The Birth of a Basin: A Watershed Moment in Arizona's History The Colorado River Compact of 1922 is often seen as a defining moment in Arizona's development, shaping not only the state's water rights but also its economic growth, urban planning, and envir

The Birth of a Basin: A Watershed Moment in Arizona's History

The Colorado River Compact of 1922 is often seen as a defining moment in Arizona's development, shaping not only the state's water rights but also its economic growth, urban planning, and environmental policies. This pivotal agreement allocated water from the Colorado River to seven states, including Arizona, setting the stage for the state's rapid expansion.

As you explore Phoenix, Arizona's capital city, you'll discover a rich history that reflects the complex relationships between humans, water, and land. In this guide, we'll delve into the world of Phoenix water rights, exploring key facts, practical tips, and what to expect from your visit.

A Brief History of Water Rights in Arizona

The Colorado River Compact was negotiated by representatives of seven states – Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming. The agreement established a framework for managing the river's water resources, allocating 7.5 million acre-feet to each state. For Arizona, this meant approximately 2 million acre-feet per year.


To put this in perspective, consider that Phoenix receives only about one-third of its annual rainfall. As a result, the city relies heavily on the Colorado River for its water supply. In fact, more than 90% of Phoenix's drinking water comes from the river.

The Importance of Water Rights Today

Understanding Arizona's complex water rights landscape is crucial for navigating the state's economy, environment, and politics. Today, water scarcity remains a pressing concern in the region, with drought conditions affecting agricultural production, urban development, and ecosystems.

As you explore Phoenix, consider visiting the Arizona State Capitol, where you can learn more about the state's water history and governance. You might also want to stop by the Heritage Square Museum to discover the city's early days and how water played a vital role in its growth.

Exploring Phoenix Water Sources

Phoenix has several water sources, including:

• Salt River Project (SRP): A major provider of drinking water for Phoenix residents.
• Central Arizona Project (CAP): A canal system that brings Colorado River water to the state.
• Municipal water supplies: Several local governments manage their own water systems.

What to Expect from Your Visit

When visiting Phoenix, be prepared for:

• Warm weather: Temperatures often soar above 100°F (38°C) during the summer months.
• Limited precipitation: Rainfall is scarce in Phoenix, with most areas receiving less than 12 inches per year.
• Dry landscapes: Be sure to stay hydrated while exploring Arizona's arid environments.

Practical Info

• Hours and fees: Check with individual attractions for specific hours and fees. Some sites may offer free admission or guided tours.
• Location hints: Visit the official websites of the attractions mentioned above for directions and maps.
• Contact details: Reach out to local organizations, such as the Arizona Water Resources Agency, for more information on water rights and management.