Koi Nation's $600M Sonoma Casino Stays Stalled After Court Ruling
A federal judge faulted who signed the approval, not just what it said — and Interior has moved to pull the parcel back out of trust.
Nine months after a federal judge halted it, the Koi Nation's proposed Shiloh Resort & Casino in Sonoma County remains stuck — a roughly $600 million project with federally approved plans, graded ground, and no legal path to break ground. The standstill is one of the clearest illustrations this year of how fragile an off-reservation gaming approval can be, and of how much a single procedural defect can cost a tribe that thought it had cleared the hardest hurdle.
The dispute centers on a vineyard parcel near Windsor, north of Santa Rosa, that the U.S. Department of the Interior placed into federal trust for the Koi Nation so the small, landless tribe could build a resort casino. In September 2025, Judge Rita F. Lin of the U.S. District Court for the Northern District of California vacated that trust decision and sent the matter back to Interior. The federal government has since moved to take the land out of trust, unwinding the status that made the entire project possible.
What the court found
The ruling turned on two separate problems, and the first was almost entirely procedural. The judge found that the final approval had been signed by a Bureau of Indian Affairs official who lacked the legal authority to make the call. Under federal law, decisions of this consequence rest with the Secretary of the Interior, a Senate-confirmed officer, or with someone validly exercising the Secretary's delegated authority — not, the court concluded, the official who actually signed off here. That defect alone was enough to undo the decision, independent of the project's merits.
The second problem cut deeper into the tribe's claim to the site. To take off-reservation land into trust for gaming, Interior generally must connect the parcel to a tribe's history and circumstances; the analysis runs through the Indian Gaming Regulatory Act's restrictions on gaming on newly acquired lands, the contours of which we lay out in our explainer on land into trust and Section 20. The Koi Nation pointed to old census records, historical trade routes, and patterns of seasonal work to tie itself to the Windsor area. The court found that evidence too thin to establish that the Shiloh site was truly part of the tribe's ancestral homeland.
A neighbor's opposition and an uncertain road back
The Koi Nation has not been fighting alone, and neither has its opposition. The Federated Indians of Graton Rancheria, which operates the billion-dollar Graton Resort & Casino in Rohnert Park roughly 15 miles from the proposed site, has been among the project's most determined opponents. Inter-tribal opposition of this kind — one gaming tribe contesting another's expansion into nearby territory — has become a recurring feature of California's crowded market, and it adds a political dimension that pure permitting fights lack.
The decision was undone not because the casino was unwelcome, but because the wrong official signed the paperwork and the historical record was judged too thin. Both are fixable in theory; neither is quick.
For now, the tribe has signaled it intends to keep its presence on the land. Earlier this year, with the casino's status unresolved, the Koi Nation said it was proceeding with tribal offices on the vineyard property — a way to maintain a foothold even as the gaming question hangs. But the route back to a casino is steep. Interior would need to revisit the trust acquisition with a properly authorized decision-maker and a stronger record tying the tribe to the land, and any new approval would almost certainly draw fresh litigation from the same opponents.
The Koi Nation's predicament is not unique. Across the West, several off-reservation casino proposals are tied up in court at once, from the Scotts Valley Band's project in Vallejo to other contested fee-to-trust acquisitions. What links them is a shared vulnerability: approvals that look final can be unwound years later on grounds as narrow as who held the pen. We examined that broader pattern in our analysis of fee-to-trust reversals and off-reservation risk, and the Koi case is now its sharpest example.
The economic stakes for the Koi Nation are large precisely because the tribe has so little to fall back on. As a federally recognized but historically landless nation, it has no established reservation casino generating revenue while the Shiloh fight drags on, which is part of why off-reservation acquisition was the strategy in the first place. A destination resort in the wine country north of San Francisco would have been transformative; its indefinite delay leaves the tribe carrying the costs of a stalled project without the income it was meant to produce. That asymmetry — enormous sunk effort, no operating revenue — is the quiet penalty that procedural reversals impose on smaller tribes.
The lesson for tribes weighing similar projects is sobering. Off-reservation gaming offers a path to economic self-sufficiency for nations without usable trust land, but the legal foundation beneath these projects is only as solid as the weakest link in a long administrative chain. For the Koi Nation, that chain broke after the bulldozers had already arrived — and rebuilding it will take far longer than anyone involved once expected.