S. 3743 — A bill to direct the Secretary of the Interior to carry out a feasibility study on a selective water withdrawal system at Glen Canyon Dam, and for other purposes.

This section directs the Secretary of the Interior, acting through the Bureau of Reclamation and in consultation with the Secretary of Energy and Colorado River Storage Project power contractors, to complete a feasibility study—including hydrological modeling—on a selective water withdrawal system at Glen Canyon Dam within 18 months of enactment. The study is to optimize hydropower generation during cold water releases while preventing entrainment of invasive species, pursuant to the 2016 Long-Term Experimental and Management Plan Record of Decision and the 2024 Long-Term Experimental and Management Plan Supplemental Environmental Impact Statement and Record of Decision. If an alternative is determined feasible under reclamation laws and power contractors concur, the Secretary may proceed with compliance and construction; study costs are to be paid from nonreimbursable federal appropriated funds, with sources identified within 90 days of enactment. The section does not affect post-2026 Colorado River reservoir operations guidelines and strategies for Lake Powell and Lake Mead.