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Homestake Tunnel

Transbasin diversion gage · HOMTUNCO · USGS 09063700 · Division 2 · Water District 11 · Lake 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

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 Homestake Tunnel moves water from Homestake Creek, Eagle River basin (Div 5) into Turquoise Lake, Arkansas River basin (Div 2), operated by Colorado Springs Utilities / Aurora 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

Period of record
1966-10-01 → 2026-09-27
Daily values
21,544
Flowing now
0.0 cfs 2026-10-16 11:30, 3.4 h ago
Latest cached reading
0.0 cfs (2026-09-27)
Trend
no trend, -0.7 cfs/decade (-2.1% of median)

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 Homestake Tunnel, water years 1966 to 2026. The measured record is no trend at -0.7 cubic feet per second per decade. The underlying yearly values are available as a CSV download linked at the top of this page.

Loading chart…

This gage measures the Homestake Tunnel, water carried across the Continental Divide. It is taken from Homestake Creek, Eagle River basin (Div 5) and delivered to Turquoise Lake, Arkansas River basin (Div 2) — so what this gage reads leaves one river basin for good and arrives in another.

The two ends: Homestake Proj Tunnel (source, on Homestake Creek); Homestake Tunnel Outlet (receiving, on Lake Fork); Homestake Tunnel Outlet (receiving, on Lake Fork)

Decrees:

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 HOMTUNCO; recorded station name “HOMESTAKE 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.