BNSF Court Avenue Bridge (Chariton)


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Name BNSF Court Avenue Bridge (Chariton)
Chicago, Burlington and Quincy Railroad Bridge #334.07
Built By Chicago, Burlington & Quincy Railroad
Currently Owned By BNSF Railway
Builder Chicago, Burlington & Quincy Railroad Company Forces
Length 88 Feet Total, 32 Foot Main Span
Width 2 Tracks
Height Above Ground 11 Feet 0 Inches
Superstructure Design Concrete Encased Beam and Concrete Slab
Substructure Design Concrete
Date Built 1928
Traffic Count 25 Trains/Day (Estimated)
Current Status In Use
Chicago, Burlington & Quincy Railroad Bridge Number 334.07
BNSF Railway Bridge Number 334.07
Significance Local Significance
Documentation Date 8/4/2019

In May 1854, the Burlington and Missouri River Railroad (B&MR) began constructing a new mainline across southern Iowa, with the goal of connecting the Mississippi River at Burlington, Iowa to the Missouri River near Omaha, Nebraska.  In 1857, the first 34 miles between Burlington and the Skunk River near Rome, Iowa were completed.  In 1859, an additional 41 miles between the Skunk River and Ottumwa, Iowa were completed.  The railroad ceased progress during the Civil War, and eventually continued west in 1866.  That year, an additional 24 miles were completed between Ottumwa and Albia, Iowa.  Work continued in 1867, when an additional 46 miles were completed to Woodburn, Iowa.  Between 1867 and 1868, the Chicago, Burlington & Quincy Railroad (CB&Q) constructed a bridge across the Mississippi River to connect this line to their lines in Chicago.  In 1868, an additional 34 miles opened west to Afton, Iowa; followed by an additional 59 miles west to Red Oak, Iowa in 1869 and an additional 32 miles to the Pacific Junction, Iowa in 1870.  In 1872, the B&MR was leased by the CB&Q; and was fully absorbed by the company in 1875.  In the 1870s, the line would be extended into Nebraska, and in 1880, a bridge was constructed across the Missouri River at Plattsmouth.   

This line formed a critical backbone for the CB&Q, connecting Chicago to territories west of the Missouri River.  By the late 1870s, the need for a second track on this route had become apparent.  A second track was constructed between Chillicothe, Iowa and Albia in 1879, including a new alignment around the south side of Albia.  In 1880, a second track was constructed between Burlington and West Burlington, Iowa; as well as between Albia and Russell, Iowa.  In 1885, a second track was constructed between Russell and Chariton, Iowa; followed by between Ottumwa and Chillicothe the following year.  A large segment of second track opened between West Burlington and Mt. Pleasant, Iowa in 1889.  By the turn of the 20th Century, several sections of this line required extensive upgrades in addition to a second track.  In 1900, a second track was completed from Mt. Pleasant to Ottumwa and from Chariton to Creston, Iowa.  A new alignment was constructed between Fairfield, Iowa and Batavia, Iowa; and between Agency, Iowa and Ottumwa in 1900.  In 1901, the line was double tracked between Chariton and Creston.  The 1901 work involved constructing a second single track alignment between Indianola Junction and Lucas, Iowa; between Woodburn and Osceola, Iowa and between Murray, Iowa and Creston.  Between 1902 and 1905, the Creston to Pacific Junction segment was double tracked.  In 1904, a realignment between Nodaway, Iowa and Emerson, Iowa opened to traffic; followed by a large realignment between Malvern, Iowa and Pacific Junction in 1905.

Throughout the 20th Century, this line remained critical to the CB&Q.  The CB&Q invested significant capital into maintaining this line, replacing bridges, revising grades and changing the alignment in spots.  One of the most prominent changes came in 1949, when the westbound track near Frederic, Iowa was straightened, to eliminate a segment of curvy original mainline.  In 1970, CB&Q merged with Northern Pacific Railway and Great Northern Railway to form Burlington Northern Railroad (BN).  Several segments of this line were single tracked in the mid to late 20th Century.  In 1996, BN merged with Atchison, Topeka & Santa Fe Railway to form BNSF Railway, the current owner of this line.  Today, this line remains a critical piece of railroad infrastructure.  BNSF currently operates a portion of the Ottumwa Subdivision between Burlington and Creston; and a portion of the Creston Subdivision between Creston and Pacific Junction.  


Located in downtown Chariton, this concrete bridge carries a former Chicago, Burlington & Quincy Railroad mainline over Court Avenue (Business US Highway 34). In the 1920s and 1930s, the Iowa State Highway Commission worked to improve major highways across Iowa. One of the early projects was upgrading US Highway 34 across Iowa by constructing grade separations with the CB&Q and paving the roadway. In early 1928, an agreement was reached with the CB&Q to construct an underpass at Court Avenue. Work on the underpass began in March of that year, and was completed by November 1928. Currently, the bridge consists of a 32-foot concrete encased beam span, approached by two 14-foot concrete slab spans on either end. The entire bridge is set onto concrete substructures, and was constructed for two tracks. The main span follows a standard design, with eight beams per track arranged into two sets of four. These beams are encased in a thick concrete slab with no decorative features. The approach spans follow a simple design, and also have no decorative features. The main piers consist of concrete columns, connected by a concrete beam; while the approach piers use a standard rectangular shape. The abutments also use a standard design, with short sloped backwalls. Labor employed by the CB&Q constructed the entire bridge, while the excavation and paving was handled by separate contracts. This type of bridge was popular for railroad use, particularly in urban areas. The design provided greater safety for the public underneath by offering a solid floor design, while the solid floor design also helped reduce maintenance. Since the initial construction, the bridge had seen no significant alterations, and remains in regular use. Overall, the bridge appears to be in fair condition, with no significant deterioration noted. The author has ranked the bridge as being locally significant, due to the common design.


Citations

Builder and build date Chariton Leader; March 20, 1928
Railroad History Citation ICC Valuation Information, Compiled by Richard S. Steele

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