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Hoosier Pass Tunnel at Montgomery Reservoir near Alma

Transbasin diversion gage · HSPTUNCO · Division 1 · Water District 23 · Park 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 Hoosier Pass Tunnel moves water from Blue River headwaters (Div 5) into Montgomery Reservoir, Middle Fork South Platte (Div 1), operated by Colorado Springs Utilities (Continental-Hoosier project) — 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
1953-04-30 → 2026-10-02
Daily values
27,484
Latest cached reading
0.1 cfs (2026-10-02)
Trend
no trend, -0.25 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 Hoosier Pass Tunnel at Montgomery Reservoir near Alma, water years 1953 to 2026. The measured record is no trend at -0.25 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 Hoosier Pass Tunnel, water carried across the Continental Divide. It is taken from Blue River headwaters (Div 5) and delivered to Montgomery Reservoir, Middle Fork South Platte (Div 1) — so what this gage reads leaves one river basin for good and arrives in another.

The two ends: Con-Hoosier Lower Blue Lake (source, on Blue River); Con-Hoosier Mayflower Lake (source, on Spruce Creek); Con-Hoosier Spruce Lake (source, on Spruce Creek); Con-Hoosier Upper Blue Lake (source, on Blue River); Con-Hoosier Sys Blue River Ditch (source, on Blue River); Con-Hoosier Sys Crystal Ditch (source, on Spruce Creek); Con-Hoosier Sys Ditch Intercepted Flows (source, on Blue River); Con-Hoosier Sys Mccullough Ditch (source, on Mccullough Gulch Creek); Con-Hoosier - East Hoosier Ditch Claim 1 (source, on Hoosier Creek); Con-Hoosier - Ditch Claim 2 (source, on Blue River); Con-Hoosier Sys Spruce Ditch (source, on Spruce Creek); Con-Hoosier Sys East Hoosier Ditch (source, on Hoosier Creek); Con-Hoosier Tunnel (source, on Blue River); Montgomery Res (receiving, on Middle Fork South Platte)

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 HSPTUNCO; recorded station name “HOOSIER PASS TUNNEL AT MONTGOMERY RESERVOIR NEAR ALMA”; 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.