“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Yosemite National Park in Mariposa County, California — The American West (Pacific Coastal)

A Seasonal Lake

A Seasonal Lake Marker image. Click for full size.
By Eric Polk, June 2008
1. A Seasonal Lake Marker
Click on photo to view graphics and captions displayed on marker.
Inscription. Mirror Lake was once regarded by park scientists as a stream-fed lake slowly filling in to become a meadow. As hydrologists have developed a more complex understanding of the water's dynamics, they now theorize that the "lake" is a pool in a seasonal stream. Changes in the volume and speed of the stream's water cause sand to be deposited in and scoured from the pool in cycles.

Rockfall Changes
The rockfall that created Mirror Lake altered the streamside habitat of Tenaya Creek. More aquatic and streamside plants took hold in the pooled water and saturated soils. These plants, in turn, are habitat for ducks, frogs, and other aquatic species that prefer still water.

Endangered Species Habitat
The cliffs and rocky crevices looming above Mirror Lake are prime nesting spots for peregrine falcons and spotted bats, two of the park's endangered species. Swifts and swallows also roost there, feeding on insects that thrive in the pooled water. Peregrine falcons prey upon the insect-eating birds.
Erected by Yosemite Fund.
Location. 37° 44.894′ N, 119° 32.981′ W. Marker is in Yosemite National Park, California, in Mariposa County. Touch for map. The marker is located
<i>Mirror Lake, Yosemite Valley.</i> image. Click for full size.
Photochrom postcard by the Detroit Photographic Company, 1898
2. Mirror Lake, Yosemite Valley.
Image courtesy of the Yale Collection of Western Americana, Beinecke Rare Book and Manuscript Library.
along the Mirror Lake Trail. Marker is in this post office area: Yosemite National Park CA 95389, United States of America.
Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies. Bracken Fern and Baskets (within shouting distance of this marker); Visitors at Mirror Lake (about 300 feet away, measured in a direct line); Selling the Sublime (about 300 feet away); Mirror Lake Resources (about 500 feet away); Natural Dam (about 600 feet away); The Ahwahnee Porte Cochere (approx. 1.3 miles away); The Grand Lodge (approx. 1.4 miles away); LeConte Memorial Lodge (approx. 1.7 miles away). Touch for a list and map of all markers in Yosemite National Park.
Categories. AnimalsEnvironmentWaterways & Vessels
Credits. This page was last revised on June 16, 2016. This page originally submitted on March 26, 2015, by Eric Polk of Lakewood, California. This page has been viewed 235 times since then and 17 times this year. Photos:   1. submitted on March 26, 2015, by Eric Polk of Lakewood, California.   2. submitted on September 1, 2015. • Syd Whittle was the editor who published this page.
Editor’s want-list for this marker. Wide area view of the marker and its surroundings. • Photo of Mirror Lake. • Photo of cliffs and rocky crevices. • Can you help?
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