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Course of San Juan Creek
San Juan Creek is a creek in Orange County in the U.S. state of California. It is about long, and along with its major tributary, Trabuco Creek, drains near the southernmost extent of Orange County. This article describes the course of San Juan Creek.
==Headwaters to San Juan Canyon==
San Juan Creek begins in the southern Santa Ana Mountains, a few miles northwest of Lake Elsinore. Its highest elevation is above sea level. Paralleling the Ortega Highway (California State Route 74) the creek flows erratically south, west and occasionally northwest. In the furthest upper reaches of the watershed, the creek is typically ephemeral. The creek channel in the uppermost few miles is a narrow mountain stream with many rapids and waterfalls, which include a series of large cascades, known as San Juan Falls.〔Shaffer, Chris. ''The Definitive Guide to the Waterfalls of Southern and Central California.'' Shafdog Publications, 2005. pp. 379–380.〕 There are little alluvial deposits in the canyons, and the creek mostly cascades over bedrock. In this upper reach, the pool-and-riffle stream channel structure is evident. There are a few developments within the area, but most of the canyon is too narrow for development, and the only major structure that influences the creek throughout San Juan Canyon is Ortega Highway, which follows the course of the entire canyon.〔
Leaving its uppermost headwaters, San Juan Creek flows south and west in several meanders, then finally proceeds to flow west-southwest. It is joined by the ephemeral watercourses Long Canyon and Morell Canyon on the right bank, and Bear Canyon on the left bank. At about this reach, it plunges over San Juan Falls, a drop; the falls is preceded by a short cascade and followed by a series of near-vertical falls. In this reach, stream pools, which tend to become stagnant during low flow periods, are abundant. Continuing on down the gradually widening valley, San Juan Creek turns westwards and drops over several more falls, before finally widening to about . Just below the falls, a small perennial watercourse trickles into San Juan Creek on the left bank.〔
About below the falls, deposits begin to become apparent on the floor of the widening valley, and the creek spreads out, with short reaches of cascades between slackwater pools and more gradual courses. After flowing through this approximately valley, it narrows again to a steep canyon, receiving Lion Canyon on the right bank. It is crossed by the first major bridge, a stone arch bridge carrying Ortega Highway. After the bridge, the creek is joined by Hot Springs Creek on the right bank, which is fed by the San Juan Hot Springs; Cold Springs Creek meets San Juan Creek only about downstream, also on the right bank. About past Cold Springs Creek, Lucas Canyon Creek joins on the left bank.〔〔〔
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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