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US Antiquities Act Monument Actions (1906–2017) - Free Download

All actions taken under the US Antiquities Act from 1906 to 2017, including monument establishments, expansions, and reductions, with acreage and the president who signed each action. Contains 344 records. Download in Excel, CSV, PDF formats.

records 20 รายการ 🏷️ Environment 🕐 อัปเดต 2026-04

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💡 Key Takeaways

  • Contains 344 records / 9 fields
  • Available for free download in Excel, CSV, and PDF formats
  • Data sourced from: https://github.com/fivethirtyeight/data

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Showing 20 of 344

⚠️ Showing first 20 of 344 records. Download the file for complete data.

Current Name States Original Name Current Agency Action Date Year Pres Or Congress Acres Affected
Devils Tower National MonumentWyomingNPSEstablished9/24/061906T. Roosevelt1,193.91
El Morro National MonumentNew MexicoNPSEstablished12/8/061906T. Roosevelt160
El Morro National MonumentNew MexicoNPSEnlarged6/18/171917W. Wilson240
Montezuma Castle National MonumentArizonaNPSEstablished12/8/061906T. Roosevelt161.39
Montezuma Castle National MonumentArizonaNPSEnlarged2/23/371937F. D. Roosevelt360
Montezuma Castle National MonumentArizonaNPSEnlarged11/10/78197895th Congress13
Montezuma Castle National MonumentArizonaNPSDeleted11/10/78197895th Congress5
Petrified Forest National ParkArizonaPetrified Forest National MonumentNPSEstablished12/8/061906T. Roosevelt60,776.02
Petrified Forest National ParkArizonaPetrified Forest National MonumentNPSDiminished7/31/111911W. Taft25,625.60
Petrified Forest National ParkArizonaPetrified Forest National MonumentNPSEnlarged11/14/301930H. Hoover11,010
Petrified Forest National ParkArizonaPetrified Forest National MonumentNPSRedesignated NP3/28/58195885th Congress
Petrified Forest National ParkArizonaPetrified Forest National MonumentNPSEnlarged11/30/311931H. Hoover
Petrified Forest National ParkArizonaPetrified Forest National MonumentNPSEnlarged9/23/321932H. Hoover53,300
Chaco Culture National Historical ParkNew MexicoChaco Canyon National MonumentNPSEstablished3/11/071907T. Roosevelt10,643.13
Chaco Culture National Historical ParkNew MexicoChaco Canyon National MonumentNPSEnlarged1/10/281928C. Coolidge21,509.40
Chaco Culture National Historical ParkNew MexicoChaco Canyon National MonumentNPSRedesignated Chaco Culture NHP12/19/80198096th Congress
Lassen Volcanic National ParkCaliforniaCinder Cone National MonumentNPSEstablished5/6/071907T. Roosevelt5,120
Lassen Volcanic National ParkCaliforniaCinder Cone National MonumentNPSIncorporated into Lassen Volcanic NP8/9/16191664th Congress
Lassen Volcanic National ParkCaliforniaLassen Volcanic National MonumentNPSEstablished5/6/071907T. Roosevelt1,280
Lassen Volcanic National ParkCaliforniaLassen Volcanic National MonumentNPSRedesignated Lassen Volcanic NP8/9/16191664th Congress
Source: https://github.com/fivethirtyeight/data Last updated: 2026-04