Hydrohistorian
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Tonahutu Creek below Harbison Ditch near Grand Lake
Ditch / canal gage · TONHARCO · USGS 09012420 · Division 5 · Water District 51 · Grand County
Live gage at DWR ↗ · USGS monitoring location ↗ · Download daily record (CSV)
Source DWR administrative record · verify at DWR station ↗ Source Independent agency measurement · verify at USGS ↗ Source Our computation, no independent reference · computed here from the screened record
The record
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
Chart: annual mean flow at Tonahutu Creek below Harbison Ditch near Grand Lake, water years 1969 to 1969. The measured record is insufficient data at cubic feet per second per decade. The underlying yearly values are available as a CSV download linked at the top of this page.
Where it sits
Location as DWR records it (5.0).
Provenance
DWR station abbreviation TONHARCO; recorded station name “TONAHUTU CREEK BLW HARBISON DITCH NR GRAND LAKE,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.