Hydrohistorian

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Blue River below Green Mountain Reservoir

Reservoir gage · BLUGRECO · USGS 09057500 · Division 5 · Water District 36 · Summit County

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

The record

Period of record
1937-10-01 → 2026-07-06
Daily values
32,421
Latest cached reading
687.0 cfs (2026-07-06)
Trend
decreasing, -3.75 cfs/decade
Pettitt changepoint
~1986

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).

Provenance

DWR station abbreviation BLUGRECO; recorded station name “BLUE RIVER BELOW GREEN MOUNTAIN RESERVOIR, 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.