Hydrohistorian
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Busk-Ivanhoe Tunnel
Transbasin diversion gage · BUSTUNCO · USGS 09077500 · 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 Busk-Ivanhoe Tunnel moves water from Ivanhoe, Lyle, Hidden Lake and Pan Creeks, Fryingpan basin (Div 5) into Busk Creek to Turquoise Lake, Arkansas basin (Div 2), operated by Pueblo Board of Water Works & Aurora Water (Busk-Ivanhoe system) — 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 Busk-Ivanhoe Tunnel, water years 1948 to 2026. The measured record is decreasing at -0.9 cubic feet per second per decade. A Pettitt changepoint is detected around 1986. The underlying yearly values are available as a CSV download linked at the top of this page.
This gage measures the Busk-Ivanhoe Tunnel, water carried across the Continental Divide. It is taken from Ivanhoe, Lyle, Hidden Lake and Pan Creeks, Fryingpan basin (Div 5) and delivered to Busk Creek to Turquoise Lake, Arkansas basin (Div 2) — so what this gage reads leaves one river basin for good and arrives in another.
The two ends: Busk-Ivanhoe System Oper (source); Busk-Ivanhoe System (receiving, on Fryingpan River)
- Decree in case 09CW0142 ↗ · imaged 2018-09-11 · filed under the receiving end, Busk-Ivanhoe System
- Decree in case 84CW0178 ↗ · imaged 2006-10-11 · filed under the receiving end, Busk-Ivanhoe System
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 BUSTUNCO; recorded station name “BUSK-IVANHOE 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.