Tennessee Valley Authority v. Hiram Hill et al., or TVA v. Hill, 437 U.S. 153 (1978), was a United States Supreme Court case and the Court's first interpretation of the Endangered Species Act of 1973. After the discovery of the snail darter fish in the Little Tennessee River in August 1973, a lawsuit was filed alleging that the Tennessee Valley Authority (TVA)'s Tellico Dam construction was in violation of the Endangered Species Act. Plaintiffs argued dam construction would destroy critical habitat and endanger the population of snail darters. It was decided by a 6-3 vote, in which the U.S. Supreme Court ruled in favor of Hill, et al. and granted an injunction stating that there would be conflict between Tellico Dam operation and the explicit provisions of Section 7 of the Endangered Speci