| Casa Grande Ruins National Monument | |
|---|---|
 The southern facade of the "Big House" | |
   | |
| Location | Pinal County, Arizona, USA |
| Nearest city | Coolidge |
| Coordinates | 32°59′49″N 111°31′55″W / 32.9970051°N 111.5320692°W[1] |
| Area | 472.5 acres (191.2 ha)[2] |
| Created | August 3, 1918 |
| Visitors | 62,995 (in 2018)[3] |
| Governing body | National Park Service |
| Website | Casa Grande Ruins National Monument |
| NRHP reference No. | 66000192[4] |
| Added to NRHP | October 15, 1966 |
Casa Grande Ruins National Monument (O'odham: Siwañ Waʼa Ki: or Sivan Vahki[5]), in Coolidge, Arizona, located northeast of Casa Grande, Arizona, preserves a group of Hohokam structures dating to the Classic Period (1150–1450 CE).
- ^ "Casa Grande Ruins National Monument". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved March 28, 2014.
- ^ "Listing of acreage – December 31, 2013" (XLSX). Land Resource Division, National Park Service. Retrieved December 27, 2012. (National Park Service Acreage Reports)
- ^ "NPS Annual Recreation Visits Report". National Park Service. Retrieved April 1, 2019.
- ^ "National Register Information System". National Register of Historic Places. National Park Service. July 9, 2010.
- ^ "History of the Gila River Water Settlement Act of 2004, Chapter 1: Roots" (PDF).