Illinois Ex Rel. Dunne v. Economy Light & Power Co.

Background

The State of Illinois, acting through its Governor and Attorney General, sued Economy Light & Power Company to stop construction of a dam across the Des Plaines River, claiming the river and its bed were public and that earlier canal trustees had no authority to convey riverbed rights. The company relied on deeds, leases, and contracts from canal authorities and asserted long expenditures and plans approved in consultation with federal engineers.

Reasoning

The central question was whether a federal issue existed that would allow this Court to review the Illinois courts’ decision. The Illinois Supreme Court examined extensive evidence and found the river was not navigable in its natural state, that added water from the Chicago sanitary works did not turn it into a federally protectable navigable waterway, and that state legislative declarations could not override private property protections without compensation. The United States Supreme Court concluded those determinations were factual and based on state law, and the federal statutes cited were appropriations or possible future projects, not an exercised federal jurisdiction that would save the federal case.

Real world impact

Because no federal question remained, the federal writ was dismissed and the state courts’ rulings stand. That leaves the canal deeds, leases, and contracts enforceable and the State without relief in this case unless Congress later takes clear jurisdiction or authorizes improvements. The decision emphasizes that factual navigability findings and state property disputes are typically for state courts unless a concrete federal law or federal action creates a reviewable federal right.