of Salt Creek is channeled into storm drain K01P07, which ends about 1/2 mile to the northeast of the original source at 33.52508, -117.68814. The various storm drains and the obliteration of the original source have in effect moved the source to an area completely under the street of Marina Hills. In addition, the flow of the stream is almost entirely urban runoff during dry seasons. This is evidenced by a constant annual flow, albeit low, which is low in life and the fact that it is choked with stringy algae, the growth of which is stimulated by nitrates from yard fertilizer. Also as a result of this intense channelization, Salt Creek has no surface tributaries and is inhospitable for all but the smallest mosquito fish and tadpoles. Oftentimes, there are soap suds visible on the water's surface, originating from the many residential and commercial entities in the watershed. History Like other Orange County creeks south of Aliso Creek and north of San Mateo Creek, the Salt Creek watershed was once part of the territory of the nomadic Acjachemen Native American group, which was later renamed the Juaneño by Spanish missionaries when they founded Mission San Juan Capistrano at the confluence of San Juan and Trabuco Creeks farther south, close to the group's main population center. It is possible that Juaneño villages once were located along the lower channel of Salt Creek, as springs feeding the creek provided a small but stable year round flow. By the 1960s, residential development had filled most of the available land within the Salt Creek watershed. Mountaintops were flattened and dumped into small canyons to create level land for tract housing and roads. Despite that, the Salt Creek Canyon remained relatively undeveloped, except for a golf course - the Monarch Beach Golf Links - at its southern end, and a golf course surrounding the Arroyo Salada Storm Channel's mainstem. As recently as the 1970s, the lowermost stretch of the Salt Creek Canyon was still in existence. This part of the canyon was also destroyed by landfill for the purpose of building more houses and the Pacific Coast Highway. Pollution and treatment The Salt Creek watershed is heavily developed, and as a result, it has been heavily impacted by polluted urban runoff. Prior to the construction of the Salt Creek Ozone Treatment Plant in 2004, at least flowed freely into the ocean, which caused a