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San Diego Creek
San Diego Creek is a waterway flowing into Upper Newport Bay in central Orange County in the U.S. state of California. Its basin covers in parts of eight cities, including Irvine, Tustin, and Costa Mesa. From its headwaters in Laguna Woods the creek flows northwest to the confluence with Peters Canyon Wash, where it turns abruptly southwest towards the bay. Most of the creek has been channelized for flood control, but it also provides important aquatic and riparian habitat along its course and its tidal estuary.
The watershed is heavily urbanized with master planned residential and commercial development, although there is also agriculture, high-tech industry and of designated open space. The El Toro Marine Corps Air Station, which is being converted into the Orange County Great Park, lies along the tributary Agua Chinon Creek. Interstate 5 and Interstate 405 run southeast-northwest through the watershed, which borders that of Santiago Creek on the northeast, the Santa Ana River on the northwest, and Aliso Creek on the southeast.
==Course==
San Diego Creek rises in the foothills of the Santa Ana Mountains near residential communities of El Toro, and Lake Forest. Most of its upper course is culverted under subdivisions of El Toro and Irvine. It flows northeast, fed by tributaries from northern Laguna Canyon and from the Santa Ana Mountains to the north of the creek. After crossing under Interstate 405 near the Verizon Wireless Amphitheater, the creek enters an artificial channel and receives Serrano Creek via an underground culvert on the right bank. Directly after the confluence, it passes under California State Route 133. It then flows northeast in a nearly straight course through East Irvine and the City of Irvine, receiving Agua Chinon Creek, Bee Canyon Wash, and the Marshburn Channel from the right. All these tributaries originate in the Santa Ana Mountains and are channelized for most of their lengths through Irvine. A few miles past the confluence with Marshburn Channel, San Diego Creek receives its main tributary, Peters Canyon Creek, on the right bank. The creek begins at Peters Canyon Reservoir in the Santa Ana Mountains and runs about south-southwest. Although historically it was a smaller tributary, due to present-day flood control purposes, the channel of Peters Canyon is wider than the channel of San Diego Creek when they join.〔 〕
At the confluence with Peters Canyon Creek, San Diego Creek turns abruptly southwest, flowing underneath Interstate 405 for the second time. After flowing beneath the highway, San Diego Creek enters a series of slackwater pools, known as the San Joaquin Marsh, in the San Joaquin Wildlife Sanctuary.〔.〕 The partially man-made marsh stretches approximately to where San Diego Creek turns abruptly westward. The creek receives Bonita Creek on the left bank just a few hundred yards upstream frow where it empties into Upper Newport Bay, which eventually discharges into the Pacific Ocean.〔〔
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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