Title 33 › CHAPTER 9 — PROTECTION OF NAVIGABLE WATERS AND OF HARBOR AND RIVER IMPROVEMENTS GENERALLY › SUBCHAPTER VII — DAM INSPECTION PROGRAM › § 467n
After November 17, 1986, the Secretary must recover the costs of safety upgrades to dams and related facilities that are done because of new hydrologic or earthquake data or new design or construction standards. Fifteen percent of those modification costs is treated as project costs and split among project purposes using the project's current cost rules. Non‑Federal partners pay their share the same way they did when the project was first built. Irrigation costs are repaid under Public Law 98–404. Except for irrigation, costs may be repaid with interest over up to 30 years from completion. The Treasury Secretary sets the interest rate using average market yields on U.S. marketable securities with similar remaining maturities from the month before the fiscal year when the cost was incurred, plus a premium of one‑eighth of one percentage point; if more than one rate applies, a weighted average is used. This does not change the Secretary’s authority or cost sharing for work under Public Law 84–99 (33 U.S.C. 701n).
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Navigation and Navigable Waters, Source: USLM XML via OLRC
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Reference
Citation
33 U.S.C. § 467n
Title 33, Navigation and Navigable Waters
Last Updated
Aug 21, 2026
Release point: 119-102