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      Jackson Lake Dam is a concrete and earth-fill dam in the western United States, at the outlet of Jackson Lake in northwestern Wyoming. The lake and dam are situated within Grand Teton National Park in Teton County. The Snake River emerges from the dam and flows about eight hundred miles (1,300 km) through Wyoming, Idaho, Oregon, and Washington to its mouth on the Columbia River in eastern Washington.
      The chief purpose of the dam is to provide water storage for irrigation in the Snake River basin in the state of Idaho as part of the Minidoka Project. Jackson Lake is a natural lake, but its depth was increased by the dam to provide water storage.


      History


      The first Jackson Lake Dam was a log-crib dam constructed in 1906–07 across the outlet of Jackson Lake, a natural lake. That dam raised the lake level by 22 feet (6.7 m), but the dam failed in 1910. A new concrete and earthen dam was constructed in stages between 1911 and 1916, raising the maximum lake level to thirty feet (9 m) above the lake's natural elevation, providing a storage capacity of 847,000 acre-feet (1.0 billion cubic metres). The new dam was designed by Frank A. Banks, who would later supervise the construction of Grand Coulee Dam.
      The reservoir was created by damming the outlet of the natural glacial Jackson Lake, with the additional height creating a storage pool for the Minidoka Project, which provides irrigation water from the Snake River for farmlands in Idaho. Jackson Lake stores and releases water which is collected by Minidoka Dam and American Falls Dam more than one hundred miles (160 km) downstream for diversion to distribution canals. At the time of the dam's construction, Jackson Hole and the Teton Range were as yet unprotected from development. Grand Teton National Park was established in 1929, and excluded Jackson Lake.
      The lake was incorporated into Jackson Hole National Monument when it was proclaimed by President Franklin D. Roosevelt under the Antiquities Act, and became a part of Grand Teton National Park in 1950 when the park was expanded to encompass the national monument lands. When the dam was built there was no attempt to clear the shores of the lake of standing timber, resulting in an unsightly band of dead trees when the waters rose. This vista, and the mudflats created by drawdown of lake waters, were cited in later years in successful arguments against reservoirs in Yellowstone National Park.
      Construction personnel for the dam were housed at a temporary camp that dwarfed the nearby town of Moran. Supplies came in from the Grassy Lake Road north of the park, which runs west into Idaho to meet the nearest railhead at Ashton, Idaho.


      Reinforcement


      The U.S. Bureau of Reclamation conducted studies on dams in 1976 and determined that Jackson Lake Dam was susceptible to failure in case of an earthquake of magnitude 5.5 or greater. Following the Borah Peak earthquake of 1983 in Idaho, the dam was upgraded during 1986–1989, and the Bureau of Reclamation believed it could withstand the "maximum credible earthquake," a magnitude 7.5 quake on the Teton fault. Since then various studies have cast doubt on this belief.


      Dam facts and figures


      The dam is owned and operated by the U.S. Bureau of Reclamation, which maintains the water level above the lake's natural elevation for downstream irrigation.

      Type: Concrete gravity dam with earthen embankment wings
      Drainage area: 1,824 square miles (4,724 km2)
      Lake elevation:
      Normal full pool: 6,760 feet (2,060 m)
      Maximum pool: 6,769 feet (2,063 m)
      Minimum pool: 6,730 feet (2,050 m)
      Maximum water surface: 6,770.3 feet (2,063.6 m)
      Usable storage (6730–6760 ft): 847,000 acre⋅ft (1.0 billion m3)
      Crest elevation: 6,777 feet (2,066 m)
      Crest length: 4,920 feet (1,500 m)
      Crest width: 24 feet (7.3 m)
      Base width: 72 feet (22 m)
      Structural height: 65 feet (20 m)











      See also


      List of dams in the Columbia River watershed


      References




      External links



      U.S. Bureau of Reclamation: Jackson Lake Dam
      U.S. Bureau of Reclamation: Minidoka Project
      University of Wyoming: The Operation and Management of Jackson Lake Dam
      U.S. Army Corps of Engineers: Jackson Lake Dam and Lake Hydrologic Data
      U.S. National Park Service: The Snake River: Responses to Jackson Lake Dam Archived August 3, 2007, at the Wayback Machine (PDF)[link expired]

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    Jackson Lake Dam - Wikipedia

    Jackson Lake Dam is a concrete and earth-fill dam in the western United States, at the outlet of Jackson Lake in northwestern Wyoming. The lake and dam are situated within Grand Teton …

    Jackson Lake Dam Overlook - U.S. National Park Service

    Apr 5, 2024 · Jackson Lake is a 400 foot-deep natural lake with a dam added on top. The original log-crib dam constructed in 1906-07, failed in 1910. In 1916, the Bureau of Reclamation …

    Jackson Lake Dam Operations, PN Region - Bureau of Reclamation

    Jackson Lake Dam, a temporary rockfilled crib dam was completed in 1907 by Reclamation at Jackson Lake to store 200,000 acre-feet for the Minidoka Project until the storage …

    Jackson Lake Dam, Snake River in Grand Teton Park - AllTrips

    Jackson Lake Dam is located 30 miles north of Jackson Wyoming in Grand Teton National Park. The Dam was built at the mouth of the naturally formed Jackson Lake to increase the volume …

    Jackson Lake (Wyoming) - Wikipedia

    Jackson Lake is in Grand Teton National Park in northwestern Wyoming. [3] This natural lake was enlarged by the construction of the Jackson Lake Dam, which was originally built in 1911, …

    Bureau of Reclamation

    Bureau of Reclamation - Managing water and power in the West

    As flows from Jackson Lake Dam fall, scientists, citizens will ...

    Sep 19, 2024 · Over four days, scientists and river runners will study the impacts. In the fall of 2021, the Bureau of Reclamation proposed slashing flows from Jackson Lake Dam, prompting …

    Jackson Lake Dam - History Jackson Hole

    At Jackson Lake, the Reclamation Service built the dam with the intention of controlling lake levels for irrigation on farmlands on the Snake River in Idaho. With a growing population, Moran …

    Jackson Lake Dam - Alert Data

    Feb 16, 2025 · The Jackson Lake Dam is an earth-fill structure, which means it is primarily composed of compacted earth and rock. This type of dam is known for its stability and ability to …

    Home - Jackson Lake Dam

    Jackson Lake, covering an area in excess of 25,000 acres, is used to store water for irrigation in the Snake River Valley of central Idaho. The dam is operated by the US Bureau of …