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Map showing extent of the Willamette Lowland basin-fill aquifer. The Willamette Lowland basin-fill aquifer is 31,000 km 2, 12,000 square mile aquifer underlying the region of Oregon and parts of Washington (state) between the Oregon Coast Range and the Cascade Range. [1]
Areas where groundwater depletion is a concern are in the Umatilla area, and the Palouse slope. In the Umatilla area, total decline since the 1970s is from 300 ft to 100 ft of water height. Overall, between 1968-2009, mean groundwater decline across the aquifer system was at 1.0 ft/year. [1]
The state of Washington has numerous large aquifers, as shown in this map of the Hydrogeology of Washington State. Spokane Valley–Rathdrum Prairie Aquifer [6] covers 325 square miles (842 km 2) in eastern Washington and Idaho. It provides drinking water for some 700,000 people.
A map released Tuesday in the journal Nature offers the first comprehensive map of the world’s underground water sources and the ecosystems that depend on them. In…
Oregon and Washington. 6,250 sq mi (16,200 km 2) HUC1708: 1709 Willamette subregion: The Willamette River Basin. Oregon: 11,400 sq mi (30,000 km 2) HUC1709: 1710 Oregon–Washington Coastal subregion: The drainage into the drainage boundary to the Smith River Basin boundary, excluding the Columbia River Basin. California, Oregon, and Washington.
Mill Creek is a 36.5-mile (58.7 km) long [3] tributary of the Walla Walla River, flowing through southeast Washington and northeast Oregon in the United States. It drains from the western side of the Blue Mountains into the Walla Walla Valley and flows through the city of Walla Walla, which draws most of its water supply from the creek.
Columbia River Basin. Wallula Gap (/ w ə ˈ l uː l ə /) is a large water gap of the Columbia River in the Northwestern United States, in Southeastern Washington.It cuts through the Horse Heaven Hills basalt anticlines in the Columbia River Basin, just south of the confluence of the Walla Walla and Columbia rivers.
The Walla Walla River is a tributary of the Columbia River, joining the Columbia just above Wallula Gap in southeastern Washington in the United States. The river flows through Umatilla County, Oregon, and Walla Walla County, Washington. [1] Its drainage basin is 1,758 square miles (4,550 km 2) in area. [2]