US Bridges

US 6 over Iais RR

Fair

Jasper County, Iowa · 1.5 Mi. E of Jct. Ia 224 · Structure no. 000000000030500

Built
1952
73 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
189 ft
3 main spans
Daily traffic
2,180
2022 count
Owner
State
State Highway Agency

About this bridge

US 6 over Iais RR is a steel continuous stringer/multi-beam or girder carrying US 6 over Iais RR in Jasper County, Iowa. It was built in 1952, so it is 73 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 5 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 2,180 vehicles a day, roughly 7% of them trucks, projected to reach 2,180 by 2042. The structure is 189 ft (57.6 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesUS 6
CrossesIais RR
Location1.5 Mi. E of Jct. Ia 224
RouteU.S. Route 6
CountyJasper County
StateIowa
Coordinates41.70367, -92.87688
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating43.7 US tons
Inventory rating26.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length189 ft (57.6 m)
Longest span72 ft (21.9 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,180 (2022)
Projected traffic2,180 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed6.2 mi (10 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 US 6 over Iais RR built?

It was built in 1952, making it 73 years old in 2025.

What condition is US 6 over Iais RR 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 April 2024.

How much traffic does US 6 over Iais RR carry?

About 2,180 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is US 6 over Iais RR?

The structure is 189 ft (57.6 m) long with a longest span of 72 ft (21.9 m) and a deck 34 ft wide.

Who owns US 6 over Iais RR?

It is owned by the State Highway Agency.