Mammoth Cave National Park Boundary Adjustment Act of 2025
The Mammoth Cave National Park Boundary Adjustment Act of 2025 would, as introduced, modify the boundary of Mammoth Cave National Park by updating the statutory land-acquisition cap to reflect inflation and by authorizing the addition of roughly 551.14 acres to the park. Specifically, it amends the 1942 act establishing the park to (1) index the $350,000 land-purchase cap to current purchasing power using the Consumer Price Index, and (2) authorize the Secretary of the Interior to acquire about 551.14 acres (and any interests in that land) shown as “Proposed Addition” on a May 2025 map for inclusion in the park. The land area is identified as part of the proposed southern boundary expansion in Edmonson and Barren Counties, Kentucky. The bill thus paves the way for formal expansion of Mammoth Cave National Park, subject to usual land-conveyance processes and funding.
Key Points
- 1The bill amends Section 11 of the 1942 Mammoth Cave National Park statute to adjust the inflation-adjusted cost limit for land acquisitions (adding CPI indexing after the current $350,000 figure).
- 2It authorizes the Secretary of the Interior to acquire approximately 551.14 acres of land, and any interests in that land, for inclusion in Mammoth Cave National Park.
- 3The land to be acquired is depicted as “Proposed Addition” on a map titled “Mammoth Cave National Park Proposed Southern Boundary Expansion Edmonson and Barren Counties, Kentucky,” map number 135/177,967, dated May 2025.
- 4The expansion is described as a southern boundary expansion to be incorporated into the park.
- 5The acquiring authority is the United States Department of the Interior (specifically the National Park Service).