Mancos River
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 (3)
- warning: gap Mancos River Near Mancos: 6 gaps of 60+ days inside the record (6,056 days in all). Longest: Oct 1, 1957 to May 10, 1971 (4,970 days); Oct 1, 1984 to Oct 10, 1985 (375 days); Jul 10, 1973 to May 17, 1974 (312 days).
- warning: gap Mancos River Near Mancos, CO: 1 gap of 60+ days inside the record (32,094 days in all). Longest: Oct 1, 1938 to Aug 13, 2026 (32,094 days).
- warning: gap Mancos River Near Towaoc, CO: 1 gap of 60+ days inside the record (2,740 days in all). Longest: Sep 30, 1943 to Mar 31, 1951 (2,740 days).
Context (6)
Show 6 notes
- ended Discontinued gauges: 4 gauges have stopped reporting: Mancos River Near Cortez, CO (last 1979); Mancos River Below Johnson Canyon Nr Cortez, CO (last 1982); Mancos River At Anitas Flat Below Mancos, CO (last 2015); Mancos River Nr Four Corners, CO (last 2026). Their segments rest on fewer gauges after those years.
- flatline Mancos River Near Mancos: 12 runs of 30+ days at exactly the same flow: 3.0 cfs for 154 days from Oct 27, 1975; 2.0 cfs for 92 days from Nov 1, 1956; 1.5 cfs for 31 days from Dec 1, 1954. Usually an estimated period (ice, a broken gauge) rather than measured daily flow.
- flatline Mancos River Near Mancos, CO: 10 runs of 30+ days at exactly the same flow: 3.0 cfs for 75 days from Nov 18, 1935; 2.0 cfs for 72 days from Nov 21, 1934; 2.0 cfs for 62 days from Dec 1, 1933. Usually an estimated period (ice, a broken gauge) rather than measured daily flow.
- flatline Mancos River Near Towaoc, CO: 38 runs of 30+ days at exactly the same flow: 1.0 cfs for 71 days from Oct 22, 1934; 11.0 cfs for 62 days from Dec 1, 1921; 12.0 cfs for 62 days from Dec 1, 1930. Usually an estimated period (ice, a broken gauge) rather than measured daily flow.
- zero run Mancos River Near Towaoc, CO: 14 runs of 60+ days at zero flow; longest 343 days from Aug 3, 2020; 109 days from Jul 12, 1922. Usually real (a dry channel or no release), not missing data.
- zero run Mancos River Nr Four Corners, CO: 1 run of 60+ days at zero flow; longest 68 days from Jun 16, 2025. Usually real (a dry channel or no release), not missing data.
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 |
|---|---|---|---|---|---|
| Mancos River Near Mancos, CO | Mancos | codwr, nwps, usgs | 1931-09-28 | 2026-10-26 | 377 |
| Mancos River Near Mancos | Mancos | codwr | 1953-11-16 | 2026-10-26 | 2922 |
| Mancos River At Cj'S Bridge Near Mancos | Mancos | codwr | 2016-06-27 | 2026-10-26 | 538 |
| Mancos River Near Cortez, CO | Mancos | codwr, usgs | 1976-06-28 | 1979-06-18 | 156 |
| Mancos River Below Johnson Canyon Nr Cortez, CO | Mancos | codwr, usgs | 1979-06-25 | 1982-09-27 | 171 |
| Mancos River At Anitas Flat Below Mancos, CO | Mancos | codwr, usgs | 2003-09-29 | 2015-11-09 | 633 |
| Mancos River Near Towaoc, CO | Mancos | codwr, usgs | 1921-04-04 | 2026-10-26 | 5114 |
| Mancos River Nr Four Corners, CO | Mancos | usgs | 2023-09-11 | 2026-01-26 | 125 |