US Bridges

FM S-25 over I 35

Fair

Franklin County, Iowa · 2.2 Mi. N of Jct. Iowa 3 · Structure no. 000000000602440

Built
1973
52 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
771 ft
4 main spans
Daily traffic
559
2022 count
Owner
State
State Highway Agency

About this bridge

FM S-25 over I 35 is a steel continuous stringer/multi-beam or girder carrying FM S-25 over I 35 in Franklin County, Iowa. It was built in 1973, so it is 52 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 559 vehicles a day, roughly 19% of them trucks, projected to reach 559 by 2042. The structure is 771 ft (235 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesFM S-25
CrossesI 35
Location2.2 Mi. N of Jct. Iowa 3
RouteCity Street 0
StateIowa
Coordinates42.77346, -93.37996
Functional classRural Major Collector

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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating65 US tons
Inventory rating39.1 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length771 ft (235 m)
Longest span242 ft (73.8 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic559 (2022)
Projected traffic559 by 2042
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 FM S-25 over I 35 built?

It was built in 1973, making it 52 years old in 2025.

What condition is FM S-25 over I 35 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 May 2023.

How much traffic does FM S-25 over I 35 carry?

About 559 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is FM S-25 over I 35?

The structure is 771 ft (235 m) long with a longest span of 242 ft (73.8 m) and a deck 35 ft wide.

Who owns FM S-25 over I 35?

It is owned by the State Highway Agency.