Dworshak National Fish Hatchery is a mitigation hatchery located on the Clearwater River within the Nez Perce Reservation near Ahsahka, in north-central Idaho, United States. It was constructed in 1969 by the Army Corps of Engineers, and is co-managed by the U.S. Fish and Wildlife Service and the Nez Perce Tribe. The hatchery is one of the largest combination producers of anadromous (migratory) fish in the world. These fish make a 1000-mile round trip to the ocean and back to spawn in the Clearwater River. The Dworshak Dam blocks access to the historical spawning areas on the North Fork-Clearwater River for the steelhead, and it is too high for a fish ladder.
Steelhead, chinook and coho salmon are spawned and reared at the facility. The hatchery attempts to mitigate or make up for some of the lost spawning area by collecting mature adult fish, fertilizing their eggs, and raising them for 1–1½ years, until they are large enough to begin their 500-mile journey to the Pacific Ocean. The young fish must survive a variety of hazards in the long journey, including swimming past eight dams on the Snake and Columbia Rivers. During the summer months the dams increase their water releases to aid fish migration downstream.
The Dworshak hatchery is unique because of its ability to control the water temperature in the steelhead rearing ponds. By keeping the temperature at 54 degrees Fahrenheit, the juvenile steelheads are able to be released after one year at a length of 8 inches. In cold water, it would take an additional year to grow those same 8 inches. The hatchery accomplishes this through the recirculation of up to 90 percent of its water. [1]
The hatchery is part of Dworshak Fisheries Complex, which also includes Kooskia National Fish Hatchery, the Idaho Fish Health Center, and the Idaho Fisheries Resource Office.
Dworshak National Fish Hatchery is open to visitors during daylight hours. The facility has a self-guided tour route and offers pre-arranged guided tours. The hatchery is located approximately three miles west of Orofino, ID on Highway 7.
The best fish viewing seasons are: February - April for adult steelhead, June - August for adult chinook, and October - December for coho and steelhead.
Dworshak Dam and Hatchery were named after Henry Dworshak, a Republican Senator from Idaho during 1946–1962.
The Nez Perce are an Indigenous people of the Plateau who still live on a fraction of the lands on the southeastern Columbia River Plateau in the Pacific Northwest. This region has been occupied for at least 11,500 years.
The Snake River is a major river of the greater Pacific Northwest region in the United States. At 1,078 miles (1,735 km) long, it is the largest tributary of the Columbia River, in turn, the largest North American river that empties into the Pacific Ocean. The Snake River rises in western Wyoming, then flows through the Snake River Plain of southern Idaho, the rugged Hells Canyon on the Oregon–Idaho border and the rolling Palouse Hills of Washington, emptying into the Columbia River at the Tri-Cities in the Columbia Basin of Eastern Washington.
Clearwater County is a county located in the U.S. state of Idaho. As of the 2020 census, the population was 8,734. The county seat is Orofino. Established in 1911, the county was named after the Clearwater River.
Orofino is a city in and the county seat of Clearwater County, Idaho, United States, along Orofino Creek and the north bank of the Clearwater River. It is the major city within the Nez Perce Indian Reservation. The population was 3,142 at the time of the 2010 census.
The San Lorenzo River is a 29.3-mile-long (47.2 km) river in the U.S. state of California. The name San Lorenzo derives from the Spanish language for "Saint Lawrence" due to its reported sighting on that saint's feast day by Spanish explorers. Its headwaters originate in Castle Rock State Park in the Santa Cruz Mountains and flow south by southeast through the San Lorenzo Valley before passing through Santa Cruz and emptying into Monterey Bay and the Pacific Ocean.
The Napa River is a river approximately 55 miles (89 km) long in the U.S. state of California. It drains a famous wine-growing region called the Napa Valley, in the mountains north of the San Francisco Bay. Milliken Creek and Mt. Veeder watersheds are a few of its many tributaries. The river mouth is at Vallejo, where the intertidal zone of fresh and salt waters flow into the Carquinez Strait and the San Pablo Bay.
Clearwater National Forest with headquarters on the Nez Perce Reservation at Kamiah is located in North Central Idaho in the northwestern United States. The forest is bounded on the east by the state of Montana, on the north by the Idaho Panhandle National Forest, and on the south and west by the Nez Perce National Forest and Palouse Prairie.
Steelhead, or occasionally steelhead trout, is the common name of the anadromous form of the coastal rainbow trout (Oncorhynchus mykiss irideus) or Columbia River redband trout. Steelhead are native to cold-water tributaries of the Pacific basin in Northeast Asia and North America. Like other sea-run (anadromous) trout and salmon, steelhead spawn in freshwater, smolts migrate to the ocean to forage for several years and adults return to their natal streams to spawn. Steelhead are iteroparous, although survival is approximately 10–20%.
The Salmon River is a small river north of Syracuse in Upstate New York, the United States. It is a popular and economically important sportfishing destination, and the most heavily fished of New York's Lake Ontario tributaries. From its headwaters in the Tug Hill region of New York, it flows 44 miles (71 km) westward through two hydroelectric dams and over the 110-foot (34 m) Salmon River Falls before it empties into eastern Lake Ontario at Port Ontario in Oswego County. The Salmon River watershed drains approximately 280 square miles (730 km2).
Lake Oroville is a reservoir formed by the Oroville Dam impounding the Feather River, located in Butte County, northern California. The lake is situated 5 miles (8 km) northeast of the city of Oroville, within the Lake Oroville State Recreation Area, in the western foothills of the Sierra Nevada. Known as the second-largest reservoir in California, Lake Oroville is treated as a keystone facility within the California State Water Project by storing water, providing flood control, recreation, freshwater releases to assist in controlling the salinity intrusion into the Sacramento-San Joaquin Delta and protecting fish and wildlife.
In 1942, the Coleman National Fish Hatchery was established under an act of the U.S. Congress to mitigate the loss of historic spawning habitat caused by the construction of dams. The fish hatchery is located in Shasta County, California near the town of Anderson on the north bank of Battle Creek approximately 6 river miles (9.7 km) east of the Sacramento River. Coleman NFH covers approximately 75 acres (300,000 m2) of land owned by the U.S. Fish and Wildlife Service (USFWS), with an additional 63 acres (250,000 m2) of land in perpetual easements for pipelines and access. It is the largest salmon hatchery in the continental United States.
Dworshak Dam is a concrete gravity dam in the western United States, on the North Fork of the Clearwater River in north central Idaho. In Clearwater County, the dam is located approximately four miles (6 km) northwest of Orofino and impounds the Dworshak Reservoir for flood control and hydroelectricity generation.
The Selway River is a large tributary of the Middle Fork of the Clearwater River in the U.S. state of Idaho. It flows within the Selway-Bitterroot Wilderness, the Bitterroot National Forest, and the Nez Perce National Forest of North Central Idaho. The entire length of the Selway was included by the United States Congress in 1968 as part of the National Wild and Scenic Rivers Act.
Issaquah Creek is a small stream flowing through the city of Issaquah and nearby communities, in the U.S. state of Washington. Its headwaters are on the slopes of Cougar, Squak, Tiger, and Taylor mountains in the Issaquah Alps. Tributaries of Issaquah Creek include Holder Creek, Carey Creek, Fifteen-mile Creek, McDonald Creek, East Fork Issaquah Creek, and North Fork Issaquah Creek. The creek empties into the south end of Lake Sammamish. The lake's outlet is the Sammamish River, which in turn empties into Lake Washington and ultimately Puget Sound.
The Mokelumne River River Fish Hatchery is a fish hatchery in San Joaquin County, California, built in 1963 by the East Bay Municipal Utility District (EBMUD).
Lost Creek Lake is a reservoir located on the Rogue River in Jackson County, Oregon, United States. The lake is impounded by William L. Jess Dam which was constructed by the U.S. Army Corps of Engineers in 1977 for flood control and fisheries enhancement. The lake and dam were the first completed elements of the multi-purpose Rogue River Basin Project, consisting of Lost Creek Lake, Applegate Lake and the Elk Creek project. The lake is located approximately 27 miles (43 km) northeast of Medford.
Kooskia National Fish Hatchery is a "mitigation" hatchery located on the Clearwater River within the Nez Perce Indian Reservation near Kooskia, in north-central Idaho. Construction began in 1966 by the Army Corps of Engineers. With funding provided by the United States per a water rights settlement the hatchery is managed and operated by the Nez Perce Tribe. The production goal is to raise and release up to 600,000 juvenile spring Chinook salmon annually.
The Clearwater River is in the northwestern United States, in north central Idaho. Its length is 74.8 miles (120.4 km), it flows westward from the Bitterroot Mountains along the Idaho-Montana border, and joins the Snake River at Lewiston. In October 1805, the Lewis and Clark Expedition descended the Clearwater River in dugout canoes, putting in at "Canoe Camp," five miles (8 km) downstream from Orofino; they reached the Columbia Bar and the Pacific Ocean about six weeks later.
Boise Creek is a stream in Humboldt County, California, United States. From its origin on Orleans Mountain it flows 8.5 miles to join the Klamath River about 2.25 miles southeast of Orleans, California. The creek lies within the Six Rivers National Forest and is part of the Lower Klamath River Watershed.
The Nimbus Fish Hatchery is located in eastern Sacramento County, built on the downstream side of the Nimbus Dam. It is one of the 21 fish hatcheries the California Department of Fish and Wildlife oversees. Chinook salmon and steelhead are raised, and about 4 million Chinook salmon and 430,000 steelheads released each year.