US Bridges

Ia 92 over Middle River

Good

Warren County, Iowa · 0.3 Mile East of Ia 28 · Structure no. 000000000051111

Built
1982
43 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
261 ft
3 main spans
Daily traffic
4,160
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 92 over Middle River is a prestressed concrete stringer/multi-beam or girder carrying Ia 92 over Middle River in Warren County, Iowa. It was built in 1982, so it is 43 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 4,160 vehicles a day, roughly 9% of them trucks, projected to reach 4,160 by 2043. The structure is 261 ft (79.6 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesIa 92
CrossesMiddle River
Location0.3 Mile East of Ia 28
RouteState Highway 92
StateIowa
Coordinates41.36857, -93.7357
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.3 US tons
Inventory rating33 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length261 ft (79.6 m)
Longest span96 ft (29.3 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,160 (2022)
Projected traffic4,160 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Middle River built?

It was built in 1982, making it 43 years old in 2025.

What condition is Ia 92 over Middle River 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 July 2023.

How much traffic does Ia 92 over Middle River carry?

About 4,160 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Ia 92 over Middle River?

The structure is 261 ft (79.6 m) long with a longest span of 96 ft (29.3 m) and a deck 43 ft wide.

Who owns Ia 92 over Middle River?

It is owned by the State Highway Agency.