US Bridges

Ia 92 over East Nishnabotna River

Good

Pottawattamie County, Iowa · 1.4 Mi. W of Jct. Ia 48 · Structure no. 000000000043931

Built
1999
26 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
408 ft
4 main spans
Daily traffic
1,180
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 92 over East Nishnabotna River is a prestressed concrete stringer/multi-beam or girder carrying Ia 92 over East Nishnabotna River in Pottawattamie County, Iowa. It was built in 1999, so it is 26 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 1,180 vehicles a day, roughly 19% of them trucks, projected to reach 1,180 by 2043. The structure is 408 ft (124.4 m) long and 47 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesIa 92
CrossesEast Nishnabotna River
Location1.4 Mi. W of Jct. Ia 48
RouteState Highway 92
StateIowa
Coordinates41.23483, -95.16346
Functional classRural Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
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 evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.8 US tons
Inventory rating54.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length408 ft (124.4 m)
Longest span112 ft (34.1 m)
Deck width47 ft (14.2 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,180 (2022)
Projected traffic1,180 by 2043
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 East Nishnabotna River built?

It was built in 1999, making it 26 years old in 2025.

What condition is Ia 92 over East Nishnabotna 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 East Nishnabotna River carry?

About 1,180 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is Ia 92 over East Nishnabotna River?

The structure is 408 ft (124.4 m) long with a longest span of 112 ft (34.1 m) and a deck 47 ft wide.

Who owns Ia 92 over East Nishnabotna River?

It is owned by the State Highway Agency.