Willson v. Black-Bird Creek Marsh Co., 27 U.S. (2 Pet.) 245 (1829), was a significant United States Supreme Court case regarding the definition of the Commerce Clause in Article 1 sec. 8, cl. 3 of the U.S. Constitution.

Background

Willson, the owner of a sloop who was licensed under federal navigation laws, the Sally, broke through a dam that blocked his passage which was built by the Black-Bird Creek Marsh Co. and had been authorized to do so by Delaware law. The company brought a case against Willson, claiming Delaware authorized the building of the dam on the Blackbird Creek through a law which was passed under the police power of the state in order to clean up a health hazard and there was no legislation by Congress dealing with the same subject matter. Willson claimed that the law authorizing the building of the dam was a violation of the commerce clause. He believed he had a constitutional right to navigating coastal streams and Delaware's actions were motivated by private profits.

Opinion

Chief Justice John Marshall affirmed the lower court's decision, that because no federal law dealt specifically with the situation, and the state law did not violate Congress' Dormant Commerce Clause power, the state law was valid. He did note, however, that the dam might interfere with interstate commerce.