BNSF Mosquito Creek Bridge #12

In 1870, the Sabula, Ackley & Dakota Rail Road (SA&D) constructed a 21-mile railroad line, extending from the Mississippi River at Sabula, Iowa to Preston, Iowa. The following year, an additional 12 miles were completed to Delmar, Iowa.  In 1872, an additional 54 miles were completed to Marion, Iowa.  In 1872, the SA&D was conveyed to the Milwaukee & St. Paul Railway (M&StP), which reorganized as the Chicago, Milwaukee & St. Paul Railway (Milwaukee Road) in 1874. In 1882, the Milwaukee Road completed an additional 257 miles between Marion and Council Bluffs, Iowa; completing a mainline from the Mississippi River to the Missouri River.  The same year, a bridge across the Mississippi River was completed at Sabula, which connected to the existing Milwaukee Road system in Illinois.  By the late 19th Century, the Milwaukee Road had developed a large railroad network throughout the Midwest.  This line quickly became a principal mainline for the Milwaukee Road, and allowed for the connection and construction of other branch lines throughout Iowa. 

In 1901, a short 12-mile cutoff was completed between Green Island, Iowa and Browns Junction, Iowa; which shortened the distance and provided better grades.  The original line was retained as a second track.  In the early 20th Century, the Milwaukee Road was aware of the importance of this line, and a massive construction project was planned to modernize the line.  Between 1912 and 1915, the line between Green Island and Manilla, Iowa was extensively rebuilt, with a second track constructed and large sections of line relocated.  The result was one of the most modern double track lines in Iowa, complete with smooth curves, gentle grades and new bridges.  After completion of the project, some short sections of the original line were retained as spurs, which were abandoned by the early 1920s.  The Milwaukee Road failed to accurately project the level of traffic over this line, and traffic never reached the threshold that required a double track line. The Milwaukee Road was often in financial trouble, especially after the costly Pacific Extension was completed in 1909. In 1925, the company declared bankruptcy, and reorganized as the Chicago, Milwaukee, St. Paul and Pacific Railroad in 1928.  Despite the financial strain, this line remained an important mainline for the Milwaukee Road.  Segments between Marion and Covington, Iowa; Newhall, Iowa and Collins, Iowa; and Madrid, Iowa and Templeton, Iowa were reduced to a single track in 1934.  The segment between Green Island and Paralta, Iowa was reduced to a single track in 1950; the segment between Paralta and Marion in 1954; the segment between Collins and Madrid, Iowa in 1956 and the segment between Covington and Newhall in 1964.  In addition, the original line east of Browns Junction was abandoned in 1950.  Financial hardship continued through the 20th Century for the Milwaukee Road, and the railroad again filed bankruptcy in 1977.  In 1980, the Milwaukee Road decided to abandon the entire Iowa Division mainline.  The segment between Bayard, Iowa and Council Bluffs was sold to Burlington Northern Railroad (BN).  Segments between Perry, Iowa and Bayard and between Slater, Iowa and Woodward were sold to the Chicago & North Western Railway (C&NW).  A short segment at Marion was sold to the Chicago Central & Pacific Railroad (CC).

In 1985, the segment between Herndon and Bayard was abandoned by the C&NW.  In 1995, the C&NW was purchased by Union Pacific Railroad (UP).  In 1996, BN merged with the Atchison, Topeka & Santa Fe Railway to form BNSF Railway.  The CC was purchased by Illinois Central Railroad (IC) in 1996, and the IC was purchased by Canadian National Railway (CN) in 1998.  In 1999, the segment between Dawson, Iowa and Herndon was abandoned by UP.  In 2002, most of the segment at Marion was abandoned by CN.  Between 2003 and 2004, the remaining portions between Slater and Woodward and between Perry and Dawson were abandoned by UP.  Today, BNSF operates the Bayard to Council Bluffs segment as the Bayard Subdivision, and CN still operates a short segment of line in Hiawatha.  Linn County has developed large sections around Marion into the Grant Wood Trail.  A section west of Rhodes, Iowa has been reused as a trail; and segments between Collins and Slater have been reused as the Heart of Iowa Nature Trail.  Much of the line between Slater and Perry has been reused as the High Trestle Trail; and the line between Perry and Herndon has been reused as the Raccoon River Valley Trail.  Remaining segments have been abandoned, with much of the right-of-way still intact.  In addition, large segments of the original right-of-way that was replaced in the early 20th Century remain intact.