How Is This Data Collected?
This data is collected by Flow365 Monitors. These are volunteers who track the status of flow in our creeks and rivers year round. This one-of-a-kind data is helping us restore Tucson’s heritage of flowing creeks and rivers, adapt to climate change, and prepare for a growing population that places higher demands on our regional and local water sources. In both the near and distant future, Flow365 data will help the people of Tucson protect our water, riparian habitats, and the people, plants and animals of the Sonoran Desert.
This data is critical to helping us understand how our desert rivers respond to changes in precipitation and groundwater levels. It also helps us determine the impact of collective conservation actions on creek flows, as we strive towards our long-term goal of restoring Tucson’s heritage of flowing creeks and rivers.
Read the 2025 Annual Water Year Report
The scenic desert flows were scarce this water year. By March 2025, the rainfall data indicated it had been the driest six months on record. During the first 6 months of the 2025 water year, less than an inch of rain (0.91 inches) fell between October 1st, 2024 and March 31st, 2025. The total rainfall for this water year was 4.16 inches (NOAA), most of which fell in July 2025 (1.88 inches). This is less than half of our annual average (10.61 inches). Other than the occasional ponding of rainfall, only the waterways that were supplied by treated wastewater or had consistent groundwater connection saw surface flow (water moving along the earth’s surface) across the Tucson basin.
2025 Water Year ReportPast Flow365 Annual Water Year Reports
Read our past Flow365 Annual Water Year Reports. These reports highlight Flow365 sites across the city with an in-depth review on the water year, understanding how much the area flowed during that time, and what it may mean for our rivers.
Flow365 Community Monitoring Data Dashboard
Our Flow365 Community Scientists collect data from all over our city, with this dashboard you can see what's happening in our creeks and rivers today, last week, or even over the last year!
Learn More About Our Rivers
Read about the history of our rivers, explore past and present river flow with an interactive map, and hear from the community about their memory of flowing rivers.