Hydrohistorian
← Basin trends · All gages in this district
August P. Gumlick Tunnel near Jones Pass
Transbasin diversion gage · APGTUNCO · Division 1 · Water District 7 · Clear Creek 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
What this gage meters
This is not a natural stream record. The August P. Gumlick Tunnel moves water from Williams Fork headwaters at Jones Pass (Div 5) into West Fork Clear Creek (Div 1), operated by Denver Water — 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 August P. Gumlick Tunnel near Jones Pass, water years 1940 to 1999. The measured record is decreasing at -2.35 cubic feet per second per decade. A Pettitt changepoint is detected around 1955. The underlying yearly values are available as a CSV download linked at the top of this page.
This gage measures the August P. Gumlick Tunnel, water carried across the Continental Divide. It is taken from Williams Fork headwaters at Jones Pass (Div 5) and delivered to West Fork Clear Creek (Div 1) — so what this gage reads leaves one river basin for good and arrives in another.
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 (5.0).
Provenance
DWR station abbreviation APGTUNCO; recorded station name “AUGUST P. GUMLICK TUNNEL NEAR JONES 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.