US Bridges

Local over E Nishnabotna River

Fair

Audubon County, Iowa · 081341901 · Structure no. 000000000069215

Built
1971
54 years old
Condition
Fair
inspected July 2023
Type
Truss - Thru
Steel
Length
97 ft
1 main span
Daily traffic
5
2022 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 1971, so it is 54 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 6 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 5 vehicles a day, roughly 20% of them trucks, projected to reach 5 by 2043. The structure is 97 ft (29.6 m) long and 21 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLocal
CrossesE Nishnabotna River
Location081341901
RouteCounty Highway 0
CountyAudubon County
StateIowa
Coordinates41.82014, -94.84628
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.6 US tons
Inventory rating27.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length97 ft (29.6 m)
Longest span97 ft (29.6 m)
Deck width21 ft (6.3 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2022)
Projected traffic5 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$750 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Local over E Nishnabotna River built?

It was built in 1971, making it 54 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 July 2023.

How much traffic does Local over E Nishnabotna River carry?

About 5 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is Local over E Nishnabotna River?

The structure is 97 ft (29.6 m) long with a longest span of 97 ft (29.6 m) and a deck 21 ft wide.

Who owns Local over E Nishnabotna River?

It is owned by the County Highway Agency.