Hydrohistorian

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Boulder Creek at Mouth near Longmont

River gage · BOCLONCO · USGS 06730500 · Division 1 · Water District 6 · Weld County

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

The record

Period of record
1927-04-01 → 2026-08-12
Daily values
26,961
Latest cached reading
0.3 cfs (2026-08-12)
Trend
increasing, 4.24 cfs/decade (6.5% of median)
Pettitt changepoint
~1954

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 (user supplied).

Provenance

DWR station abbreviation BOCLONCO; recorded station name “BOULDER CREEK AT MOUTH NEAR LONGMONT, 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.