Interior Department to study ancient Illinois mounds for national park status
S. 1516 — Cahokia Mounds Mississippian Culture Study Act · Filed by Richard Durbin (D-IL) · 1 cosponsor · Introduced Apr 29, 2025 · Reported out
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What it does
This bill directs the Secretary of the Interior to study three ancient Native American mound sites in Illinois (Cahokia Mounds, Emerald Mounds, and Pulcher Mounds) to determine whether they should become a unit of the National Park System. The study will evaluate their national significance, explore preservation alternatives, consult with Indian tribes and local stakeholders, and estimate costs—with a report due within 3 years.
Why we flagged it
The bill is a straightforward authorization for a feasibility and significance study of three Native American archaeological sites, with no hidden mechanisms or private beneficiaries. It follows standard National Park Service study procedures.
What the text implies
- A positive study outcome could lead to future legislation designating the sites as a National Park or National Monument, triggering federal land acquisition and long-term operational costs.
- The study's consultation requirement with Indian tribes may establish precedent for tribal co-management or decision-making authority over federal cultural resource designations.
- Designation as a National Park unit could affect local property values, land use, and economic development patterns in St. Clair and Monroe Counties, Illinois.
Section numbers refer to the bill text the analysis read — linked under Primary records below.
Who it affects
The bill authorizes a study of culturally and archaeologically significant Native American sites, creating a pathway for potential federal protection and public access to these resources. It mandates consultation with Indian tribes, centering indigenous voices in decisions about their own cultural heritage.
Named in the bill
Secretary of the Interior, Cahokia Mounds State Historic Site, Emerald Mounds, Pulcher Mounds, St. Clair County, Illinois, Monroe County, Illinois, National Park System, Indian Tribes (federally recognized), Senate Committee on Energy and Natural Resources, House Committee on Natural Resources
Where it stands
1 cosponsor: 1 Democrats.
- Apr 29, 2025 — Introduced · Congress.gov: “Introduced in Senate”
- Apr 29, 2025 — Referred to Senate Committee on Energy and Natural Resources · Congress.gov: “Read twice and referred to the Committee on Energy and Natural Resources. (text: CR S2668)”
- Feb 4, 2026 — Reported out of committee · Congress.gov: “Committee on Energy and Natural Resources. Ordered to be reported with an amendment in the nature of a…”
Dates and quoted wording are Congress.gov's action record; the timeline shows status changes, not every procedural step.
How this was measured
Analysis — Quorum's AI read the bill text published by Congress.gov (2,040 characters) on Aug 21, 2026. Section numbers in the findings refer to that text, linked below; transparency and hidden-provision scores are compared against the median of 16,222 analysed bills.
Status and sponsors — Congress.gov's bill record — actions, committee referrals and cosponsors — loaded nightly. The timeline shows status changes, not every procedural action.
As of — page rendered 2026-10-20.
“Interior Department to study ancient Illinois mounds for national park status” QuorumCivic. https://share.quorumcivic.app/bill/119/s1516 Report an error
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