Emergency Estudillo Canal (Zone 2 Line A) Channel Wall Temporary Stabilization, Between I-880 Freeway and Fargo Avenue, in San Leandro, Alameda County.
The Alameda County Flood Control and Water Conservation District (District) owns and maintains Estudillo Canal (also known as Zone 2 Line A). The Estudillo Canal was constructed in the early 1960s. Much of the existing channel is concrete lined with either inclined or vertical concrete channel walls and bottom. During heavy rains on December 31, 2022, an approximately 170 foot section of vertical concrete channel wall, along the west side of the channel, collapsed unexpectedly just downstream of Manor Boulevard behind the backyards of 15008, 15016, 15024, and 15032 Crosby Street. Heavy rains continued on January 1, 2023, in which an approximately 90 foot section of vertical concrete channel wall, along the west side of the channel, collapsed unexpectedly behind the backyards of 15072, 15080 and 15092 Crosby Street. Between rain storm events, the District’s maintenance and operations staff removed fallen loose debris to minimize channel blockage and installed visqueen plastic sheets weight down by sandbags to temporarily minimize further erosion of exposed banks in the backyards of several homes. Additional emergency measure will need to be taken as soon as practicable after the series of storm events. The proposed emergency channel wall stabilization includes fabrication of steel support brackets to be fastened to the vertical channel walls and connected to the temporary steel struts to be installed above the top of channel wall, along the portions of existing vertical concrete channel walls experiencing leaning condition. The implementation of these temporary support bracings would minimize further catastrophic vertical channel wall failure.