The Lucin Cutoff And Great Salt Lake Causeway
Almost everyone knows something about the famous meeting at Promontory, Utah in May, 1869 between the Central Pacific and Union Pacific
which completed the Transcontinental Railroad. However, under one plan engineers
had hoped to do so via a water level grade across the Great Salt Lake
and bypass the steep, mountainous terrain northwest of the body of the
water. The CP, of course, became part of the Southern Pacific system
and it was not until around 1900 that serious consideration and planning
began for what became known as the Lucin Cutoff. This first engineering
feat to span the lake was constructed with both rock fill and timber
trestles. It remained in use until the 1950s when the SP decided a
replacement structure was needed, the Great Salt Lake Causeway that did
away with (mostly) trestles and instead was a earthen right-of-way that
split the body of water into two sections. Despite sometimes a
maintenance headache, it is still in use today by successor Union Pacific.
In an attempt to keep costs low and time short in rushing to complete
the Transcontinental Railroad a low-grade line across the Great Salt
Lake was shelved. This would require the Central Pacific to build a
circuitous and steep route around the lake with grades peaking at 2.2%.
Beginning at Lucin the line headed northeast through the Promontory
Mountains with much of the grading work to Promontory Summit carried out
by Benson, Farr, & West. After the ceremonies of May 10, 1869
interestingly the CP abandoned its grade that continued on from
Promontory to Ogden in favor of the Union Pacific alignment. In 1885 the CP became a part of the growing Southern Pacific system and through the end of the 19th century the original alignment
from Ogden to Lucin, around the lake and a distance of 146 miles
through mountains that rose 700 feet above the lake, was the main line
In 1899 plans finally commenced
on a water level route that would directly span the lake to its north
with Lucin as the western terminus of the old alignment. The Ogden & Lucin Railroad was a paper company created for the express purpose of building the new Cutoff with work
officially beginning in March of 1902. It is interesting that while
the original route across the water is often thought of as an incredibly
long trestle, this only constituted about 12 miles of the distance. It
was originally hoped that the route would be a causeway, similar to
what was built later. However, construction techniques
at the time, while advanced, were not able to stabilize the
right-of-way, as it kept sinking below the water's surface. As a
result, engineers decided on a more conventional approach; long earthen approaches built of stone-fill with a wooden trestle in the center.
From there the line clipped the southern edge of Promontory Point and
then continued on through another short fill before exiting to the
eastern shoreline. The route was wide enough to accommodate two tracks
and shaved off 43 miles of the original alignment as it was now only 103
miles between Ogden and Lucin. Interestingly, Salt Lake City officials
had hoped to lure the railroad directly through their town. However,
this would have required an additional 70 miles of railroad to be
constructed and the company did not see the need for such an expense.
In the end, the original Lucin cutoff cost $4.5 million to build and
officially opened to all through traffic on January 1, 1905.
Surprisingly, the SP still used the original line for several years
after the new route was opened, naming it the Promontory Branch to serve
remaining shippers and passengers.
After nearly 10 years of failed attempts the railroad was finally able to abandon much of the line after June, 1942 which consisted of about 55 miles of track. As for the Lucin Cutoff, its final chapters are being written following World War II. The wooden trestle was showing considerable age by this time after five decades of constant use. It was becoming a bottleneck as trains were forced to crawl over the structure at only 15 mph as the structure swayed and buckled. Age was not the only reason the SP was looking to update its cutoff. It was also worried about fire to the wooden supports and ties, whether through a natural occurrence or intentionally. As such, in 1950 the company began primarily studies to construct a new alignment that would be a full length, earthen causeway built entirely of stone fill.
Work on the Great Salt Lake Causeway began in 1955, contracted to the Morrison-Knudsen Company (today, well known for its work on locomotives). To reduce costs the Southern Pacific elected to reuse the original eastern and western approaches with the primary work meant to replace the roughly 12 miles of trestle. The new alignment would be about 1,500 feet to the north of the bridge and required nearly 30 feet of sediment from the lake's floor to be dredged to reach bedrock for the rock fill to sustain a solid foundation. After four years of work the Great Salt Lake Causeway's right-of-way was completed on July 9, 1959 and turned over to the SP for final track laying and signaling. This took another month to finish and by late August trains were once again rolling across the lake. The original trestle remained were it stood and its remnants can still be seen today. For more about the history of the cutoff's construction please click here.
In the mid-1980s a 300 foot trestle interestingly had to be reinstalled
to allow for the lake to flow properly as the northern arm was several
feet lower than its southern counterpart. The 1980s also saw the
causeway nearly swamped due to the lake's unpredictable water levels.
It had to be closed several times because of washouts and cost the
railroad $85 million in maintenance repairs during the decade. Since
that time, however, the lake has never flooded as heavily. Today, the
Great Salt Lake Causeway remains an important artery in the Union
Pacific's system (since its 1996 takeover of SP) despite the fact that
it has a parallel route to Salt Lake City via the old Western Pacific alignment.
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