Hydrohistorian
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Don La Font Ditch No. 1 at Piedra Pass
Transbasin diversion gage · DLFDT1CO · Division 3 · Water District 20 · Mineral County
Live gage at DWR ↗ · Download daily record (CSV)
Source DWR administrative record · verify at DWR station ↗ Source Our computation, no independent reference · computed here from the screened record
Two different numbers, deliberately: Flowing now is raw 15-minute telemetry, provisional and unreviewed. Latest cached reading is the end of the verified daily record. They are never merged, and the verified series is the one the trend is computed on.
What this gage meters
This is not a natural stream record. The Don La Font Ditches moves water from Piedra River headwaters at Piedra Pass (Div 7) into Rio Grande headwaters (Div 3) — so this record is a ledger of those deliveries. Trends here reflect operational and demand decisions, not the basin's hydrology, and the basin trends page marks it accordingly (⇆). All of Colorado's curated transbasin diversions are collected at /transbasin.
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 Don La Font Ditch No. 1 at Piedra Pass, water years 1951 to 2026. The measured record is no trend at -0.0 cubic feet per second per decade. A Pettitt changepoint is detected around 1992. The underlying yearly values are available as a CSV download linked at the top of this page.
This gage measures the Don La Font Ditches, water carried across the Continental Divide. It is taken from Piedra River headwaters at Piedra Pass (Div 7) and delivered to Rio Grande headwaters (Div 3) — so what this gage reads leaves one river basin for good and arrives in another.
The two ends: Don La Font Ditch No 1 (source, on East Fork Piedra River); Don La Font Ditch No 2 (source, on East Fork Piedra River); Don La Font No 1 D (receiving, on Transbasin Water); Don La Font No 2 D (receiving, on Transbasin Water)
- Decree in case CA0308-D ↗ · imaged 2008-04-01 · filed under the source end, Don La Font Ditch No 1
- Decree in case CA0308-D ↗ · imaged 2008-04-01 · filed under the source end, Don La Font Ditch No 2
The ditch’s mapped channel is drawn on the map below where the USGS has surveyed it. Every crossing →
Where it sits
Location as DWR records it (3.0).
Provenance
DWR station abbreviation DLFDT1CO; recorded station name “DON LA FONT DITCH NO. 1 AT PIEDRA PASS”; 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.