Columbia Encyclopedia

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Skagit

(Encyclopedia)Skagit skăjˈĭt [key], river, c.150 mi (240 km) long, rising in the Cascade Range, British Columbia, and flowing SW through Wash. into Puget Sound. Gorge High Dam, Diablo Dam, and Ross Dam provide e...

Lassen Volcanic National Park

(Encyclopedia)Lassen Volcanic National Park, 106,372 acres (43,081 hectares), N Calif., at the southern end of the Cascade Range. Proclaimed as Lassen Peak and Cinder Cone national monuments in 1907, the two were i...

Columbia Plateau

(Encyclopedia)Columbia Plateau, physiographic region of North America, c.100,000 sq mi (259,000 sq km), NW United States, between the Rocky Mts. and the Cascade Range in Washington, Oregon, and Idaho. Most of the p...

Willamette

(Encyclopedia)Willamette wĭlămˈət [key], river, 294 mi (473 km) long, rising in several headstreams in the Cascade Range, W Oregon. It flows N past Eugene, Salem, and Portland to the Columbia River just NW of P...

Puget Sound

(Encyclopedia)Puget Sound pyo͞oˈjĕt [key], arm of the Pacific Ocean, NW Wash., connected with the Pacific by Juan de Fuca Strait, entered through the Admiralty Inlet and extending in two arms c.100 mi (160 km) S...

Crater Lake National Park

(Encyclopedia)Crater Lake National Park, 183,224 acres (74,206 hectares), SW Oreg., in the Cascade Range; est. 1902. Crater Lake, 20 sq mi (52 sq km), lies in a huge pit that was created when the top of a prehistor...

Saint Helens, Mount

(Encyclopedia)Saint Helens, Mount, volcanic peak, 8,363 ft (2,549 m; 9,677 ft/2,950 m before its 1980 eruption) high, SW Wash., historically the most active volcano in the Cascade Range. Dormant since 1857, Mt. St....

Elyria

(Encyclopedia)Elyria ēlērˈēə [key], city (2020 pop. 52,656), seat of Lorain co., N Ohio, on the Black ...

Boise project

(Encyclopedia)Boise project, in the Boise, Payette, and Snake river valleys, SW Idaho and E Oregon; developed in 1905 by the U.S. Bureau of Reclamation for irrigation, hydroelectricity, flood control, and recreatio...

Bonneville Dam

(Encyclopedia)Bonneville Dam bŏnˈəvĭl [key], one of the major dams on the Columbia River where it passes through the Cascade Mts., between Oregon and Wash. The dam, 2,690 ft (820 m) long and 197 ft (60 m) high,...