Reclamation District 1601 Twitchell Island - Three Mile Slough Emergency Repair

Reclamation District 1601 is preparing to address an urgent structural failure on the levee along Three Mile Slough on Twitchell Island in California, where a large sinkhole has developed and is rapidly expanding due to sediment being carried away by water flow through the levee. The emergency repair effort will involve extensive excavation to remove compromised material, followed by stabilization techniques and the placement and compaction of new levee material to restore structural integrity and prevent further degradation. This action is critical to maintaining flood protection and ensuring the long-term functionality of the levee system. The project is being managed by Tessa Marlow, Environmental Manager, who can be reached at tmarlow@ksninc.com or by phone at 209-946-0268, and was posted as a forecast on June 30, 2025, underscoring the urgency and time-sensitive nature of the repair.