The issue is not that 52 plans were missing

The U.S. Army Corps of Engineers sent 74 proposed water-resources project reports to Congress from 2020 through 2025. Twenty-two required mitigation plans. Fifty-two did not—70.3% of the total.

A new Government Accountability Office review did not conclude that all 52 reports were unlawfully missing plans. Instead, it found that reports generally failed to document clearly that mitigation was unnecessary and explain the basis for that determination. That distinction matters: incomplete reasoning is an oversight weakness, not proof of unaddressed environmental harm.

What’s the Scoop With Broach calculated the proportions from GAO’s full project count. The public-interest question is whether Congress can tell from a report that the Corps considered fish and wildlife effects, decided a plan was unnecessary, and had record support for that decision.

Corps reports submitted to Congress, 2020–2025.
Report groupCountShare
Mitigation plan required2229.7%
No plan required5270.3%
Total reviewed74100%

Technical material is not the same as an explicit decision record

The Corps said its reports contained sufficient technical information and did not agree that new guidance was necessary. Its position is that readers can derive the environmental determination from the analysis already included in project documents.

GAO disagreed. It recommended guidance requiring reports to state whether a mitigation plan is needed and, when it is not, to explain why. That creates a simple audit trail and prevents congressional reviewers from reconstructing a decision from scattered technical sections.

The difference is substantive. A transparent no-plan decision can be evaluated and challenged. An implicit decision makes it harder to know whether an effect was considered, found insignificant, avoided through project design or omitted.

What the review cannot prove

GAO’s finding applies to the clarity of the reports it reviewed. It does not establish that the 52 projects caused unmitigated damage, that every technical conclusion was wrong or that Congress would have rejected any proposal with better wording.

The six-year universe is also limited to reports submitted to Congress and reviewed under the statutory framework GAO describes. It is not a census of every Corps permit, maintenance action or emergency response.

This analysis contributes the plan/no-plan shares and preserves the agency’s disagreement. The recommendation is testable: future reports either will or will not state the determination and rationale in a consistent place. No interviews were conducted.

Sources and further reading

GAO-27-108551 — Water Resources Projects: Corps Should Better Document Mitigation Determinations, October 8, 2026 ↗

Photograph source and Army public-domain notice ↗