This Pratt through truss bridge and through plate girder bridge carries a former Illinois Central Railroad mainline over the Boyer River alongside US Highway 30 southwest of Denison

Denison, Crawford County, Iowa

Owner: Canadian National Railway

Status: In Use

Built 1899 and 1948 using a span fabricated 1899

by

American Bridge Works of Chicago, Illinois and Unknown

for

Illinois Central Railroad

Design:
127' Pratt through truss, 2-45' through plate girders and timber pile trestle

Description:
Pratt through truss bridge and through plate girder bridge over Boyer River

Significance:

This through plate girder bridge carries a former Illinois Central Railroad mainline over the East Boyer River in Denison

Denison, Crawford County, Iowa

Owner: Canadian National Railway

Status: In Use

Built 1966

by

American Bridge Company of New York

for

Illinois Central Railroad

Design:
79' through plate girder and 2-48' and 1-12' steel stringers

Description:
Through plate girder bridge over East Boyer River

Significance:

This through plate girder bridge carries a former Illinois Central Railroad mainline over an unnamed alongside US Highway 30 and Lincoln Way between Denison and Arion

Denison, Crawford County, Iowa

Owner: Canadian National Railway

Status: In Use

Built 1920 using spans fabricated c. 1895

by

Unknown

for

Illinois Central Railroad

Design:
2-35' deck plate girders

Description:
Deck plate girder bridge over Willow Creek

Significance:

This large Warren through truss bridge carries a former Chicago & North Western Railway mainline over the Boyer River alongside US Highway 30 between Arion and Denison

Denison, Crawford County, Iowa

Owner: Union Pacific Railroad

Status: In Use

Built 1948

by

American Bridge Company of New York and Condon-Cunningham Company of Omaha, Nebraska

for

Chicago & North Western Railway

Design:
175' Warren through truss and 2-48' steel stringers

Description:
Warren through truss bridge over Boyer River

Significance:

This unique triple tracked quadrangular lattice through truss bridge once carried a former Chicago & North Western Railway mainline over the East Boyer River in Denison

Denison, Crawford County, Iowa

Owner: Union Pacific Railroad

Status: Replaced by a new bridge

Built 1910

by

American Bridge Company of New York and Unknown

for

Chicago & North Western Railway

Design:
120' quadrangular lattice through truss and 50' through plate girder

Description:
Quadrangular lattice through truss bridge over East Boyer River

Significance: