes the vast wheat fields of the Palouse Hills and the rugged Blue Mountains which straddle the border between Washington and Oregon.
During the early stages of the Columbia Basin formation, granite rock was slowly created by heat and pressure deep in the crust of the earth. Then the crust was uplifted, exposing the granite, creating mountains similar to the Okanogan Highlands north of Grand Coulee Dam. Forty to sixty million years ago the formation of the outline of the Columbia Basin was complete. The land had subsided below sea level, and a large inland sea had formed. The land was again uplifted and then, 10-15 million years ago, was flooded with volcanic lava. The boundaries of the flood lava were located in almost the same position as the former seashore. Many layers of lava were needed to build up to a 5,000 feet (1500 meter) thickness and form the smooth surfaced Columbia Plateau.
During the Ice Age, the old Cascade Mountains were also formed. Their outline still remains on the western slopes of the Cascades. The uplifting mountains were not able to block the flow of the Columbia River completely, and a deep Columbia River gorge was formed. Near the end of the Ice Age the volcanoes of the high Cascades rose to elevations of 14,000-15,000 feet (4000-4500 meters). Older volcanoes, such as Mt. Hood and Mt. Rainier, were sculpted by glaciers of the Ice Age; others such as Mt. St. Helens remained unsculpted, retaining their original volcanic form.
Eighteen thousand years ago the Columbia Basin was nearly covered by floodwaters when an ice dam at Lake Missoula in western Montana broke. Large boulders were strewn near the outlet of the Lower Coulee (Lake Lenore). Other boulders were carried in icebergs as far as western Oregon.
The floodwaters were 800 feet (250 meters) deep near Pasco and 400 feet (125 meters) deep at Portland. After the Ice Age, the Columbia River returned to its former channel. The channeled scab lands and large coulees that had been formed were left stranded 500-1600 feet (150-500 meters) above the present river floor and serve as a constant reminder of some of the most unusual episodes in geologic history.
Prior to the European invasion, the Indian people of the Plateau area-roughly the area between the Rocky Mountains and the Cascade Mountains in the Pacific Northwest-decorated their clothing and other items with paintings, with beads made from shell, animal teeth, bone, and other items, and with porcupine quills.
With the European invasion, new decorative elements became available to the Indians: glass beads. These beads were quickly adopted into the cultures and began to replace and supplement both painting and quilling. The Plateau Indians soon became well-known for their fine bead work.
Beaded bags are made and used throughout the Plateau area. The beaded bags are usually made from cloth and beaded on one side only. The beadwork is an appliqué technique in which the beads lie evenly over the surface of the bag in straight rows that extend from one side of the bag to the other. The main design is beaded first and then the background is beaded around it.
Plateau Cultural Practices
One of the cultural practices of the Indian people of the Lower Columbia was cranial deformation: the flattening of the head. As an infant, the child would be placed in a cradleboard which had a board that came down over the child’s forehead. The board would then be tied firmly in place. The result, seen in the painting above, was the high forehead. This custom was practiced especially by more prestigious members of the tribes.
The Indian nations of the Lower Columbia traditionally buried their dead in raised canoes along with all their worldly possessions. The name of the dead person was never spoken again.
The Chinook, Clatsop, and Kathlamet languages all belong to the Chinookan language family. The Tillamook language, spoken farther south, belongs to the Salish language family, and the Klatskanie language, spoken to the east, belongs to the Athapascan language family.
The Indians of the Lower Columbia River lived in villages of 5 to 20 permanent longhouses. The houses, made from cedar planks and cedar logs, ranged in size from 20 to 60 feet in length and from 14 to 20 feet in width. The roof was a pitched gable with a long overhanging eve. The houses were built over a pit that was 4-5 feet deep and roughly the same size as the dwelling.
- Cayuse, Oregon
- Celilo (Wayampam)
- Upper Chinookan (Dialects: Clackamas, Cascades, Hood River Wasco, Wishram Kathlamet, Wishram, Cathlamet, Multnomah)
- Columbian (Dialects: Wenatchee, Sinkayuse, Chelan) Washington, Oregon
- Coeur d'Alene, Idaho
- Colville, Washington
- Upper Cowlitz
- Flathead (Selisch or Salish), Idaho and Montana
- John Day
- Kalispel Washington
- Klamath, Oregon
- Klikitat, Washington
- Kootenai/Ktunaxa, British Columbia, Montana, Idaho
- Lower Snake (Chamnapam, Wauyukma, Naxiyampam)
- Modoc, California, Oregon
- Molala (Molale) Oregon
- Nez Perce, Idaho and Washington
- Nicola Athapaskans (extinct)
- Nlaka'pamux aka the Thompson people, British Columbia
- Okanagan (Siylx), British Columbia & Washington (Dialects: Northern and Southern)
- Palus (Palouse), Washington
- Pend'Oreilles (Kalispel), Washington
- Rock Creek
- Secwepemc (Shuswap), British Columbia
- Sinixt (Lakes Indians), British Columbia, Washington, Idaho
- Spokane, Washington
- St'at'imc (Lillooet)
- Tygh Valley
- Umatilla Oregon
- Upper Nisqually (Mishalpan)
- Walla Walla, Oregon and Washington
- Wasco, Oregon
- Yakama (Yakima), Washington
Salish nations inhabited the upper Columbia River and middle Fraser River regions of the Cordillera, and were separated from the coastal region by the Cascade and Coast Mountains, through which the Columbia and Fraser Rivers flow. They include the Flathead and Pend d’Oreille nations of present-day Montana; the Coeur d’Alene of Idaho; the Kalispel, Colville, Spokan, Sanpoil, Nespelem, Methow Penskwaus, Wenatchee, Okanogan-Similkameen, and Sintaiekt of Washington; and the Lakes Sinixt, Okanagan-Similkameen, Secwepemc, Nlakapmx, and St’at’imc of British Columbia.