US Bridges

Ia 92 over Iowa River

Fair

Louisa County, Iowa · 0.5 Mi. E. of JCT Ia 70 · Structure no. 000000000034121

Built
1985
40 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,449 ft
15 main spans
Daily traffic
4,090
2023 count
Owner
State
State Highway Agency

About this bridge

Ia 92 over Iowa River is a prestressed concrete stringer/multi-beam or girder carrying Ia 92 over Iowa River in Louisa County, Iowa. It was built in 1985, so it is 40 years old, younger 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 4,090 vehicles a day, roughly 18% of them trucks, projected to reach 4,090 by 2043. The structure is 1,449 ft (441.7 m) long and 35 ft wide. If it were closed, the detour would be 52.2 mi (84 km).

Location

Open in Google Maps
CarriesIa 92
CrossesIowa River
Location0.5 Mi. E. of JCT Ia 70
RouteState Highway 92
CountyLouisa County
StateIowa
Coordinates41.27897, -91.34676
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99.8 US tons
Inventory rating41.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans15
Design loadHS 20
Structure length1,449 ft (441.7 m)
Longest span97 ft (29.6 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,090 (2023)
Projected traffic4,090 by 2043
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.2 mi (84 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 92 over Iowa River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Ia 92 over Iowa River 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 July 2024.

How much traffic does Ia 92 over Iowa River carry?

About 4,090 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is Ia 92 over Iowa River?

The structure is 1,449 ft (441.7 m) long with a longest span of 97 ft (29.6 m) and a deck 35 ft wide.

Who owns Ia 92 over Iowa River?

It is owned by the State Highway Agency.