US Bridges

198th Street over I-35

Good

Decatur County, Iowa · 1.3 Mi. N of Jct. Ia 2 · Structure no. 000000000022970

Built
1969
56 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
310 ft
4 main spans
Daily traffic
60
2022 count
Owner
State
State Highway Agency

About this bridge

198th Street over I-35 is a steel continuous stringer/multi-beam or girder carrying 198th Street over I-35 in Decatur County, Iowa. It was built in 1969, so it is 56 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 60 vehicles a day, roughly 23% of them trucks, projected to reach 60 by 2044. The structure is 310 ft (94.5 m) long and 35 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Carries198th Street
CrossesI-35
Location1.3 Mi. N of Jct. Ia 2
RouteCounty Highway 0
StateIowa
Coordinates40.7573, -93.8376
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56.2 US tons
Inventory rating33.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length310 ft (94.5 m)
Longest span95 ft (29 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2022)
Projected traffic60 by 2044
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed14.9 mi (24 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 198th Street over I-35 built?

It was built in 1969, making it 56 years old in 2025.

What condition is 198th Street over I-35 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does 198th Street over I-35 carry?

About 60 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is 198th Street over I-35?

The structure is 310 ft (94.5 m) long with a longest span of 95 ft (29 m) and a deck 35 ft wide.

Who owns 198th Street over I-35?

It is owned by the State Highway Agency.