The St. Paul Pass Tunnel
One of the Milwaukee Road's most famous tunnels along its Pacific Coast
Extension was located in the Bitterroot Mountains at St. Paul Pass along
the border of Idaho and Montana. One of the tougher sections of the
route to survey
and build due to its remoteness it took crews nearly two years to lay
out all possible routes before engineers and the railroad eventually
chose the route over the pass and begin construction. The tunnel, nearly a mile high
in elevation and over a mile in length, became unique in that part of
it lay in the state of Montana while the other part lay in the state of
Idaho. Today, the tunnel, also known as Taft Tunnel, has not
seen a train in more than 30 years although it is now part of the "Route
of the Hiawatha" rail/trail.
Few rail lines, let alone railroads, have garnered such interest,
intrigue, and awe as the Chicago, Milwaukee, St. Paul & Pacific
Railroad's Pacific Coast Extension, even 30 years since it was
abandoned. Unfortunately, the best engineered rail line through the
rugged Cascades could not save it from the inept decision making of
management at the time and it is now but weeds and trails, a vital
transportation artery no longer available to shippers and the American
economy. In 1901 the first surveying work began and it was estimated
the more than 1,400-mile western extension would cost the railroad
around $45 million adding more than 25% to its total system mileage.
However, four years later this number was readjusted to $60 million. What made the extension so terribly expensive was partly due to the right-of-way costs. Unlike the Great Northern and Northern Pacific the CM&StP was not given free government land grants and had to both purchase all of its land from private landowners as well as take over a number of small, new, or floundering railroads across the region. Amazingly, in just three short years the entire extension had been completed and on May 19, 1909 a Golden Spike was driven at Garrison, Montana commemorating the opening of the new route.
Surveying a route west of Butte,
Montana began in earnest as early as November 1, 1904 when the first
crews set out to begin the arduous process of laying out the best rail
line through thousands of square miles of wilderness and steep,
mountainous terrain using the standard tools of the day; transits,
stadia rods, and barometers. The route surveyed over St. Paul Pass,
which was ultimately chosen by the railroad, began in August 1906 and
was completed in November of that year.
Surveying this section and the area it covered is somewhat
staggering. The railroad estimated that for every one mile of grade
which was ultimately chosen as part of the main line up to 4.5 miles was
surveyed and documented. In total, between Butte and the pass
some 1,040 miles was surveyed with the actual main line covering those
two points being only 230 miles in length. Contract work for the
building of the St. Paul Pass Tunnel was done by Winston Brothers
Company of Minneapolis, Minnesota, which also handled much of the
grading and construction between Missoula and the pass with the primary subcontract work carried out by contractors W.B. Cronk, A.D. McDougal & Company, Stewart & Welch, and Street & Lusk.
Heading west from Missoula grading began in July 1906. Around this
same time work was also started on the tunnel with its approaches
completed in 1906 although heavy boring work did not begin until late
1907. Overall the gradient of the tunnel was kept at a
manageable 1.7% while its overall length to span the Bitterroots was
1.66 miles! The tunnel was officially completed in December, 1908
giving the Milwaukee Road its second-longest tunnel across its Pacific Coast Extension. For the railroad, which numbered its tunnels from east to west,
the structure at St. Paul Pass was officially listed as #20.
also became known as Taft Tunnel due to its close proximity to the tiny
hamlet of Taft, Montana near the state line. However, the railroad
came to know this location as East Portal, as it was the location of one
of the substations after the line was electrified a few years following the tunnel's opening.
the Milwaukee Road abandoned its Pacific Coast Extension in March, 1980
the tunnel sat dormant and empty for more than 20 years before it was
officially "rededicated" on June 23, 2001 as part of the "Route of the
Hiawatha" rail/trail. Today, the tunnel sees thousands of
hikers and bikers annually.
Related Reading You May Enjoy
St. Paul Pass