Total streamflow across the Santa Cruz River was last observed at 115 cfs, and is expected to yield approximately 228 acre-ft of water today; about 113% of normal. Average streamflow for this time of year is 102 cfs, with recent peaks last observed on 2021-07-26 when daily discharge volume was observed at 20,367 cfs.

Maximum discharge along the river is currently at the Santa Cruz River At Cortaro reporting a streamflow rate of 65.6 cfs. However, the streamgauge with the highest stage along the river is the Santa Cruz River At Tubac with a gauge stage of 19.4 ft. This river is monitored from 9 different streamgauging stations along the Santa Cruz River, the highest being situated at an altitude of 6,489 ft, the Santa Cruz River Near Cundiyo.

The Santa Cruz River is a 184-mile-long river that flows through the southern part of Arizona and northern part of Mexico. The river has a rich history, with evidence of human activity along its banks dating back over 4,000 years. The hydrology of the river has been significantly impacted by human activity, including diversion of water for agricultural use and the construction of dams and reservoirs. The two main reservoirs on the river are Lake Patagonia and the Rio Rico Reservoir. The river is also an important source of water for irrigation, supporting agriculture in the region. In recent years, efforts have been made to restore the river and its ecosystem, including the removal of invasive plant species and the reintroduction of native fish species. The river also provides recreational opportunities, including fishing and boating.