This sources sought notice is for market research only on a potential USACE design-bid-build Grand Island Mitigation Project in Sacramento County, California, at the confluence of the Sacramento River, Steamboat Slough, and Cache Slough, with an anticipated posting date of October 9, 2026. The project would restore a 233-acre site by creating about 84 acres of aquatic/riparian habitat through roughly 108,000 cubic yards of excavation for a tidal channel network, habitat bowl with islands/peninsulas, berm breach, temporary 250-foot steel sheet pile cofferdam, bioengineered bank stabilization, and revegetation/elderberry shrub transplanting. The estimated construction magnitude is $15,000,000–$20,000,000, and the potential firm-fixed-price solicitation is anticipated around late November 2026 with award by mid-March 2027. Construction is estimated at 665 calendar days from Notice to Proceed, with in-water work restricted to July 1–October 31. Capability statements are sought from firms with relevant experience, bonding, and capacity; the anticipated NAICS is 562910 (Remediation Services) with a $25.5 million small-business size standard.