Hydrohistorian
Twin Lakes Tunnel
Transbasin diversion gage · TWITUNCO · USGS 09073000 · Division 2 · Water District 11 · Lake County
Live gage at DWR ↗ · USGS monitoring location ↗ · Download daily record (CSV)
What this gage meters
This is not a natural stream record. The Twin Lakes Tunnel moves water from Roaring Fork headwaters at Independence Pass (Div 5) into Lake Creek to Twin Lakes, Arkansas basin (Div 2), operated by Twin Lakes Reservoir & Canal Co. — 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
Where it sits
Location as DWR records it (5.0).
Provenance
DWR station abbreviation TWITUNCO; recorded station name “TWIN LAKES TUNNEL”; 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.