US Bridges

Ia 92 over Grand River

Fair

Adair County, Iowa · 1.0 Mi. W of Jct. SR P28 · Structure no. 000000000013060

Built
1966
59 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
168 ft
3 main spans
Daily traffic
1,780
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 92 over Grand River is a prestressed concrete stringer/multi-beam or girder carrying Ia 92 over Grand River in Adair County, Iowa. It was built in 1966, so it is 59 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 1,780 vehicles a day, roughly 13% of them trucks, projected to reach 1,780 by 2043. The structure is 168 ft (51.2 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
CrossesGrand River
Location1.0 Mi. W of Jct. SR P28
RouteState Highway 92
CountyAdair County
StateIowa
Coordinates41.30191, -94.32497
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating79.6 US tons
Inventory rating35.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length168 ft (51.2 m)
Longest span69 ft (21 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,780 (2022)
Projected traffic1,780 by 2043
Trucks13%
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 Grand River built?

It was built in 1966, making it 59 years old in 2025.

What condition is Ia 92 over Grand 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 February 2023.

How much traffic does Ia 92 over Grand River carry?

About 1,780 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Ia 92 over Grand River?

The structure is 168 ft (51.2 m) long with a longest span of 69 ft (21 m) and a deck 36 ft wide.

Who owns Ia 92 over Grand River?

It is owned by the State Highway Agency.