What state is west of the Continental Divide?

States primarily west of the Continental Divide include California, Oregon, Washington, and the western portions of Idaho, Nevada, Utah, Arizona, and Alaska, where rivers flow toward the Pacific Ocean rather than toward the Atlantic or Gulf of Mexico. The Continental Divide runs along the crest of the Rocky Mountains in the lower 48 states and through the Brooks Range and other ranges in Alaska. West of this watershed boundary, water drains through the Columbia River system (Oregon, Washington, Idaho), the Snake River, the Klamath River, the Sacramento and San Joaquin rivers (California), the Colorado River (Arizona, Nevada, Utah, southern California), and the Sierra Nevada and Cascade range systems generally to the Pacific. East of the Divide, water flows through the Mississippi-Missouri system, the Rio Grande, or the Hudson Bay drainage.

Several Mountain States straddle the Divide, with portions in both watersheds: Montana, Wyoming, Colorado, and New Mexico. Their territory is split, with their western portions draining to the Pacific and their eastern portions draining to the Mississippi or the Rio Grande. California is entirely west of the Divide and entirely Pacific-oriented; its Sacramento and San Joaquin rivers drain through San Francisco Bay, while southeastern California drains through the Colorado River. Oregon and Washington are entirely west of the Divide. Their major rivers (Columbia, Snake, Willamette) drain to the Pacific.

Idaho is mostly west of the Divide, with its eastern panhandle draining to the Snake River. Nevada is entirely west of the Divide, although the Great Basin in central Nevada has internal drainage to landlocked basins like the Great Salt Lake (technically not flowing to any ocean). Utah's western portion is in the Great Basin internal drainage; its eastern portion drains through the Colorado River system west of the Divide. Arizona is mostly west of the Divide, with most water draining through the Colorado River.

The Pacific states share several characteristics: maritime influence on weather, generally milder coastal climates than interior states, and access to Pacific Rim trade. Their populations cluster along the coast (Los Angeles, San Francisco, San Diego, Portland, Seattle) and along major river valleys (Sacramento Valley, San Joaquin Valley, Willamette Valley). Their economies include technology, entertainment, aerospace, agriculture, tourism, and forestry. Their cultures have been shaped by Asian immigration, Hispanic heritage, indigenous Pacific Northwest cultures, and frontier settlement traditions.

The states west of the Divide collectively contain about 60 million people and produce vast quantities of fruit, vegetables, wine, lumber, and technology products. The Pacific states' political orientation has trended Democratic in recent decades, though significant political diversity remains.