Achomawi are the northerly nine bands of the Pit River tribe of Palaihnihan Native Americans who live in what is now northeastern California in the United States. These 5 autonomous bands of the Pit River Indians historically spoke slightly different dialects of one common language, and the other two bands spoke dialects of a related language, called Atsugewi. The name "Achomawi" means river people and properly applies to the band which historically inhabited the Fall River Valley and the Pit River from the south end of Big Valley Mountains, westerly to Pit River Falls. The nine bands of Achumawi lived on both sides of the Pit River from its origin at Goose Lake to Montgomery Creek, and the two bands of Atsugewi lived south of the Pit River on creeks tributary to it in the Hat Creek valley and Dixie Valley.
The Wintun are members of several related Native American peoples of Northern California, including the Wintu (northern), Nomlaki (central), and Patwin (southern). Their range is from approximately present-day Lake Shasta to San Francisco Bay, along the western side of the Sacramento River to the Coast Range. Each of these tribes speak one of the Wintuan languages. Linguistic and archaeological evidence suggests that the Wintun people probably entered the California area around 500 AD from what is now southern Oregon, introducing bow and arrow technology to the region. There has been carbon dating of several artifacts by UC Berkeley that dates back to around 10,000 years, and several of these artifacts have now been repatriated. Despite being a major influence on the region's history, there is still very little history on the Wintu due to centuries of genocide and displacement that still occur today along with continued destruction of sacred ceremonial and religious sites, often due to companies that ignore legal or ethical considerations.
Shasta Dam is a concrete arch-gravity dam across the Sacramento River in Northern California in the United States. At 602 feet (183 m) high, it is the eighth-tallest dam in the United States. Located at the north end of the Sacramento Valley, Shasta Dam creates Shasta Lake for long-term water storage, flood control, hydroelectricity and protection against the intrusion of saline water. The largest reservoir in the state, Shasta Lake can hold about 4,500,000 acre-feet (5,600 GL).
The McCloud River is a 77.1-mile (124.1 km) long river that flows east of and parallel to the upper Sacramento River, in Siskiyou County and Shasta County in northern California in the United States. Protected under California's Wild and Scenic Rivers Act (1972), it drains a scenic mountainous area of the Cascade Range, including part of Mount Shasta. It is a tributary of the Pit River, which in turn flows into the Sacramento River. The three rivers join in Shasta Lake, formed by Shasta Dam north of Redding.
The Trinity River is a major river in northwestern California in the United States and is the principal tributary of the Klamath River. The Trinity flows for 165 miles (266 km) through the Klamath Mountains and Coast Ranges, with a watershed area of nearly 3,000 square miles (7,800 km2) in Trinity and Humboldt Counties. Designated a National Wild and Scenic River, along most of its course the Trinity flows swiftly through tight canyons and mountain meadows.
The Winnemem Wintu are a Native American band of the Wintu tribe originally located along the lower McCloud River, above Shasta Dam near Redding, California.
The Okwanuchu were one of a number of small Shastan-speaking tribes of Native Americans in Northern California, who were closely related to the adjacent larger Shasta tribe.
The Shastan peoples are a group of linguistically related Indigenous peoples from the Klamath Mountains. They traditionally inhabited portions of several regional waterways, including the Klamath, Salmon, Sacramento and McCloud rivers. Shastan lands presently form portions of the Siskiyou, Klamath and Jackson counties. Scholars have generally divided the Shastan peoples into four languages, although arguments in favor of more or fewer existing have been made. Speakers of Shasta proper-Kahosadi, Konomihu, Okwanuchu, and Tlohomtah’hello "New River" Shasta resided in settlements typically near a water source. Their villages often had only either one or two families. Larger villages had more families and additional buildings used by the community.
Wintuan is a family of languages spoken in the Sacramento Valley of central Northern California.
The Nomlaki are a Wintun people native to the area of the Sacramento Valley, extending westward to the Coast Range in Northern California. Today some Nomlaki people are enrolled in the federally recognized tribes: Round Valley Indian Tribes, Grindstone Indian Rancheria or the Paskenta Band of Nomlaki Indians. The Nomlaki were bordered by the Wintu (Wintun) in the north, the Yana in the northeast and east, the Konkow (Maiduan) in the east, the Patwin (Wintun) in the south, and the Yuki in the west.
The Patwin are a band of Wintun people in Northern California. The Patwin comprise the southern branch of the Wintun group, native inhabitants of California since approximately 500.
The Chimariko are an Indigenous people of California, who originally lived in a narrow, 20-mile section of canyon on the Trinity River in Trinity County in northwestern California.
Kuksu was a religion in Northern California practiced by members within several Indigenous peoples of California before and during contact with the arriving European settlers. The religious belief system was held by several tribes in Central California and Northern California, from the Sacramento Valley west to the Pacific Ocean.
Wintu-Nomlaki traditional narratives include myths, legends, tales, and oral histories preserved by the Wintu and Nomlaki people of the western Sacramento Valley in northern California.
Northeastern Pomo, also known as Salt Pomo, is a Pomoan language of Northern California. There are no living fluent speakers. It was spoken along Stony Creek, a tributary of the Sacramento River. Northeastern was one of seven mutually unintelligible Pomoan languages spoken in Northern California. Unlike the other six Pomoan languages, Northeastern Pomo was not spoken in an area immediately contiguous with any other Pomoan-speaking area. Northeastern Pomo speakers were ringed by speakers of Yuki, Nomlaki, and Patwin; Yuki is unrelated to Pomoan or Nomlaki and Patwin, both of which are within the Wintu language family.
The Cachil DeHe Band of Wintun Native Americans of the Colusa Native Americans Community of the Colusa Rancheria is a federally recognized tribe of Wintun Native Americans from central California.
Patwin (Patween) is a critically endangered Wintuan language of Northern California. As of 2021, there was one documented first language speaker of Patwin. As of 2010, Patwin language classes were taught at the Yocha Dehe Wintun Nation tribal school.
The Yocha Dehe Wintun Nation is a federally recognized tribe of Wintun people, specifically Patwin people or southern Wintun, in Yolo County, California. They were formerly known as the Rumsey Indian Rancheria of Wintun Indians of California.
Kabyai Creek massacre or Kaibai Creek massacre was a massacre against Winnemem Wintu people. A party of white settlers attacked a Winnemem Wintu village at Kabyai Creek, on the McCloud River. 42 Winnemem Wintu men, women and children were killed.
Cottonwood Creek is a major stream and tributary of the Sacramento River in Northern California. About 68 miles (109 km) long measured to its uppermost tributaries, the creek drains a large rural area bounded by the crest of the Coast Ranges, traversing the northwestern Sacramento Valley before emptying into the Sacramento River near the town of Cottonwood. It defines the boundary of Shasta and Tehama counties for its entire length. Because Cottonwood Creek is the largest undammed tributary of the Sacramento River, it is known for its Chinook salmon and steelhead runs.
United States Northern Sacramento Valley, California 
