US Bridges

Ia 83 over East Nishnabotna River

Fair

Cass County, Iowa · 2.1 Mi. E of Jct. Ia 173 · Structure no. 000000000017800

Built
1934
91 years old, rebuilt 1982
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
215 ft
3 main spans
Daily traffic
3,690
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 83 over East Nishnabotna River is a steel continuous stringer/multi-beam or girder carrying Ia 83 over East Nishnabotna River in Cass County, Iowa. It was built in 1934 and reconstructed in 1982, so it is 91 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 3,690 vehicles a day, roughly 5% of them trucks, projected to reach 3,690 by 2044. The structure is 215 ft (65.5 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIa 83
CrossesEast Nishnabotna River
Location2.1 Mi. E of Jct. Ia 173
RouteState Highway 83
CountyCass County
StateIowa
Coordinates41.40913, -95.02919
Functional classUrban Other Principal 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating51.1 US tons
Inventory rating28.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length215 ft (65.5 m)
Longest span82 ft (25 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,690 (2022)
Projected traffic3,690 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 83 over East Nishnabotna River built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1982.

What condition is Ia 83 over East Nishnabotna 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 March 2024.

How much traffic does Ia 83 over East Nishnabotna River carry?

About 3,690 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Ia 83 over East Nishnabotna River?

The structure is 215 ft (65.5 m) long with a longest span of 82 ft (25 m) and a deck 26 ft wide.

Who owns Ia 83 over East Nishnabotna River?

It is owned by the State Highway Agency.