Hydrohistorian

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South Boulder Creek below Gross Reservoir

Reservoir gage · BOCBGRCO · USGS 06729450 · Division 1 · Water District 6 · Boulder County

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

The record

Period of record
1967-10-01 → 2026-08-12
Daily values
21,500
Latest cached reading
69.0 cfs (2026-08-12)
Trend
decreasing, -7.04 cfs/decade (-5.1% of median)
Pettitt changepoint
~1991

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

Loading chart…

Where it sits

Location as DWR records it (user supplied).

Provenance

DWR station abbreviation BOCBGRCO; recorded station name “SOUTH BOULDER CREEK BELOW GROSS RESERVOIR”; 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.