What is so special about Mono Lake?
Unlike most lakes you know, Mono Lake does not drain into a river or ocean. Some water is lost by evaporation, some comes as precipitation, and some flows in as streams and springs. The dissolved minerals stay in the lake, giving it its unique chemistry.
Even under these harsh conditions, Mono Lake supports a surprisingly productive ecosystem. Its waters are home to brine shrimp and alkali flies, which are an important source of food for birds. During migration, the Mono Basin provides feeding and resting areas for millions of migratory birds. One of the things that makes Mono Lake, California, so fascinating is this combination of an extreme environment and abundant wildlife.
The Strange Tufa Towers of Mono Lake
The tufa towers must be Mono Lake’s most recognizable feature. These pale limestone formations rise dramatically from the water and shoreline, creating one of California’s most unusual landscapes. Tufa is formed where springs of freshwater rise from beneath the lake and encounter water rich in carbonate. A chemical reaction deposits calcium carbonate around the spring. The deposits build up slowly over many years into towers and other odd shapes. Many of these formations were underwater for much of their history. As the lake level dropped during the twentieth century, many tufa towers became visible.
Today, the towers are most dramatic in the South Tufa area, where visitors can walk among the natural formations to get a close-up view. Tufa is fragile, so visitors are forbidden to climb on the formations or take pieces from them.
Paoha and Negit: The Volcanic Islands of Mono Lake
Mono Lake is located in a landscape with a long volcanic history. The nearby Mono Basin contains volcanic domes, craters, islands, and other features created by previous eruptions. Paoha Island and Negit Island are the most iconic of Mono Lake’s islands. Paoha is of volcanic origin, having been formed by the uplift of lake sediments. Negit is a cinder-cone volcano. The adjacent Mono Lake Volcanic Field is evidence that the region has been volcanically active during geologic time. This combination of ancient saline lake and volcanic terrain is what gives the Mono Basin its unique character.
Why did Mono Lake become an environmental problem?
The story of Mono Lake is more than simply geology and scenery. It’s also one of California’s most important conservation stories. During the 20th century, Los Angeles diverted many of the streams that naturally fed Mono Lake to provide water for the city. Less freshwater flowed into the lake, and the lake’s water level dropped dramatically. The receding lake raised concerns about wildlife habitat, increasing salinity, exposed lakebed, and the ecological health of the Mono Basin. The dramatic changes became the focus of a major environmental campaign.
In 1978, the Mono Lake Committee formed and helped protect the lake. Mono Lake and its tributary streams were protected in a landmark California water-management decision in 1994 after years of scientific research, public campaigning, and legal action.
Birds and Brine Shrimp at Mono Lake
One of the remarkable surprises of Mono Lake is the number of wildlife species it sustains in such a forbidding environment. The lake has no native fish, but its waters are thick with brine shrimp and alkali flies. These little critters are the bottom of an important food chain.
Birds visiting Mono Lake can discover a tremendous food supply along the shoreline and in surrounding wetlands. The area is particularly important for migratory birds that use the Pacific Flyway, one of the great bird migration routes of North America. The islands of Mono Lake also serve as breeding grounds for California gulls. The lake is an opportunity for birders and nature lovers to see wildlife in a setting quite different from the more familiar coastal and forest environments of California.
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