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Moffat Water Tunnel at East Portal

Transbasin diversion gage · MOFTUNCO · USGS 09022500 · Division 1 · Water District 6 · Gilpin 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 Moffat Water Tunnel moves water from Fraser River collection system (Div 5) into South Boulder Creek (Div 1), operated by Denver 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
1936-05-31 → 2026-09-27
Daily values
35,500
Flowing now
15.6 cfs 2026-10-13 02:30, 3.5 h ago
Latest cached reading
18.0 cfs (2026-09-27)
Trend
decreasing, -2.04 cfs/decade (-3.0% 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 Moffat Water Tunnel at East Portal, water years 1936 to 2026. The measured record is decreasing at -2.04 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 Moffat Water Tunnel, water carried across the Continental Divide. It is taken from Fraser River collection system (Div 5) and delivered to South Boulder Creek (Div 1) — so what this gage reads leaves one river basin for good and arrives in another.

The two ends: Moffat Water Tunnel (source, on Fraser River); Moffat Tunnel Collection System - Hurd C (source, on Hurd Creek); Moffat Tunnel Collection System - Trail (source, on Trail Creek); Moffat Tunnel (receiving, on South Boulder Creek)

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 (4.0).

Provenance

DWR station abbreviation MOFTUNCO; recorded station name “MOFFAT WATER TUNNEL AT EAST PORTAL, CO.”; 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.