US Bridges

NB I-35 over SR C-13

Fair

Franklin County, Iowa · At Jct. SR C-13 · Structure no. 000000000602500

Built
1972
53 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
138 ft
3 main spans
Daily traffic
8,350
2022 count
Owner
State
State Highway Agency

About this bridge

NB I-35 over SR C-13 is a prestressed concrete stringer/multi-beam or girder carrying NB I-35 over SR C-13 in Franklin County, Iowa. It was built in 1972, so it is 53 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 8,350 vehicles a day, roughly 30% of them trucks, projected to reach 8,350 by 2044. The structure is 138 ft (42.1 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB I-35
CrossesSR C-13
LocationAt Jct. SR C-13
RouteInterstate 35
CountyFranklin County
StateIowa
Coordinates42.89132, -93.35055
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating94.9 US tons
Inventory rating42.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length138 ft (42.1 m)
Longest span65 ft (19.8 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,350 (2022)
Projected traffic8,350 by 2044
Trucks30%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB I-35 over SR C-13 built?

It was built in 1972, making it 53 years old in 2025.

What condition is NB I-35 over SR C-13 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

How much traffic does NB I-35 over SR C-13 carry?

About 8,350 vehicles per day (2022 count), of which roughly 30% are trucks.

How long is NB I-35 over SR C-13?

The structure is 138 ft (42.1 m) long with a longest span of 65 ft (19.8 m) and a deck 43 ft wide.

Who owns NB I-35 over SR C-13?

It is owned by the State Highway Agency.