Cahokia Mounds Mississippian Culture Study Act

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.

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Timeline

1. 29 April 2025

   Introduced

   Read twice and referred to the Committee on Energy and Natural Resources. (text: CR S2668)

   Source: IntroReferral

2. 29 April 2025

   Introduced

   Introduced in Senate

   Source: IntroReferral

3. 4 February 2026

   Reported

   Committee on Energy and Natural Resources. Ordered to be reported with an amendment in the nature of a substitute favorably.

   Source: Committee

4. 23 July 2026

   Calendars

   Placed on Senate Legislative Calendar under General Orders. Calendar No. 478.

   Source: Calendars

5. 23 July 2026

   Reported

   Committee on Energy and Natural Resources. Reported by Senator Lee with an amendment in the nature of a substitute. Without written report.

   Source: Committee

6. 23 July 2026

   Reported

   Committee on Energy and Natural Resources. Reported by Senator Lee with an amendment in the nature of a substitute. Without written report.

   Source: Committee

Votes

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Versions

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Documents

3 official files

• Reported to Senate

  Reported to Senate · EN · 23 July 2026

  DownloadOpen at official source

• Introduced in Senate

  Introduced in Senate · EN · 29 April 2025

  DownloadOpen at official source

• Introduced in Senate

  summary · EN · 29 April 2025

  Open at official source

Sponsors

• Sen. Durbin, Richard J. [D-IL] · D · Sponsor
• Sen. Duckworth, Tammy [D-IL] · D · Sponsor
• · sseg00 · Standing

Related records

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