Question: Cottonwood Creek is known for the runs of what genus of Pacific salmon?

Context paragraphs:
Chum salmon: The chum salmon ("Oncorhynchus keta") is a species of anadromous fish in the salmon family.  It is a Pacific salmon, and may also be known as dog salmon or keta salmon, and is often marketed under the name silverbrite salmon.  The name chum salmon comes from the Chinook Jargon term "tzum", meaning "spotted" or "marked", while "keta" in the scientific name comes from the Evenki language of Eastern Siberia via Russian.

Environmental issues with salmon: Salmon population levels are of concern in the Atlantic and in some parts of the Pacific.  Salmon fishery stocks are still abundant, and catches have been on the rise in recent decades, after the state initiated limitations in 1972.  Some of the most important Alaskan salmon sustainable wild fisheries are located near the Kenai River, Copper River, and in Bristol Bay.  Fish farming of Pacific salmon is outlawed in the United States Exclusive Economic Zone, however, there is a substantial network of publicly funded hatcheries, and the State of Alaska's fisheries management system is viewed as a leader in the management of wild fish stocks.  In Canada, returning Skeena River wild salmon support commercial, subsistence and recreational fisheries, as well as the area's diverse wildlife on the coast and around communities hundreds of miles inland in the watershed.  The status of wild salmon in Washington is mixed.  Out of 435 wild stocks of salmon and steelhead, only 187 of them were classified as healthy; 113 had an unknown status, 1 was extinct, 12 were in critical condition and 122 were experiencing depressed populations.

Cottonwood, Utah: Cottonwood, Utah, has historically referred to a vaguely defined area between and around Big Cottonwood Creek and Little Cottonwood Creek in the Salt Lake Valley:

Cottonwood Creek (Sacramento River): Cottonwood Creek is a major stream in Northern California in the United States and is a tributary of the Sacramento River.  About 68 mi 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.  For its entire length, it defines the boundary of Shasta County and Tehama County.  Because Cottonwood Creek is the largest undammed tributary of the Sacramento River, it is known for its Chinook salmon and steelhead runs.

Pacific Salmon Commission: The Pacific Salmon Commission is a regulatory body run jointly by the Canadian and United States governments. Its mandate is to protect stocks of the five species of Pacific salmon.  Its precursor was the International Pacific Salmon Fisheries Commission, which operated from 1937 to 1985.  The PSC enforces the Pacific Salmon Treaty, ratified by Canada and the U.S. in 1985.

Chinook salmon: The Chinook salmon ("Oncorhynchus tshawytscha") is the largest species in the Pacific salmon genus "Oncorhynchus".  The common name refers to the Chinookan peoples.  Other vernacular names for the species include king salmon, Quinnat salmon, spring salmon, and Tyee salmon.  The scientific species name is based on the Russian common name "chavycha" (чавыча).

Cottonwood Creek Bridge: The Cottonwood Creek Bridge is a bridge over Cottonwood Creek in Colorado Springs, Colorado.  The structure is on the National Register of Historic Places.

Cottonwood Creek (Guadalupe County): Cottonwood Creek is a stream in South Central Texas, United States that runs approximately 9 miles from its source five miles east of New Berlin, Texas (in the Texas Prairielands), to its confluence with the Guadalupe River in Guadalupe County, Texas, four miles southeast of Seguin.  The creek serves as a tributary of the Guadalupe River and forms its watershed near Seguin, Texas.  There is a separate Cottonwood Creek that flows through northern Guadalupe County before discharging into the San Marcos River above Kingsbury.

Sockeye salmon: Sockeye salmon ("Oncorhynchus nerka"), also called red salmon, kokanee salmon, or blueback salmon, is an anadromous species of salmon found in the Northern Pacific Ocean and rivers discharging into it.  This species is a Pacific salmon that is primarily red in hue during spawning.  They can grow up to 84 cm in length and weigh 2.3 to(-) .  Juveniles remain in freshwater until they are ready to migrate to the ocean, over distances of up to 1600 km .  Their diet consists primarily of zooplankton.  Sockeye salmon are semelparous, dying after they spawn.  Some populations, referred to as kokanee, do not migrate to the ocean and live their entire lives in freshwater.

Puget Sound salmon recovery: Puget Sound salmon recovery is a collective effort of federal, state and local authorities and non-profit coalitions of universities, scientists, business and industry aimed at restoring Pacific salmon and anadromous forms of Pacific trout ("Oncorhynchus") within the Puget Sound region.  The Puget Sound lies within the native range of the Pacific Salmon ("Oncorhynchus") and two sea-run forms of Pacific trout, the coastal rainbow trout ("O. mykiss irideus") or steelhead and coastal cutthroat trout ("O. clarki clarki").  Populations of "Oncorhynchus" have seen significant declines since the middle of the 19th century due to over fishing, habitat loss, pollution and disease.  Salmon species residing in or migrating through the Puget Sound to spawning streams include Chum ("O. keta"), Coho ("O. kisutch"), Chinook ("O. tshawytscha"), Sockeye ("O. nerka"), and Pink salmon ("O. gorbuscha").  Pacific salmon require freshwater rivers for spawning and most major tributaries of the Puget Sound have salmon, steelhead and cutthroat trout spawning runs.

Supporting paragraphs: Cottonwood Creek (Sacramento River) Chinook salmon
Answer: Oncorhynchus