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Greer Spring
Greer Spring is a first magnitude spring located in the southeast portion of the Ozark Plateau, in Oregon County in south-central Missouri within the boundaries of the Mark Twain National Forest. The spring is the second largest spring in the Ozarks, with an average discharge of of water per second.〔 Greer Spring was designated a National Natural Landmark in 1980.
==The Spring Outlet==
The spring emerges at the bottom of a narrow chasm. An upper outlet flowing from a cavern is only a fraction of Greer Spring's large flow. About downstream (north) the main outlet boils to the surface in a mixture of deep, aqua-blue water, moss covered rocks, and frothy whitewater. The newly-formed surface stream then races down a small, steep, hardwood blanketed gorge dropping in elevation for to its confluence with the Eleven Point River. Greer Spring greatly increases the flow of the river, ensuring ample water for recreational activities, such as boating, even in the dry months. The vast amount of spring water changes the Eleven Point River into a coldwater stream for several miles downstream. The spring's cold water also creates ideal conditions for trout. The mouth of the spring branch is roughly 0.5 miles upstream (west) of the Missouri Route 19 bridge over the Eleven Point River. Greer Spring may be the most secluded and undisturbed big spring in the Ozarks. The spring has been owned by the U.S. National Forest Service since 1993.〔http://www.fs.fed.us/r9/forests/marktwain/recreation/sites/greer_spring/〕 Before 1993 the spring was in the caring hands of private ownership. The area surrounding the spring has been retaken by nature, but had a small fish hatchery and roads many years ago, the site has remained very scenic and unspoiled.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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