Twin Falls (Washington)

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Twin Falls
Twin falls lower fall.jpg
Lower Fall of the Twin Falls
Locationsoutheast of North Bend, Washington
Coordinates 47°26′44″N121°41′47″W / 47.44542°N 121.69638°W / 47.44542; -121.69638 Coordinates: 47°26′44″N121°41′47″W / 47.44542°N 121.69638°W / 47.44542; -121.69638
Type Fan
Elevation869 feet [1]
Total height135ft
Number of drops1
Average width30ft
Watercourse South Fork of Snoqualmie River

Twin Falls is a waterfall on the South fork of the Snoqualmie River, [2] off exit 34 on I-90 in the Olallie State Park. Twin Falls features a well-hidden underground run-of-the-river hydroelectric project that generates 24 MW of electricity. [3] The powerhouse is located 325 feet below ground.

Snoqualmie River river in the United States of America

The Snoqualmie River is a 45-mile (72 km) long river in King County and Snohomish County in the U.S. state of Washington. The river's three main tributaries are the North, Middle, and South Forks, which drain the west side of the Cascade Mountains near the town of North Bend and join near the town of Snoqualmie just above the Snoqualmie Falls. After the falls the river flows north through rich farmland and the towns of Fall City, Carnation, and Duvall before meeting the Skykomish River to form the Snohomish River near Monroe. The Snohomish River empties into Puget Sound at Everett. Other tributaries of the Snoqualmie River include the Taylor River and the Pratt River, both of which enter the Middle Fork, the Tolt River, which joins at Carnation, and the Raging River at Fall City.

Olallie State Park

Olallie State Park is a public recreation area featuring multiple waterfalls located five miles (8.0 km) southeast of North Bend, Washington. The state park spans a 3.5-mile (5.6 km) stretch along the South Fork of the Snoqualmie River. The most prominent feature of the park is 135-foot-high (41 m) Twin Falls.

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See also

Run-of-the-river hydroelectricity hydro power station with no or only very small reservoir for storage

Run-of-river hydroelectricity (ROR) or run-of-the-river hydroelectricity is a type of hydroelectric generation plant whereby little or no water storage is provided. Run-of-the-river power plants may have no water storage at all or a limited amount of storage, in which case the storage reservoir is referred to as pondage. A plant without pondage is subject to seasonal river flows, thus the plant will operate as an intermittent energy source. Conventional hydro uses reservoirs, which regulate water for flood control and dispatchable electrical power.

Middle Twin Falls waterfall

Middle Twin Falls is a waterfall on the South fork of the Snoqualmie River.

Upper Twin Falls waterfall

Upper Twin Falls is a 45-foot (14 m) waterfall on the South Fork of the Snoqualmie River.

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The Snoqualmie Falls Hydroelectric Plant is located just north of Snoqualmie in King County, Washington state, US. It is situated about 22 mi (35 km) east of Seattle. Located just below the Snoqualmie Falls, the power plant consists of two power houses, Plant 1 and Plant 2. Plant 1 was completed in 1899 and is located underground. It is the first completely underground hydroelectric power plant ever built in the world. Plant 2 was built in 1910 and is located along the right bank of the Snoqualmie River. Both plants receive water from a small reservoir created by a weir atop the falls. Plant 1 has an installed capacity of 13.7 MW and Plant 2 a capacity of 40.2 MW for a total installed capacity of 53.9 MW, enough to power 40,000 homes.

References

  1. "Twin Falls". Geographic Names Information System . United States Geological Survey.
  2. "Twin Falls (Waterfalls of the Pacific Northwest)".
  3. "Twin Falls Hydroelectric Project". Archived from the original on 2016-03-04.