# San Joaquin River near Vernalis streamflow Daily mean discharge, San Joaquin basin, California _Data through Jul 25, 2026 · source last checked Jul 26, 2026 · page revised Jul 26, 2026_ > Now 521 cfs, 34% below the 5-yr median. San Joaquin River near Vernalis ran at 521 cfs, 34% below the 5-year median. Flow dropped 67.6% from a month ago. Year over year, flow was 25.2% higher. ## The numbers | Period | Current | Prior | Change | | --- | --- | --- | --- | | Week over week | 521 cfs | 529 cfs | -1.5% | | Month over month | 521 cfs | 1,610 cfs | -67.6% | | Year over year | 521 cfs | 416 cfs | +25.2% | | vs 5-yr median | 521 cfs | 785 cfs | -33.6% | ## About this data - Source: US Geological Survey (USGS) - Series: Daily mean streamflow (discharge) - Geography: San Joaquin River near Vernalis - Unit: cfs - Calculation period: Daily mean - Last observation: Jul 25, 2026 - Update frequency: Daily --- Cite: San Joaquin River near Vernalis: 521 cfs daily mean discharge as of Jul 25, 2026 (USGS). The Waterline. https://the-waterline.com/streamflow/san-joaquin-river-near-vernalis Canonical URL: https://the-waterline.com/streamflow/san-joaquin-river-near-vernalis