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Rio Grande at Alamosa

River gage · RIOALACO · USGS 08223000 · Division 3 · Water District 20 · Alamosa County

Live gage at DWR ↗ · USGS monitoring location ↗ · Download daily record (CSV)

The record

Period of record
1912-06-01 → 2026-07-06
Daily values
41,674
Latest cached reading
9.6 cfs (2026-07-06)
Trend
no trend, -4.73 cfs/decade (-2.7% of median)
Pettitt changepoint
~1929

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.

Annual flow & trend

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Where it sits

Location as DWR records it (5.0).

Provenance

DWR station abbreviation RIOALACO; recorded station name “RIO GRANDE AT ALAMOSA”; operated by DWR. 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.