US Bridges

US 61 SB over Ia 92

Good

Louisa County, Iowa · US 61 & Ia 92 Interchange · Structure no. 000000000700245

Built
2017
8 years old
Condition
Good
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
197 ft
3 main spans
Daily traffic
2,225
2022 count
Owner
State
State Highway Agency

About this bridge

US 61 SB over Ia 92 is a prestressed concrete stringer/multi-beam or girder carrying US 61 SB over Ia 92 in Louisa County, Iowa. It was built in 2017, so it is 8 years old, younger 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 2,225 vehicles a day, roughly 15% of them trucks, projected to reach 2,225 by 2043. The structure is 197 ft (60 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 61 SB
CrossesIa 92
LocationUS 61 & Ia 92 Interchange
RouteU.S. Route 61
StateIowa
Coordinates41.27681, -91.19961
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length197 ft (60 m)
Longest span92 ft (28 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,225 (2022)
Projected traffic2,225 by 2043
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 61 SB over Ia 92 built?

It was built in 2017, making it 8 years old in 2025.

What condition is US 61 SB over Ia 92 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 January 2023.

How much traffic does US 61 SB over Ia 92 carry?

About 2,225 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is US 61 SB over Ia 92?

The structure is 197 ft (60 m) long with a longest span of 92 ft (28 m) and a deck 43 ft wide.

Who owns US 61 SB over Ia 92?

It is owned by the State Highway Agency.