Gunnison Tunnel GP

The Gunnison Tunnel is a 5.8 mile irrigation tunnel constructed between 1905 and 1909 by the Bureau of Reclamation to divert water from the Gunnison River to the Uncompahgre . At the time of its completion, it was the longest irrigation tunnel in the world.  It only runs water during the irrigation season.

The tunnel's West Portal opens up into the South Canal which both produces hydroelectric power and delivers water as part of the Uncompaghre Project.  The South Canal extends from the end of the Gunnison Tunnel generally southwest 11.4 miles to the Uncompahgre River. Part of the canal is concrete lined and part is unlined.  

The South Canal includes 3 additional tunnels, 3 hydroelectric stations and numerous branch canals.  This trip takes you along the upper part of the canal so you can see the lined and unlined portions, the tunnels and the hydroelectric stations.  A short trip that can be done by most vehicles.

This canal dipper, for lack of a better term, rotates counterclockwise by canal current.  The barrels pick up water and spill it into a trough.   A pipe drains water from the trough into a small irrigation ditch.  Just a short distance from US 50 at the north end of this trail.

There is a GPS - GPX track at the bottom of this page.
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Canal dipper
The West Portal of the Gunnison Tunnel emerges quite a bit below the natural surface of the ground.  The canal drops 350' on its journey to the Uncompaghre, and this drop is harnessed to produce electricity.
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West Portal
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Hydroelectric station
Hydroelectric stations absorb some of the elevation drop, but the rest is simply water running downhill.  Small elevation drops are handled differently than large elevation drops.
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Small elevation drop
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Large elevation drop
Some of the canal is lined and some is unlined.
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Lined canal
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Unlined canal
There are 3 tunnels included in South Canal. The canal road leaves each tunnel entrance then climbs the hills and drops back down to the tunnel exit.
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Climbing from tunnel entrance
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Tunnel exit
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Climbing from tunnel entrance
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Tunnel exit
This track follows less than half of South Canal's length then heads for Montrose.  There is no public access to the canal road south of this point.

​Updated 2018.
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