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Iowa State Highway Commission

of Ames, Iowa
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On April 13, 1904, the 30th General Assembly and Governor A.B. Cummins approved House File 371, an act that created the Iowa State Highway Commission (ISHC). The commission was originally established as part of the Iowa State College of Agriculture and Mechanic Arts (today the Iowa State University of Science and Technology) in Ames.

The commission’s principal duties were to provide information and act as an administrative advisory agent to the local jurisdictions. Although severely handicapped by a biennial appropriation of $7,000, the commission was to conduct public highway demonstrations, disseminate information to county supervisors, formulate standards for highway repair and construction, investigate the road problems of Iowa, and record and report progress to the governor each fiscal year.

The work was assigned to the divisions of Agriculture and Engineering, directed by C.F. Curtiss and Anson Marston, respectively. Other staff members included Thomas MacDonald, H.M. Bainer, and J.T. Hoover.

While productive, the commission remained hindered by the lack of funds and necessary specialized skills. The commission needed additional funds to carry on “extensive laboratory tests of properties of Iowa road materials, and to build sections of experimental roads, to give actual working tests of material and methods of construction suited to Iowa’s special needs.” Other initiatives included testing and designing concrete culverts and bridges, compiling and publishing road census information, and extending the effort to map county roads in Iowa.

To alleviate the problems inherent in the “disproportionate” relationship between results and expenditures, the commission invested in conducting a road school in June 1905. Split between discussion and demonstration, students received instruction on culvert construction and road machinery, and tools of highway engineers, and listened to lectures by experienced engineers.

On April 9, 1913, the IHC separated from the Iowa State College, becoming an independent state-administered organization, managed by a three-member commission, comprised of Anson Marston, H.C. Beard and J.W. Holden.

Immediately, in conjunction with the Department of Justice, the newly organized IHC attempted to resolve many detrimental business practices that undermined the needs of the state. First, the IHC noticed that the state was divided into districts by supply and bridge companies, allowing insufficient competition and limited oversight. To adequately tackle such tremendous responsibilities, the IHC increased its personnel and re-organized itself into four departments, namely the Office, Designing, Field, and Educational. The commission also was given supervisory control over all county and township road officials, although county supervisors and trustees remained directly in charge of road management and allotted funds.

The IHC continued to operate for 62 years, adapting to the changing needs of the state and making significant contributions to modern highway engineering and construction. Ultimately, it slowly became an integral part of state and federal legislative initiatives, gaining a national reputation for excellence.

By the late 1960s, it was clear that the existing transportation networks were in need of transformation. In 1969, Governor Robert Ray responded by initiating a transportation study by the Office of Planning and Programming. Over the next couple of years, the Task Force on Modernization of Iowa’s Transportation System, in conjunction with a Department of Transportation Study Committee, formed the legislative backbone of for Governor Ray’s transportation initiatives.

In 1974, the 65th Iowa General Assembly created the Iowa Department of Transportation (Iowa DOT), albeit through a long legislative process. It placed other modal agencies, including an Aeronautics Commission, under the department’s responsibility to promote more orderly and effective planning and funding of programs, and to achieve a more balanced transportation system.

In 1974, the legislature also created the Iowa Transportation Commission, consisting of seven members. Members are appointed by the governor and subject to Senate confirmation. No more than four persons can represent the same political party. Serving four-year terms, members are responsible for periodically reviewing programs of the department and making all major investment policy decisions.

For more than a century, the IHC and Iowa DOT have promoted the growth and betterment of Iowa’s transportation system. Still headquartered in Ames, the agency continues to serve the transportation needs of Iowa and its citizens.

The Iowa Department of Transportation and Iowa Transportation Commission, who remain headquartered in Ames, continue to serve the citizens of Iowa today.

Source: http://www.iowadot.gov/about/organizationalhistory.htm


100th Street Bridge (Story County, Iowa)
Built 1917
Stringer bridge over Bear Creek on 100th Street
Open to traffic

100th Street Bridge (Marshall County, Iowa)
Built 1916
Pony truss bridge over Dowd Creek on 100th Street
Open to traffic

10th Avenue Bridge (Benton County, Iowa)
Design
Concrete culvert bridge over Small Stream on 10th Avenue
Open to traffic

110th St. Willow Creek Bridge (Iowa County, Iowa)
Design, 1949
Steel stringer bridge over Willow Creek on 110th Street
Open to traffic

110th Street Bridge (Iowa County, Iowa)
Design
Bridge over Drainage on 110th Street
Open to traffic

120th Street Bridge (Muscatine County, Iowa)
Designer, 1937
Steel rigid frame bridge over an unnamed creek on 120th Street
Open to traffic

120th Street Bridge (Plymouth County, Iowa)
Built 1941
Through truss bridge over West Branch Floyd River on 120th Street
Open to traffic

130th Street Bridge (Story County, Iowa)
Built 1939
Lost through truss bridge over South Skunk River on CR E18
No longer exists

130th Street Bridge (Clay County, Iowa)
Lost Warren pony truss bridge over Ocheyedan River on 130th Street
Replaced by a new bridge

13th Street South Skunk River Bridge (Old) (Story County, Iowa)
Warren through truss bridge over Skunk River on 13th Street
Replaced by a new bridge

13th Street Squaw Creek Bridge (Old) (Story County, Iowa)
Built 1947
Lost Warren through truss bridge over Squaw Creek on 13th Street
Replaced by a new bridge

140th Street Bridge (Hancock County, Iowa)
Design, 1927
Concrete pony/through girder bridge over Boone River on 410 140th Street
Open to traffic

140th Street Bridge (Plymouth County, Iowa)
Built 1954
Pony truss bridge over Floyd River on 140th Street
Open to traffic

14th Avenue Bridge (Benton County, Iowa)
Design
Slab bridge over Small Stream on 14th Avenue
Open to traffic

150th Street Bridge (Story County, Iowa)
Designer, 1920
Through truss bridge over South Skunk River on 150th Street
Open to traffic

150th Street Bridge (Cedar County, Iowa)
Design, ca. 1920
Pony truss bridge over a branch of Rock Creek on 150th Street
Open to traffic

150th Street Culvert (Muscatine County, Iowa)
Design, 1941
Concrete culvert bridge over Pine Creek on 150th Street
Open to traffic

155th Street Bridge (Cedar County, Iowa)
Design, 1976
Pony truss bridge over Yankee Run on 155th Street
Open to traffic

160th Street Bridge (Iowa County, Iowa)
Design
Concrete rigid frame bridge over Drainage on 160th Street
Open to traffic

16th Avenue Viaduct (EB) (Linn County, Iowa)
Built 1937
Steel stringer bridge over Union Pacific Railroad & Rockford Road SW on 16th Avenue SW (EB)
Open to traffic

16th Street Bridge (Story County, Iowa)
Built 1958
Lost pony truss bridge over South Skunk River on 16th Street in Ames
Replaced, one span lays abandoned in a field on west side of waterway, span on the east side of the waterway removed from field in 2015

170th Street Culvert (Muscatine County, Iowa)
Design
Concrete culvert bridge over Drainage on 170th Street
Open to traffic

180th Avenue Bridge (Keokuk County, Iowa)
Built 1963
Pony truss bridge over South English River on 180th Avenue
Open to traffic

180th Street Bridge (Carroll County, Iowa)
Designer, 1913
Lost pony truss bridge over Storm Creek on 180th Street
Replaced by new bridge

180th Street Bridge (Wapello County, Iowa)
Design
Steel stringer bridge over Competine Creek on 180th Street
Open to traffic

180th Street Bridge (Story County, Iowa)
Built 1927
Through truss bridge over South Skunk River on 180th Street Bridge
Replaced by a new bridge

180th Street Bridge (Muscatine County, Iowa)
Built 1953
Steel stringer bridge over Pine Creek on 180th Street
Replaced by a new bridge

180th Street Bridge (Clinton County, Iowa)
Built 1949
Pony truss bridge over Silver Creek(West) on 180th Street in Welton
Replaced by a new bridge

181st Street Culvert (Muscatine County, Iowa)
Design
Concrete culvert bridge over Unnamed Tributary of Pine Creek on 181st Street
Open to traffic

185 Th/Farm Drive Bridge (Greene County, Iowa)
Built 1925
Steel stringer bridge over Dd #110 on 185 Th/Farm Drive
Open to traffic

185th Street Bridge (Audubon County, Iowa)
Built 1935
Steel stringer bridge over Tributary of East Branch West Nishnabotna on 185th Street
Intact but closed to all traffic

18th Avenue Bridge (Benton County, Iowa)
Slab bridge over Drainage on 18th Avenue
Open to traffic

18th Street Bridge (Black Hawk County, Iowa)
Built 1931
Lost Camelback through truss bridge over Cedar River on West 18th Street in Waterloo
Replaced

18th Street Culvert (Linn County, Iowa)
Design
Concrete culvert bridge over Small stream on 18th Street SW
Open to traffic

190th Avenue Bridge (Kossuth County, Iowa)
Built 1962
Pony truss bridge over Lindsey Creek on 190th Avenue
Intact but closed to all traffic

190th Street Bridge (Hancock County, Iowa)
Design, 1925
Concrete pony/through girder bridge over Boone River on Fm 330 190th Street
Open to traffic

19th Street Bridge (Benton County, Iowa)
Culvert over Small Stream on 19th Street
Open to traffic

1st Avenue Bridge (Dubuque County, Iowa)
Design, 1915
Arch bridge over North Fork Maquoketa River on 1st Avenue in Dyersville
Open to traffic

1st Street Bridge (Washington County, Iowa)
Design, 1930
Lost Bridge over North Fork Long Creek on 1st Street
Replaced by a new bridge

1st Street SW Bridge (Bremer County, Iowa)
Concrete culvert bridge over Dry Run on 1st Street SW
Open to traffic

200th Avenue Bridge (Clay County, Iowa)
Pratt through truss bridge over Little Sioux River on 200th Avenue
Removed but not replaced

200th Avenue Overpass (Lucas County, Iowa)
Designer, 1937
Arch bridge over BNSF Railroad on 200th Avenue
Open to traffic

200th Street Beaver Creek Bridge (Boone County, Iowa)
Built 1930
Steel stringer bridge over Beaver Creek on Local
Open to traffic

200th Street Beaver Creek Tributary Bridge (Boone County, Iowa)
Built 1915
Slab bridge over Beaver Creek Tributary on 200th Street
Open to traffic

200th Street Bridge (Plymouth County, Iowa)
Built ca. 1960
Pony truss bridge over Floyd River on 200th Street
Open to traffic

200th Street Middle Beaver Creek Bridge (Boone County, Iowa)
Built 1920
Steel stringer bridge over Middle Beaver Creek on 200th Street
Open to traffic

20th Street Bridge (Pottawattamie County, Iowa)
Design, 1925
Through truss bridge over Pigeon Creek on 20th Street
Open to traffic

210th Street Bridge (Cedar County, Iowa)
Design, 1964
Pony truss bridge over Sugar Creek on 210th Street
Replaced by a new bridge

210th Street Bridge (Boone County, Iowa)
Built 1920
Bridge over Beaver Creek on 210th street
Open to traffic

220th Street Bridge (Adams County, Iowa)
Design, ca. 1930
Through truss bridge over East Nodaway River on 220th Street in Corning
Open to traffic

220th Street Bridge (Marshall County, Iowa)
Built 1916
Slab bridge over Linn Creek on 220th Street
Open to traffic

22nd Avenue Bridge (Benton County, Iowa)
Stringer bridge over Pratt Creek on 22nd Avenue
Open to traffic

230th Street Bridge (Marshall County, Iowa)
Built 1917
Steel stringer bridge over Linn Creek on 230th Street
Open to traffic

230th Street Linn Creek Tributary Bridge (Marshall County, Iowa)
Slab bridge over Tributary of Linn Creek on 230th Street
Open to traffic

235th Trail Bridge (Harrison County, Iowa)
Built 1935
Pony truss bridge over Willow Creek on 235th Trail
Replaced by a new bridge

270th Street Bridge (Iowa County, Iowa)
Design
Slab bridge over Small Stream on 270th Street
Open to traffic

270th Street Bridge (Cedar County, Iowa)
Design, ca. 1930
Pony truss bridge over Crooked Creek on 270th Street
Open to traffic

270th Street Bridge #2 (Cedar County, Iowa)
Design
Concrete culvert bridge over Crooked Creek on 270th Street
Open to traffic

28th Street Bridge (Wapello County, Iowa)
Design, 1925
Slab bridge over Chippewa Creek on 28th Street
Open to traffic

290th Street Bridge (Clay County, Iowa)
Built 1913
Pony truss bridge over Ditch No. 61 on 290th Street
Open to traffic

2nd Avenue Bridge (Polk County, Iowa)
Built 1935
Haunched Deck Plate Girder bridge over Des Moines River on 2nd Avenue
Open

2nd Avenue Overpass (Polk County, Iowa)
Design, 1936
Rigid frame bridge over Birdland Drive on 2nd Avenue in Des Moines
Open to traffic

300th Street Bridge (Butler County, Iowa)
Concrete culvert bridge over Small stream on 300th Street
Open to traffic

300th Street Bridge (Delaware County, Iowa)
Concrete deck girder bridge over Small Stream on 300th Street
Open to traffic

305th Street Drainage Bridge (Buchanan County, Iowa)
Concrete culvert bridge over Drainage on 305th Street
Open to traffic

305th Street Drainage Bridge #2 (Buchanan County, Iowa)
Concrete culvert bridge over Drainage on 305th Street
Open to traffic

310th Street Bridge (Boone County, Iowa)
Built 1915
Slab bridge over Little Beaver Creek on 310th Street
Open to traffic

320th Street Bridge (Cedar County, Iowa)
Design, 1932
Pony truss bridge over West Branch Wapsinonoc Creek on 320th Street
Open to traffic

320th Street Bridge (Cedar County, Iowa)
Design, ca. 1930
Pony truss bridge over Middle Branch Wapsinonoc Creek on 320th Street
Open to traffic

320th Street Bridge (Clay County, Iowa)
Bridge over Little Muddy Creek on 240th Avenue
Removed

320th Street Overpass (Keokuk County, Iowa)
Built 1936
Steel stringer bridge over Iowa, Chicago, & Eastern Railroad on 320th Street
Open to traffic

330th Street Bridge (Cedar County, Iowa)
Design, ca. 1930
Pony truss bridge over Middle Branch Wapsinonoc Creek on 330th Street
Open to traffic on a Level B (Enter at your own risk) Road

340th Street Creek Bridge (Story County, Iowa)
Slab bridge over Local Creek on 340th Street
Open to traffic

340th Street Drainage Bridge (Story County, Iowa)
Slab bridge over Field drain on 340th Street
Open to traffic

360th Streeet SW Bridge (Johnson County, Iowa)
Built 1915
Steel stringer bridge over N Br Old Mans Creek on 360th Streeet SW
Open to traffic

370th Street Bridge (Mills County, Iowa)
Designer, ca. 1940
Pony truss bridge over Nishnabotna River on 370th Street
Open to traffic

3rd Street Bridge (Bremer County, Iowa)
Built 1917
Through truss bridge over Cedar River on 3rd Street SE in Waverly


500th Street Bridge (Johnson County, Iowa)
Concrete culvert bridge over Small Stream on 500th Street
Open to traffic

55th Avenue Bridge (Warren County, Iowa)
Built ca. 1950
Riveted Camelback Pratt through truss bridge over Middle River on 55th Avenue
Open to traffic

57th Street Trail Bridge (Benton County, Iowa)
Slab bridge over Small Stream on 57th Street Trail
Open to traffic

640th Avenue Bridge (Story County, Iowa)
Built 1923
Steel stringer bridge over East Branch Indian Creek on 640th Avenue
Replaced by a new bridge

6th Avenue Bridge (Cedar County, Iowa)
Design
Abandoned concrete rigid frame bridge over Big Ellhorn Creek on 6th Avenue
Derelict/abandoned

6th Street Bridge (Story County, Iowa)
Design, 1948
Girder bridge over Squaw Creek on 6th Street
Replaced by a new bridge

6th Street Culvert (Story County, Iowa)
Design
Concrete culvert bridge over College Creek Tributary on 6th Street
Open to traffic

7th Street Bridge (Shelby County, Iowa)
Built ca. 1920
Pony truss bridge over an unnamed creek on N. 7th Street in Harlan
Open to traffic

85th Street Bridge (Wapello County, Iowa)
Design, 1910
Steel stringer bridge over Honey Creek on 85th Street
Open to traffic

8th Avenue SW Bridge (Buchanan County, Iowa)
Design
Concrete culvert bridge over Small Stream on 8th Avenue SW
Open to traffic

8th Street Bridge (Story County, Iowa)
Built 1936
Steel stringer bridge over West Branch Indian Creek on 8th Street
Open to traffic

9th Avenue SW Bridge (Buchanan County, Iowa)
Design
Concrete culvert bridge over Small Stream on 9th Avenue SW
Open to traffic

9th Street Culvert (Sac County, Iowa)
Design
Concrete culvert bridge over Unnamed North Raccoon River Tributary on 9th Street
Open to traffic

Abandoned Lincoln Highway West Beaver Creek Bridge (Greene County, Iowa)
Built 1915
Concrete Slab bridge over West Beaver Creek on Lincoln Highway
Abandoned

Adair Viaduct (Adair County, Iowa)
Design, 1923
Three-span open-spandrel arch bridge over the IAIS Railroad on 5th Street (IA 925) in Adair
Open to traffic

Adams Parkway Bridge (Bremer County, Iowa)
Design, 1968
Haunched deck plate girder bridge over Cedar River on Adams Parkway
Open to traffic

Adelphi RFD 1 Bridge (Polk County, Iowa)
Lost Concrete deck girder bridge over Unnamed Tributary of the Des Moines River on Adelphi RFD 1
Replaced by a new bridge

Alburnett Road Bridge (Linn County, Iowa)
Built 1925
Lost concrete arch bridge over Indian Creek on Alburnett Road
Replaced by new bridge

Amana Road Bridge (Johnson County, Iowa)
Built 1940
Steel stringer bridge over Unnamed Stream on Fm Amana Road
Open to traffic

Anderson Canoe Access Bridge (Story County, Iowa)
Concrete Culvert over Small Drainage Creek on Road to Anderson Canoe Access
Open to traffic

Apple Creek Bridge (Linn County, Iowa)
Built 1935
Steel stringer bridge over Apple Creek on Washington Street
Open to traffic

Apple Road Bridge (Clayton County, Iowa)
Built 1949
Concrete arch bridge over an unnamed creek on Apple Road
Open to traffic

Atherton Trail Culvert (Johnson County, Iowa)
Abandoned concrete culvert bridge over Unamed Stream on Old Ely Road
Open to pedestrians only