Bouldin Island, Agricultural island in Sacramento-San Joaquin River Delta, United States.

Bouldin Island is a 2,400-hectare island in the Sacramento-San Joaquin River Delta, about 12 miles northwest of Stockton on the Stockton Deepwater Shipping Channel. It lies in San Joaquin County and is managed by Reclamation District 756. The South Mokelumne River bounds it to the north, Little Potato Slough to the east, Potato Slough to the south and the Mokelumne River to the west.

The Metropolitan Water District of Southern California acquired the island to establish water management systems in the Sacramento-San Joaquín River Delta. This acquisition marked a major shift in how the island's resources were controlled and used for water supply purposes.

Bouldin Island is owned by the Metropolitan Water District of Southern California and managed by Reclamation District 756, which maintains the levees and drainage that keep the farmland dry. State Route 12, called Kettleman Lane on the island, carries traffic across the northern section.

State Route 12 crosses the northern section of the island, connecting it to Andrus Island via a swing bridge and to Stockton through a high-level bridge. This road provides the main access route for anyone visiting or traveling through the area.

Bouldin Island covers about 2,400 hectares and is owned by the Metropolitan Water District of Southern California, while Reclamation District 756 manages it. State Route 12, called Kettleman Lane on the island, crosses its northern section.