US Bridges

Local over E Nishnabotna River

FairPosted for load

Audubon County, Iowa · 079350201 · Structure no. 000000000067550

Built
1924
101 years old
Condition
Fair
inspected June 2023
Type
Truss - Thru
Steel
Length
123 ft
1 main span
Daily traffic
15
2021 count
Owner
County
County Highway Agency

About this bridge

Local over E Nishnabotna River is a steel truss - thru carrying Local over E Nishnabotna River in Audubon County, Iowa. It was built in 1924, so it is 101 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. Its operating status is: posted for load restriction.

It carries about 15 vehicles a day, roughly 20% of them trucks, projected to reach 15 by 2043. The structure is 123 ft (37.5 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesLocal
CrossesE Nishnabotna River
Location079350201
RouteCounty Highway 0
CountyAudubon County
StateIowa
Coordinates41.6814, -94.88791
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating20.2 US tons
Inventory rating14.3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadUnknown
Structure length123 ft (37.5 m)
Longest span80 ft (24.4 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2021)
Projected traffic15 by 2043
Trucks20%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Local over E Nishnabotna River built?

It was built in 1924, making it 101 years old in 2025.

What condition is Local over E 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 June 2023.

How much traffic does Local over E Nishnabotna River carry?

About 15 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is Local over E Nishnabotna River?

The structure is 123 ft (37.5 m) long with a longest span of 80 ft (24.4 m) and a deck 16 ft wide.

Who owns Local over E Nishnabotna River?

It is owned by the County Highway Agency.