South Fork Rio Grande
Streamflow, conditions and background by watershed segment. Data through November 1, 2026.
Data gaps and disparities
Found automatically in the gauge records behind this river, and notes from a reviewer who checked them against other sources. Gauges need at least 26 weeks of daily data to appear on the Flow tab.
Warnings (1)
- warning: gap South Fork Rio Grande At South Fork: 1 gap of 60+ days inside the record (4,961 days in all). Longest: Oct 1, 1922 to Apr 30, 1936 (4,961 days).
Context (6)
Show 6 notes
- ended Discontinued gauges: 1 gauge has stopped reporting: South Fork Rio Grande Below Columbine Creek Near South Fork (last 2016). Their segments rest on fewer gauges after those years.
- single gauge Rio Grande Headwaters: 99% of this segment's weeks rest on a single gauge; the segment value is that gauge in those weeks, and jumps when other gauges join or drop out.
- copy disagree South Fork Rio Grande At South Fork: The usace_cwms copy agrees on the median but differs by more than 10% on 33% of 6,597 shared days (often provisional vs approved data, or a different daily averaging window). The report takes 124 days from usace_cwms where usbr_hydrodata is missing, so the level can shift there.
- flatline South Fork Rio Grande At South Fork: 47 runs of 30+ days at exactly the same flow: 28.0 cfs for 60 days from Jan 1, 1956; 42.0 cfs for 38 days from Feb 1, 1939; 40.0 cfs for 32 days from Nov 30, 1959. Usually an estimated period (ice, a broken gauge) rather than measured daily flow.
- zero run South Fork Rio Grande At South Fork: 1 run of 60+ days at zero flow; longest 83 days from Dec 19, 2024. Usually real (a dry channel or no release), not missing data.
- gap South Fork Rio Grande Below Columbine Creek Near South Fork: 1 gap of 60+ days inside the record (161 days in all). Longest: Oct 26, 2015 to Apr 3, 2016 (161 days).
Values removed (0)
A reading is removed automatically only when it is impossible (for example, a daily mean above the highest flow USGS recorded that water year). Low and zero flows are never removed: rivers here really do dry up.
None.
Gauges
Each row is one physical gauge; "published by" lists every agency copy that was merged into it.
| Gauge | Segment | Published by | First | Last | Weeks |
|---|---|---|---|---|---|
| South Fork Rio Grande At South Fork | Rio Grande Headwaters | codwr, usace_cwms, usbr_hydrodata | 1910-08-01 | 2026-10-26 | 5357 |
| South Fork Rio Grande Below Columbine Creek Near South Fork | Rio Grande Headwaters | codwr | 2015-03-30 | 2016-10-10 | 58 |