# Rio Grande basin streamflow Daily mean discharge across 2 gauges _Data through Aug 26, 2026 · source last checked Aug 27, 2026 · page revised Aug 27, 2026_ > 2 basin-representative gauges tracked. Rio Grande streamflow on Aug 26 read 177 cfs at Otowi Bridge and 0 cfs at San Marcial Floodway. ## The numbers | Gauge | Discharge | As of | | --- | --- | --- | | Rio Grande at Otowi Bridge | 177 cfs | Aug 26, 2026 | | Rio Grande Floodway at San Marcial | 0.0 cfs | Aug 26, 2026 | ## About Rio Grande basin The Rio Grande runs from the San Juan Mountains of Colorado through New Mexico to the Texas border. This page lines up its two accounting gages: Otowi Bridge, above Cochiti, where New Mexico's Rio Grande Compact delivery obligation is measured, and San Marcial, the last station above Elephant Butte Reservoir. The distance between the two lines is the story of the Middle Rio Grande. Between the gages the river crosses a long, sandy, evaporative reach and passes the Middle Rio Grande Conservancy District's diversions, so San Marcial always reads well below Otowi and the gap widens through the irrigation season. In dry years the reach can go intermittent and San Marcial can approach zero while Otowi still shows flow. Both gages peak with May snowmelt and both take monsoon pulses in July and August, but only Otowi's number carries a legal consequence. ## About this data - Source: US Geological Survey (USGS) - Series: Daily mean streamflow (discharge) - Geography: Rio Grande - Unit: cfs - Calculation period: Daily mean - Last observation: Aug 26, 2026 - Update frequency: Daily --- Cite: Rio Grande basin: 177 cfs daily mean discharge as of Aug 26, 2026 (USGS). The Waterline. https://the-waterline.com/streamflow/rio-grande-basin Canonical URL: https://the-waterline.com/streamflow/rio-grande-basin