Hydrohistorian
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Laramie Poudre Tunnel @ 10 Ft Parshall Flume
Transbasin diversion gage · LAPTUNCO · USGS 06747000 · Division 1 · Water District 48 · Larimer 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
What this gage meters
This is not a natural stream record. The Laramie-Poudre Tunnel moves water from Laramie River (Div 1, WD 48) into Cache la Poudre River (Div 1, WD 3), operated by Water Supply & Storage 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
Chart: annual mean flow at Laramie Poudre Tunnel @ 10 Ft Parshall Flume, water years 1931 to 2026. The measured record is decreasing at -1.2 cubic feet per second per decade. A Pettitt changepoint is detected around 1966. The underlying yearly values are available as a CSV download linked at the top of this page.
This gage measures the Laramie-Poudre Tunnel, water carried across the Continental Divide. It is taken from Laramie River (Div 1, WD 48) and delivered to Cache la Poudre River (Div 1, WD 3) — so what this gage reads leaves one river basin for good and arrives in another.
The two ends: Laramie River Tunnel Sys (source, on Laramie River); Laramie Poudre Tunnel Release Structure (receiving, on Cache La Poudre River)
- Decree in case 17CW3057 ↗ · imaged 2020-10-09 · filed under the source end, Laramie River Tunnel Sys
- Decree in case 18CW3076 ↗ · imaged 2020-10-07 · filed under the source end, Laramie River Tunnel Sys
- Decree in case 11CW0265 ↗ · imaged 2015-07-21 · filed under the source end, Laramie River Tunnel Sys
- Decree in case 07CW0190 ↗ · imaged 2014-11-12 · filed under the source end, Laramie River Tunnel Sys
- Decree in case 06CW0259 ↗ · imaged 2013-01-29 · filed under the source end, Laramie River Tunnel Sys
- Decree in case 06CW0258 ↗ · imaged 2012-01-11 · filed under the source end, Laramie River Tunnel Sys
- Decree in case 03CW0422 ↗ · imaged 2011-06-16 · filed under the source end, Laramie River Tunnel Sys
- Decree in case CA2725 ↗ · imaged 2008-02-28 · filed under the source end, Laramie River Tunnel Sys
- Decree in case 87CW0332 ↗ · imaged 2005-10-28 · filed under the source end, Laramie River Tunnel Sys
- Decree in case 17CW3057 ↗ · imaged 2020-10-09 · filed under the receiving end, Laramie Poudre Tunnel Release Structure
- Decree in case 18CW3076 ↗ · imaged 2020-10-07 · filed under the receiving end, Laramie Poudre Tunnel Release Structure
- Decree in case 11CW0265 ↗ · imaged 2015-07-21 · filed under the receiving end, Laramie Poudre Tunnel Release Structure
- Decree in case 03CW0421 ↗ · imaged 2012-05-08 · filed under the receiving end, Laramie Poudre Tunnel Release Structure
- Decree in case 03CW0422 ↗ · imaged 2011-06-16 · filed under the receiving end, Laramie Poudre Tunnel Release Structure
- Decree in case W9385 ↗ · imaged 2005-08-24 · filed under the receiving end, Laramie Poudre Tunnel Release Structure
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 LAPTUNCO; recorded station name “LARAMIE POUDRE TUNNEL @ 10 FT PARSHALL FLUME”; 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.