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Aliso Creek (Spanish for " Alder Creek"; also called Alisos Creek ) is a 19-mile (31 km)-long urban stream that runs through Orange County in the U.S. state of California from the Santa Ana Mountains to the Pacific Ocean, collecting seven main tributaries. The creek is mostly channelized, and as of 2004, the 30.4-square-mile (78.7 km 2 ) watershed had a population of 149,000 divided among seven incorporated cities. 
Pollution, floods and development of the watershed and the surrounding county have blighted the water quality and wildlife of the creek since the 1960s,  when residential suburban development of the eight cities in the watershed began.  Pollution continues to be a major problem for the creek—the subject of many water quality and feasibility studies—but, as with many other Orange County streams, little has been done to correct it. 
The largest flow recorded at the Laguna Beach streamflow gauge was 5,400 cubic feet per second (150 m 3 /s) with a water depth of 11.3 feet (3.4 m) on March 1, 1983.  The 1983 flood was caused by an El Niño event causing heavy runoff from the overdeveloped watershed. Damage was worst at the mouth of Aliso Canyon, which contains the Aliso Creek Inn and several other structures.  On February 16, 1986, 2,880 cubic feet per second (82 m 3 /s) was recorded, and 2,870 cubic feet per second (81 m 3 /s) was recorded on October 1, 1983.