US Bridges

Ia 92 over Des Moines River

Fair

Marion County, Iowa · 0.5 Mi. E of Jct. SR T25 · Structure no. 000000000602650

Built
1978
47 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
572 ft
6 main spans
Daily traffic
3,240
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 92 over Des Moines River is a prestressed concrete stringer/multi-beam or girder carrying Ia 92 over Des Moines River in Marion County, Iowa. It was built in 1978, so it is 47 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 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 3,240 vehicles a day, roughly 18% of them trucks, projected to reach 3,240 by 2043. The structure is 572 ft (174.3 m) long and 47 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesIa 92
CrossesDes Moines River
Location0.5 Mi. E of Jct. SR T25
RouteState Highway 92
CountyMarion County
StateIowa
Coordinates41.30877, -92.87634
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating62.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length572 ft (174.3 m)
Longest span97 ft (29.6 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,240 (2022)
Projected traffic3,240 by 2043
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Des Moines River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Ia 92 over Des Moines 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 September 2023.

How much traffic does Ia 92 over Des Moines River carry?

About 3,240 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is Ia 92 over Des Moines River?

The structure is 572 ft (174.3 m) long with a longest span of 97 ft (29.6 m) and a deck 47 ft wide.

Who owns Ia 92 over Des Moines River?

It is owned by the State Highway Agency.