US Bridges

Ia 92 over Middle River

Fair

Madison County, Iowa · 2.0 Mi. W of SR P-53 · Structure no. 000000000034810

Built
1967
58 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
214 ft
3 main spans
Daily traffic
1,130
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 92 over Middle River is a steel continuous stringer/multi-beam or girder carrying Ia 92 over Middle River in Madison County, Iowa. It was built in 1967, so it is 58 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 1,130 vehicles a day, roughly 20% of them trucks, projected to reach 1,130 by 2042. The structure is 214 ft (65.2 m) long and 36 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesIa 92
CrossesMiddle River
Location2.0 Mi. W of SR P-53
RouteState Highway 92
CountyMadison County
StateIowa
Coordinates41.31687, -94.21387
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.2 US tons
Inventory rating27.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length214 ft (65.2 m)
Longest span82 ft (25 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,130 (2022)
Projected traffic1,130 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 92 over Middle River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Ia 92 over Middle 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 May 2023.

How much traffic does Ia 92 over Middle River carry?

About 1,130 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is Ia 92 over Middle River?

The structure is 214 ft (65.2 m) long with a longest span of 82 ft (25 m) and a deck 36 ft wide.

Who owns Ia 92 over Middle River?

It is owned by the State Highway Agency.