Sherman Island Reclamation District 341
Reclamation District 341 was formed by petition and order on June 17, 1879. The formation included the reorganization of Districts 54 and 252.
The Sherman Island levee system is maintained by Reclamation District 341. It consists of approximately 19.5 miles of levee: 6.4 miles along the Sacramento River, 3.3 miles along Threemile Slough, 6.6 miles along the San Joaquin River, and 3.2 miles along Mayberry Slough.
The island has been identified as high priority in the Delta due to its geographical location, which influences the salinity and water quality within the Delta.