Santa Cruz River Research Days - an annual event allowing partners to share their work.
Click on a year to learn more on that year's event.
Learning Center of the American Southwest
Reports / Publications
See below for recent reports. To view a complete list Click Here
A Living River: Charting the Health of the Upper Santa Cruz River
Read more about this report series.
2010 Water Year - year three of annual report shows continued improvement on the Upper Santa Cruz River
Santa Cruz County Water Harvesting Guidance Manual
"State of" Reports Bibliography
2012 Annotated Bibliographyof reports summarizing the "State of....".
Riparian Health Score Card Bibliography
2012 List of Example Scorecards, with summaries and analyses.
Join our select group of Hummingbird Circle members who have stepped up their giving to support the vital work of the Sonoran Institute.
More About the Santa Cruz River Watershed
The Santa Cruz River watershed is the land that water runs over, under, or through, on its way to the Santa Cruz River. The river begins in Arizona, flows south into Sonora, Mexico, makes a u-turn, and flows north back into Arizona and through Santa Cruz County, Pima County and the City of Tucson. The Santa Cruz River is the only river to cross the U.S./Mexico border twice (see map below, or Download a PDF copy).
The Santa Cruz River and major tributaries sustain one of the country’s largest cottonwood-willow riparian forests and provide habitat to numerous species, including the endangered Southwestern Willow Flycatcher and Gila Topminnow.
The Santa Cruz River:
* feeds agricultural and ecological processes that contribute to local economies;
* increases municipal water supplies;
* sustains invaluable riparian ecosystems in rural and urban areas;
* provides many imporant ecosystem services or benefits to local communities; and
* is central to the culture of the region.
As the primary water resource in Santa Cruz County, the Upper Santa Cruz River (USCR) provides water to communities, farmers, and ranchers. The USCR aquifer (groundwater storage system) is generally shallow with limited capacity and extreme sensitivity to drought.
Along the USCR, people and river ecosystems depend upon the same sources of water - notably surface flow in the river and shallow groundwater. Climate predictions forecast longer and more intense droughts for the region which could diminish supplies of water. Meanwhile, growing populations increase demand for clean water. The EPA has a taskforce that focuses on water quality challenges in the U.S./Mexico border region. One of these challenges centers on the Nogales International Wastewater Treatment Plant, which discharges 15 million gallons of treated effluent (wastewater that has been cleaned to an accepted level) a day into the river in Santa Cruz County. While this discharge creates water quality concerns, the effluent also nourishes the riparian vegetation and recharges the aquifer.
Many local planning and research efforts have focused on assessing the values, threats, and needs of the USCR and associated riparian habitat.
- In 2004, Santa Cruz County approved a comprehensive land-use plan that identified the USCR as an important regional resource and specifically stated on page 11 that “the Santa Cruz River and its watershed should be conserved and managed as a ‘Living Ecosystem.’ ” Download the plan (pdf).
- The National Park Service has completed several ecological inventories along the river and is implementing a long-term inventory and monitoring program. Read the inventory reports.
- In addition to agencies, individual landowners and local organizations have initiated and completed restoration and monitoring programs on private land.
- An effort is underway to designate the Santa Cruz River Valley as a National Heritage Area.
Read more at the Santa Cruz Valley Heritage Alliance.
- Friends of the Santa Cruz River has monitored surface water quality monthly for over a decade, supplying data to the Arizona Department of Environmental Quality.
Read more at Friends of the Santa Cruz River.
- In 2006, Santa Cruz County’s Community Development Department, the University of Arizona’s Office of Arid Lands Studies, and the Sonoran Institute mapped the riparian vegetation along the Upper Santa Cruz River. Read About Santa Cruz Riparian Vegetation Map