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Cahokia Mounds Mississippian Culture Study Act

S. 1516 · 119th Congress (2025-2026)

S. 1516119TH CONGRESSINTRODUCED 04/29/2025SEN. DURBIND-IL · SPONSORLeft: no (Sponsor Ranking)Lean left: DW-NOMINATE -0.34 (Sponsor Ranking)Center: no (Sponsor Ranking)Lean right: no (Sponsor Ranking)Right: no (Sponsor Ranking)LEAN LEFT(SPONSOR RANKING)PUBLIC LANDS AND NATURAL RESOURCES

2 members · Left 2 · Center 0 · Right 0 (Bill Ranking)

SponsorSen. Durbin, Richard J. (D-IL) (Introduced 04/29/2025)
Sponsor Voting RecordLean left · DW-NOMINATE -0.34 · measured from every roll-call vote this member has cast (voteview.com) (Sponsor Ranking)
Support
LLLCLRR

support across the spectrum: 2 members signed on (Bill Ranking) this bill: sponsor + current cosponsors, each once

CommitteesSenate - Energy and Natural Resources Committee; Senate - Energy and Natural Resources Committee; Senate - Energy and Natural Resources Committee
Latest Action07/23/2026 Placed on Senate Legislative Calendar under General Orders. Calendar No. 478.
Roll Call VotesThere have been no roll call votes
Sourceview on congress.gov →
IntroducedPassed HousePassed SenateResolving DifferencesTo PresidentBecame Law

Summary (1)

Introduced in Senate (04/29/2025)

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.

Text (2)

Introduced in Senate (IS)

119 S1516 IS: Cahokia Mounds Mississippian Culture Study Act U.S. Senate 2025-04-29 text/xml EN Pursuant to Title 17 Section 105 of the United States Code, this file is not subject to copyright protection and is in the public domain. II119th CONGRESS1st SessionS. 1516IN THE SENATE OF THE UNITED STATESApril 29, 2025Mr. Durbin (for himself and Ms. Duckworth) introduced the following bill; which was read twice and referred to the Committee on Energy and Natural ResourcesA BILLTo 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.Short titleThis Act may be cited as the Cahokia Mounds Mississippian Culture Study Act.2.FindingsCongress finds that—(1)the city of Cahokia—(A)was inhabited from approximately A.D. 700 to 1400; and(B)at its peak from A.D. 1050 to 1200—(i)covered nearly 6 square miles; and(ii)was home to 10,000 to 20,000 people;(2)more than 120 mounds were built over time at the site of the city of Cahokia;(3)the site of the city of Cahokia is named for the Cahokia subtribe of the Illinois Confederation, who moved into the area in the 1600s;(4)the city of Cahokia was the central hub and largest city of the Mississippian culture that ruled and traded across half of North America, more than 1,250,000 square miles;(5)the city of Cahokia—(A)was the first known organized urbanization and government north of Mexico; and(B)at its peak, was larger than most European cities, including London;(6)some of the Cahokia Mounds, which were built from A.D. 900 to 1400, still stand as earthen monuments and remnants of Mississippian culture, which is the greatest prehistoric ancient culture in North America, the people of which are ancestors to many of today’s First People and Nations; and(7)the Cahokia Mounds are designated as—(A)a National Historic Landmark;(B)an Illinois State Historic Site; and(C)a United Nations Educational, Scientific, and Cultural Organization World Heritage Site.3.DefinitionsIn this Act:(1)SecretaryThe term Secretary means the Secretary of the Interior.(2)Study areaThe term Study Area means—(A)the Cahokia Mounds State Historic Site; (B)the Emerald Mounds in St. Clair County, Illinois; and(C)the Pulcher Mounds in Monroe and St. Clair Counties, Illinois.4.Special resource study(a)StudyThe Secretary shall conduct a special resource study of the Study Area.(b)ContentsIn conducting the study under subsection (a), the Secretary shall—(1)evaluate the national significance of the Study Area;(2)determine the suitability and feasibility of designating the Study Area as a unit of the National Park System;(3)consider other alternatives for preservation, protection, and interpretation of the Study Area by—(A)Federal, State, or local governmental entities; or(B)private and nonprofit organizations;(4)consult with—(A)interested entities of the Federal Government or State or local governmental entities;(B)private and nonprofit organizations; or(C)any other interested individuals; and(5)identify cost estimates for any Federal acquisition, development, interpretation, operation, and maintenance associated with the alternatives considered under paragraph (3).(c)Applicable lawThe study required under subsection (a) shall be conducted in accordance with section 100507 of title 54, United States Code.(d)ReportNot later than 3 years after the date on which funds are first made available to conduct the study required under subsection (a), the Secretary shall submit to the Committee on Energy and Natural Resources of the Senate and the Committee on Natural Resources of the House of Representatives a report containing—(1)the results of the study; and(2)any conclusions and recommendations of the Secretary.

Reported in Senate (RS)

119 S1516 RS: Cahokia Mounds Mississippian Culture Study Act U.S. Senate 2026-07-23 text/xml EN Pursuant to Title 17 Section 105 of the United States Code, this file is not subject to copyright protection and is in the public domain. IICalendar No. 478119th CONGRESS2d SessionS. 1516IN THE SENATE OF THE UNITED STATESApril 29, 2025Mr. Durbin (for himself and Ms. Duckworth) introduced the following bill; which was read twice and referred to the Committee on Energy and Natural ResourcesJuly 23, 2026Reported by Mr. Lee, with an amendmentStrike out all after the enacting clause and insert the part printed in italicA BILLTo 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.Short titleThis Act may be cited as the Cahokia Mounds Mississippian Culture Study Act.2.FindingsCongress finds that—(1)the city of Cahokia—(A)was inhabited from approximately A.D. 700 to 1400; and(B)at its peak from A.D. 1050 to 1200—(i)covered nearly 6 square miles; and(ii)was home to 10,000 to 20,000 people;(2)more than 120 mounds were built over time at the site of the city of Cahokia;(3)the site of the city of Cahokia is named for the Cahokia subtribe of the Illinois Confederation, who moved into the area in the 1600s;(4)the city of Cahokia was the central hub and largest city of the Mississippian culture that ruled and traded across half of North America, more than 1,250,000 square miles;(5)the city of Cahokia—(A)was the first known organized urbanization and government north of Mexico; and(B)at its peak, was larger than most European cities, including London;(6)some of the Cahokia Mounds, which were built from A.D. 900 to 1400, still stand as earthen monuments and remnants of Mississippian culture, which is the greatest prehistoric ancient culture in North America, the people of which are ancestors to many of today’s First People and Nations; and(7)the Cahokia Mounds are designated as—(A)a National Historic Landmark;(B)an Illinois State Historic Site; and(C)a United Nations Educational, Scientific, and Cultural Organization World Heritage Site.3.DefinitionsIn this Act:(1)SecretaryThe term Secretary means the Secretary of the Interior.(2)Study areaThe term Study Area means—(A)the Cahokia Mounds State Historic Site; (B)the Emerald Mounds in St. Clair County, Illinois; and(C)the Pulcher Mounds in Monroe and St. Clair Counties, Illinois.4.Special resource study(a)StudyThe Secretary shall conduct a special resource study of the Study Area.(b)ContentsIn conducting the study under subsection (a), the Secretary shall—(1)evaluate the national significance of the Study Area;(2)determine the suitability and feasibility of designating the Study Area as a unit of the National Park System;(3)consider other alternatives for preservation, protection, and interpretation of the Study Area by—(A)Federal, State, or local governmental entities; or(B)private and nonprofit organizations;(4)consult with—(A)interested entities of the Federal Government or State or local governmental entities;(B)private and nonprofit organizations; or(C)any other interested individuals; and(5)identify cost estimates for any Federal acquisition, development, interpretation, operation, and maintenance associated with the alternatives considered under paragraph (3).(c)Applicable lawThe study required under subsection (a) shall be conducted in accordance with section 100507 of title 54, United States Code.(d)ReportNot later than 3 years after the date on which funds are first made available to conduct the study required under subsection (a), the Secretary shall submit to the Committee on Energy and Natural Resources of the Senate and the Committee on Natural Resources of the House of Representatives a report containing—(1)the results of the study; and(2)any conclusions and recommendations of the Secretary.

1.Short titleThis Act may be cited as the Cahokia Mounds Mississippian Culture Study Act.2.DefinitionsIn this Act:(1)Indian TribeThe term Indian Tribe has the meaning given the term Indian tribe in section 102 of the Federally Recognized Indian Tribe List Act of 1994 (25 U.S.C. 5130).(2)SecretaryThe term Secretary means the Secretary of the Interior.(3)Study areaThe term Study Area means—(A)the Cahokia Mounds State Historic Site; (B)the Emerald Mounds in St. Clair County, Illinois; and(C)the Pulcher Mounds in Monroe and St. Clair Counties, Illinois.3.Special resource study(a)StudyThe Secretary shall conduct a special resource study of the Study Area.(b)ContentsIn conducting the study under subsection (a), the Secretary shall—(1)evaluate the national significance of the Study Area;(2)determine the suitability and feasibility of designating the Study Area as a unit of the National Park System;(3)consider other alternatives for preservation, protection, and interpretation of the Study Area by—(A)Federal, State, or local governmental entities; or(B)private and nonprofit organizations;(4)consult with—(A)interested entities of the Federal Government or State or local governmental entities;(B)applicable Indian Tribes;(C)private and nonprofit organizations; or(D)any other interested individuals; and(5)identify cost estimates for any Federal acquisition, development, interpretation, operation, and maintenance associated with the alternatives considered under paragraph (3).(c)Applicable lawThe study required under subsection (a) shall be conducted in accordance with section 100507 of title 54, United States Code.(d)ReportNot later than 3 years after the date on which funds are first made available to conduct the study required under subsection (a), the Secretary shall submit to the Committee on Energy and Natural Resources of the Senate and the Committee on Natural Resources of the House of Representatives a report containing—(1)the results of the study; and(2)any conclusions and recommendations of the Secretary. July 23, 2026Reported with an amendment

The bill's own words, from our database (synced from the GPO BILLS XML); paragraph breaks added at the bill's section boundaries, nothing else changed.

All Actions (6)

DateChamberAll Actions
04/29/2025Library of CongressIntroduced in Senate
04/29/2025SenateRead twice and referred to the Committee on Energy and Natural Resources. (text: CR S2668)
02/04/2026SenateCommittee on Energy and Natural Resources. Ordered to be reported with an amendment in the nature of a substitute favorably.
07/23/2026Library of CongressCommittee on Energy and Natural Resources. Reported by Senator Lee with an amendment in the nature of a substitute. Without written report.
07/23/2026SenateCommittee on Energy and Natural Resources. Reported by Senator Lee with an amendment in the nature of a substitute. Without written report.
07/23/2026SenatePlaced on Senate Legislative Calendar under General Orders. Calendar No. 478.

Titles (4)

Title TypeTitle
Display TitleCahokia Mounds Mississippian Culture Study Act
Short Title(s) as Reported to SenateCahokia Mounds Mississippian Culture Study Act
Short Title(s) as IntroducedCahokia Mounds Mississippian Culture Study Act
Official Title as IntroducedA 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.

Amendments (0)

There are no amendments to this bill.

Cosponsors (1)

* = Original cosponsor

Committees (3)

CommitteeActivity
Senate - Energy and Natural Resources Committee07/23/2026 Reported By
Senate - Energy and Natural Resources Committee02/04/2026 Markup By
Senate - Energy and Natural Resources Committee04/29/2025 Referred To

Related Bills (0)

No related bill information was received for S. 1516.

Subjects (3)

Policy Area: Public Lands and Natural Resources

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