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Mill Creek is a stream in San Bernardino County, California. It is a major tributary of the Santa Ana River. Their confluence occurs just downstream of the upper Santa Ana Canyon mouth. Part of the creek flows through San Bernardino National Forest. Mill Creek is in much better condition than the lower portions of the Santa Ana watershed, as its drainage area is less urbanized. However, the creek has three hydroelectric plants owned by Southern California Edison. The streambed is completely dewatered in some places. Also, a levee system was built by the United States Army Corps of Engineers after a severe flood, which degraded the riparian habitat. In addition, the poor conditions downstream interfere with fish migration to the creek.
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