AFOSA is a Tax-Exempt Nonprofit Charity
Residents of the Agua Fria River basin conceived and organized the Agua Fria Open Space Alliance (AFOSA) to protect natural open space. The organization’s founders named AFOSA after the Agua Fria River that flows south above and below ground from Glassford Hill east of Prescott, Arizona to the Gila River west of Phoenix. AFOSA is principally concerned with the 1500 square-mile upper part of the river’s watershed. There, despite small dams and reservoirs on its tributaries, the river rages wildly after summer thunderstorms, and many stretches of beautiful semi-natural riparian vegetation cover its banks. The header photo for this page covers most of the basin.

AFOSA Founding Directors
The Agua Fria River Basin is a great place to see wild animals in natural habitats. Developers are eyeing the Basin, and have ‘mega’ plans to fill it with streets and houses. Construction, air and water pollution, and invasive species are already eliminating and poisoning open space and killing off native plants and animals. Over it all looms the threat of disastrous global warming. Even without climate change, the Arizona Game and Fish Department forecasts a great decline in nature that will make the Agua Fria River Basin a dismal place to live for our grandchildren and their descendants. For now, however, we can step out our doors and behold native vegetation, birds, and insects.
AFOSA Open Space Goals

Some of AFOSA’s Founders and Members
AFOSA focuses on understanding the physical and biological components of open space, providing public education, and encouraging effective management. The organization encourages and supports individuals and organizations working to benefit plants animals and ecosystems.
The Nature Conservation Blog
Request a copy of AFOSA’s history (.pdf file) if you wish to learn more:
Nonprofit Status of Agua Fria Open Space Alliance, Inc.(AFOSA)
The Agua Fria Open Space Alliance, Inc. (AFOSA) is a tax-exempt non-profit corporation under section 501 (c) (3) of the U. S. Internal Revenue Code. Our exemption EIN is: 26-0378948.
Principal Supporters:
We are grateful for support in kind from Microsoft, Inc., Adobe, Inc., Google, Inc., the U. S. Bureau of Land Management, the Town of Dewey-Humboldt, Arizona, and Academic Distributing, Inc. AFOSA would not exist without the many generous contributions of funds, time, equipment, and space made by the friends of open space in the Agua Fria River Basin and elsewhere in the U. S.
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