The Gila and Salt River Principal Meridian, a historical landmark situated in Avondale, Arizona, plays a crucial role in the history of surveying practices within the state. This significant marker is located at the intersection of the Gila Rivers south side, opposite the mouth of the Salt River, with coordinates of 33° 22′ 37.82733″ north and 112° 18′ 21.99931″ west from Greenwich, based on NAD 83. Its position on Monument Hill, a prominent hill just south of the confluence of the Gila and Salt Rivers, makes it an easily visible and accessible point for visitors and surveyors alike.

This principal meridian governs all land surveys in Arizona, setting a standard for accuracy and consistency throughout the states vast landscapes. Its importance cannot be overstated, as it serves as a central reference point for the organization and management of public lands within the region. Moreover, the area surrounding the monument is rich with attractions that cater to diverse interests, such as Enchanted Island Amusement Park, Desert Botanical Garden, Wrigley Mansion, and Phoenix Zoo.

The Base & Meridian (B&M) Wildlife Area, a 200-acre preserve managed by the Arizona Game and Fish Department, is also situated near this historical landmark. The B&M Wildlife Area provides a habitat for various species of birds, mammals, and reptiles that thrive in the unique desert environment. Access to Monument Hill can be granted with permission from the nearby Phoenix International Raceway.

Visitors who venture to this remarkable location will also discover a 0.6-mile out-and-back trail in Avondale, which is considered moderately challenging. While navigating this trail, hikers can appreciate the diverse flora and fauna that call the Sonoran Desert home. As they make their way to Monument Hill, they will encounter numerous opportunities to capture stunning views of the surrounding landscape, including the confluence of the Salt and Gila Rivers.

In conclusion, the Gila and Salt River Principal Meridian is a vital historical landmark that holds significant importance for surveying practices in Arizona. Its location on Monument Hill offers an engaging and informative destination for tourists and locals alike to explore and appreciate the regions rich history and natural beauty. The surrounding attractions, such as the B&M Wildlife Area and nearby trails, provide ample opportunities for visitors to immerse themselves in the unique desert environment that characterizes this part of Avondale, Arizona.