Adobe Creek Upper Reach 5 Restoration

Abstract:

To restore the creek through the repair of the eroded channel, stabilize banks using geomorphic design principles, remove accumulated sediment, replace existing hardscape creek-lining with biotechnical slope stability measures where needed, improve fish passage, and improve the channel conveyance capacity, while continuing to allow for overland flows during flood events.  The project provides flood protection to approximately 50-years, based on community desires to not construct a 1% conveyance project.  The project will reduce the extent and quantity of overland flooding on the site. 

Purpose: Adobe Creek has a long history of flooding, with flood damages occurring in 1952, 1955, 1983, 1986, 1995, and 1998. The creek has problems such as localized flooding, creek bank erosion, failing channel stabilization structures, sedimentation, barriers to fish passage, and insufficient maintenance access. The project objectives are: 1. Correct the existing erosion to protect residences and creekside structures and stabilize creek banks . 2. Open Upper Reach 5 to eliminate backwater effects in Reach 6 by providing a scaled-down project (i.e., less than one-percent flood protection) to a level of flooding acceptable to the Collaborative and derived from the concept of a restored creek that recognizes landowner constraints. 3. Protect and enhance the creek ecosystem.

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