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The area that now comprises the refuge was once enveloped by an enormous inland lake know today as Lake Bonneville. This great body of water rose and fell several times during its 16,000 year existence. The prominent shorelines where water levels stabilized for extended periods are visible on the mountains in the area. When Lake Bonneville was at its peak level, the water in the area that is now marsh would have been nearly 850 feet deep. The lake declined to a level below the present marsh level around 14,000 years go.
The History of Fish Springs National Wildlife Refuge started with early evaluation in 1934 and finally purchase and construction starting in 1959.
Last Updated: March 22, 2010