S. 1516 Reported by committee Public Lands and Natural Resources

Cahokia Mounds Mississippian Culture Study Act

A bill to authorize the Secretary of the Interior to conduct a special resource study of the Cahokia Mounds, Emerald Mounds, and Pulcher Mounds in the State of Illinois, and for other purposes.

  1. Introduced
  2. Committee
  3. Passed Senate
  4. Passed House
  5. To President
  6. Became law
Sponsor Sen. Durbin, Richard J. [D-IL] Introduced April 29, 2025 Cosponsors 1 (1 D) Latest action July 23, 2026

Summary

Cahokia Mounds Mississippian Culture Study Act
This bill directs the Department of the Interior to conduct a special resource study of an area made up of (1) Cahokia Mounds State Historic Site in Collinsville, IL; (2) the Emerald Mounds in St. Clair County, Illinois; and (3) the Pulcher Mounds in Monroe and St. Clair Counties, Illinois. (The National Park Service uses special resource studies when determining whether to designate sites as National Historical Sites.)
The study must
- evaluate the national significance of the study area;
- determine the suitability and feasibility of designating the study area as a unit of the National Park System;
- consider other alternatives for preservation, protection, and interpretation of the study area by other governmental entities or nonprofit organizations; and
- identify cost estimates for any federal acquisition, development, interpretation, operation, and maintenance associated with such alternatives.
Interior must report on the results of the study and make recommendations to specified congressional committees.

Summary by the Congressional Research Service, Library of Congress.

Congress.gov

Actions

  1. Jul 23, 2026 Placed on Senate Legislative Calendar under General Orders. Calendar No. 478.
  2. Jul 23, 2026 Committee on Energy and Natural Resources. Reported by Senator Lee with an amendment in the nature of a substitute. Without written report.
  3. Feb 4, 2026 Committee on Energy and Natural Resources. Ordered to be reported with an amendment in the nature of a substitute favorably.
  4. Apr 29, 2025 Read twice and referred to the Committee on Energy and Natural Resources. (text: CR S2668)
  5. Apr 29, 2025 Introduced in Senate

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