## Facts

- Pumpelly owned hundreds of acres of farmland near the Fox River, the northern outlet of Lake Winnebago in Wisconsin.
- Before Wisconsin became a state, work began on constructing a dam on the Fox River near the lake; the Green Bay Company later acquired the dam works from earlier developers.
- After statehood, the Wisconsin Legislature adopted the dam plan and passed legislation supporting the dam as part of a public river-improvement project.
- After the dam was completed, water backed up and rose to a level that forcibly flooded Pumpelly’s land.
- Pumpelly alleged the flooding was continuous and destructive, tearing up trees and grass, washing away hay, choking drains and ditches, saturating soil, and depositing sand, and that it destroyed the land’s usefulness and value.
- Pumpelly brought an action for damages (trespass on the case) in federal circuit court against the company.
- The company filed multiple pleas asserting statutory authority for the dam and invoking statutory schemes that it argued governed, and limited, compensation for land injured by dams.
- The circuit court accepted the company’s statutory-defense theory and entered judgment against Pumpelly; Pumpelly sought review in the U.S. Supreme Court by writ of error.

## Issues

1. Whether a plea relying on statutory authority is sufficient when it alleges compliance in general terms rather than alleging specific facts showing the defendant’s conduct stayed within statutory limits.
2. Whether severe and permanent flooding of private land caused by a dam built and operated under legislative authority for a public project is a “taking” requiring just compensation, even without formal acquisition of title or exclusive possession.
3. Whether the flooding injury should be treated as only a remote or consequential harm from a public work, rather than a direct physical invasion equivalent to a taking.

## Decision

- The Supreme Court reversed the judgment for the Green Bay Company.
- The Court held that when a defendant relies on statutory authority as a defense, the plea must allege the facts that bring the conduct within the statute; a general allegation that the water level was kept within what the statute allowed was inadequate, especially where the statute prohibited raising Lake Winnebago above its “ordinary level.”
- The Court held that Pumpelly’s allegations described a direct physical invasion—water backed onto land in a way that destroyed its practical use—and that such permanent, substantial flooding can amount to a taking for which compensation is required.
- The Court rejected a narrow view that the constitutional protection applies only when the government formally appropriates title or physically occupies property in the strictest sense.
- The Court stated that land bordering navigable waters remains within the protection of the just-compensation principle when conveyed without reservation.

## Legal Principles

- A taking does not require formal transfer of title or the government’s exclusive possession; a serious interruption of the common and necessary use of property can be equivalent to a taking.
- Government-authorized backing of water that overflows and permanently injures private land is a taking when it amounts to a direct physical invasion and destroys or substantially impairs the land’s use.
- The doctrine denying compensation for remote or consequential harms from public improvements does not control when the injury is direct, physical, and effectively permanent.
- A statutory-authority defense must be pleaded with specific factual allegations showing compliance with statutory conditions and limits; a conclusory claim of compliance is not enough where the statute contains concrete restrictions.

## Conclusion

Pumpelly held that when a state-authorized dam causes permanent and destructive flooding that destroys the practical use of private land, the injury can constitute a taking requiring just compensation, even though the state or its grantee never formally seized title. The Court also required defendants relying on statutory authority to plead the specific facts showing their conduct fell within the statute’s limits, rather than relying on general assertions of compliance.


Pumpelly v. Green Bay Company, 80 U.S. 166 (1872)