US Bridges

US 61 NB Ia 92 EB over Dme RR

Fair

Louisa County, Iowa · 3.4 MI N of W JCT Ia 92 · Structure no. 000000000034031

Built
1977
48 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
180 ft
3 main spans
Daily traffic
3,350
2022 count
Owner
State
State Highway Agency

About this bridge

US 61 NB Ia 92 EB over Dme RR is a prestressed concrete stringer/multi-beam or girder carrying US 61 NB Ia 92 EB over Dme RR in Louisa County, Iowa. It was built in 1977, so it is 48 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 3,350 vehicles a day, roughly 18% of them trucks, projected to reach 3,350 by 2043. The structure is 180 ft (54.9 m) long and 47 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesUS 61 NB Ia 92 EB
CrossesDme RR
Location3.4 MI N of W JCT Ia 92
RouteU.S. Route 61
StateIowa
Coordinates41.32491, -91.20095
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
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 geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating78.9 US tons
Inventory rating40.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span65 ft (19.8 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,350 (2022)
Projected traffic3,350 by 2043
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed5 mi (8 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 NB Ia 92 EB over Dme RR built?

It was built in 1977, making it 48 years old in 2025.

What condition is US 61 NB Ia 92 EB over Dme 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 January 2023.

How much traffic does US 61 NB Ia 92 EB over Dme RR carry?

About 3,350 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is US 61 NB Ia 92 EB over Dme RR?

The structure is 180 ft (54.9 m) long with a longest span of 65 ft (19.8 m) and a deck 47 ft wide.

Who owns US 61 NB Ia 92 EB over Dme RR?

It is owned by the State Highway Agency.