Hydrohistorian
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Yampa River near Maybell
River gage · YAMAYBCO · USGS 09251000 · Division 6 · Water District 44 · Moffat County
Live gage at DWR ↗ · USGS monitoring location ↗ · Download daily record (CSV)
Source DWR administrative record · verify at DWR station ↗ Source Independent agency measurement · verify at USGS ↗ Source Our computation, no independent reference · computed here from the screened record
Two different numbers, deliberately: Flowing now is raw 15-minute telemetry, provisional and unreviewed. Latest cached reading is the end of the verified daily record. They are never merged, and the verified series is the one the trend is computed on.
The record
Readings come from the weekly-refreshed cache, never fetched live — the date beside the value says exactly how fresh it is. The live gage is one click up.
The water itself
USGS keeps a sensor here. Latest readings, with the last 30 days of daily means beside each. Provisional: not yet reviewed by USGS, and revised when it is.
Fetched 2026-10-13 09:21 UTC from USGS NWIS (site 09251000). The USGS page has the full sensor record; every Colorado sensor site is listed on one page.
Annual flow & trend
Chart: annual mean flow at Yampa River near Maybell, water years 1916 to 2026. The measured record is no trend at -23.73 cubic feet per second per decade. The underlying yearly values are available as a CSV download linked at the top of this page.
Where it sits
Location as DWR records it (5.0).
Seasonal runoff outlook
NRCS calls it even odds that this gage carries at least 73 thousand acre-feetA volume: one acre covered a foot deep, about 326,000 gallons -- roughly a suburban household's outdoor use for a year. over 06-01 to 07-31 — 21% of a normal season; almost certainly at least 32, probably not more than 140. Issued 2026-06-01 — the season’s final; new forecasts begin in January.
| 90% chance of at least | 70% chance of at least | 50% chance of at least | 30% chance of at least | 10% chance of at least | Normal |
|---|---|---|---|---|---|
| 32 kAF | 52 kAF | 73 kAF | 105 kAF | 140 kAF | 340 kAF |
The row is one season as a range of odds (exceedanceA forecast stated as odds of AT LEAST this much: the 90% exceedance value is a near-floor the river beats nine years in ten, the 10% value a near-ceiling it reaches one year in ten, and 50% is even odds -- as likely to come in above as below. values): the left end is a near-floor the river beats nine years in ten, the right a near-ceiling. How to read these numbers → Forecast by the NRCS National Water and Climate Center; shown beside the gage’s own record, which is what it is verified against on the report card.
Provenance
DWR station abbreviation YAMAYBCO; recorded station name “YAMPA RIVER NEAR MAYBELL, CO”; operated by USGS. Daily flows from the DWR HydroBase snapshot plus CDSS REST updates, refreshed on the weekly cycle. Trend statistics are Mann-Kendall (Hamed-Rao corrected) with Sen's slope in native cfs, the same numbers as the basin Trends tab.