US Bridges

FM over East Nishnabotna River

Good

Audubon County, Iowa · 079352701 · Structure no. 000000000067701

Built
1987
38 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
176 ft
3 main spans
Daily traffic
34
2021 count
Owner
County
County Highway Agency

About this bridge

FM over East Nishnabotna River is a prestressed concrete stringer/multi-beam or girder carrying FM over East Nishnabotna River in Audubon County, Iowa. It was built in 1987, so it is 38 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 34 vehicles a day, projected to reach 34 by 2043. The structure is 176 ft (53.6 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesFM
CrossesEast Nishnabotna River
Location079352701
RouteCounty Highway 0
StateIowa
Coordinates41.63053, -94.90488
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating61 US tons
Inventory rating37 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length176 ft (53.6 m)
Longest span65 ft (19.8 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (2021)
Projected traffic34 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over East Nishnabotna River built?

It was built in 1987, making it 38 years old in 2025.

What condition is FM 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 June 2023.

How much traffic does FM over East Nishnabotna River carry?

About 34 vehicles per day (2021 count).

How long is FM over East Nishnabotna River?

The structure is 176 ft (53.6 m) long with a longest span of 65 ft (19.8 m) and a deck 27 ft wide.

Who owns FM over East Nishnabotna River?

It is owned by the County Highway Agency.