PROVIDENCE — The long-running legal feud over plans by Champlin’s Marina to expand in Block Island’s Great Salt Pond is going to the state Supreme Court, potentially making it one of the biggest Rhode Island coastal battles in decades.

The high court Tuesday agreed to hear appeals from the Conservation Law Foundation, the state Coastal Resources Management Council and island conservation groups. It also continued a stay it previously issued that blocks the marina from going ahead with any expansion work this summer.

The case will not be resolved quickly. The court issued a series of deadlines for filing briefs through the summer and assigned oral arguments to its Sept. 29 calendar. Acting Justice Maureen McKenna Goldberg, whose husband, Robert, is representing Champlin’s, did not participate.

The appeals are in response to a ruling by Superior Court Judge Netti C. Vogel last February that disqualified three members of the coastal council for what she called inappropriate behavior and effectively approved the controversial expansion by a vote of 4 to 3. Previously, the council rejected the expansion in a tie vote.

Champlin’s has been trying to get the expansion approved for six years.

Three separate appeals were filed by the council and its chairman, Michael Tikoian; The Block Island Land Trust; the Committee for Great Salt Pond, the Town of New Shoreham and the Block Island Conservancy; and the Conservation Law Foundation.