Hydrohistorian

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Colorado River below Lake Granby

River gage · COLGBYCO · USGS 09019000 · Division 5 · Water District 51 · Grand County

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

The record

Period of record
1985-12-10 → 2026-07-06
Daily values
9,543
Latest cached reading
96.3 cfs (2026-07-06)
Trend
increasing, 4.01 cfs/decade

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 COLGBYCO; recorded station name “COLORADO RIVER BELOW LAKE GRANBY, 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.