Barranca Channel Maintenance and Improvement (F09)
Barranca Pkwy. to Jamboree Rd. Location: City of Irvine District: Supervisorial District 3
History / Background
The project reach is a trapezoidal earthen channel with intermittent riprap protection and is approximately 7,000 feet in length from Jamboree Road to Barranca Parkway. The channel was incised in the 1970’s by the County. Since then, various development and improvements took place including:
many industrial and residential buildings were constructed along the channel within the City of Irvine;
the downstream reach from Jamboree to the confluence with San Diego Creek (F05) was widened with riprap slope protection on both sides (per record drawing F09-101-3, 1993);
a retarding basin was added upstream in the City of Tustin;
the channel along Barranca Parkway between Red Hill Avenue and 240 feet upstream of Von Karman Avenue/Tustin Ranch Road was replaced with a double barrel RCB by the City of Tustin.
The project was initiated as one of the PL84-99 projects. The project reach has experienced some degree of erosion along the existing earthen and riprap embankments, especially the reach between Alton parkway and Barranca Parkway. USACE failed this channel during their most recent inspection in 2010, thus F09 is not eligible for State, or Federal funds should a disaster occur. Therefore, the objective of this project is to reinstate the facility into the PL84-99 eligible list. The recommended improvement alternative is performing a “Repair-in-Kind” to restore the channel’s as-built condition as an earthen channel between Jamboree Road and Barranca Parkway.
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