In Hess v. United States, the Government was held liable for the death of a workman who was participating in the repair of the Bonneville Dam on the Columbia River, though the district court found that the Government was in no way negligent.
Gordon G. Conger,
Recent Federal Decisions,
United States Held Liable Without Proof of Negligence under the Federal Tort Claims Act,
36 Wash. L. Rev. & St. B.J.
Available at: https://digitalcommons.law.uw.edu/wlr/vol36/iss2/15