US Bridges

FM over West Nishnabotna River

Good

Carroll County, Iowa · 082 36 20 04 · Structure no. 000000000093881

Built
2010
15 years old
Condition
Good
inspected October 2022
Type
Slab
Concrete Continuous
Length
154 ft
3 main spans
Daily traffic
1,693
2022 count
Owner
County
County Highway Agency

About this bridge

FM over West Nishnabotna River is a concrete continuous slab carrying FM over West Nishnabotna River in Carroll County, Iowa. It was built in 2010, so it is 15 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,693 vehicles a day, roughly 6% of them trucks, projected to reach 1,693 by 2043. The structure is 154 ft (46.8 m) long and 33 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesFM
CrossesWest Nishnabotna River
Location082 36 20 04
RouteCounty Highway 0
StateIowa
Coordinates41.90104, -95.07336
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating60 US tons
Inventory rating46.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length154 ft (46.8 m)
Longest span59 ft (18 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,693 (2022)
Projected traffic1,693 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over West Nishnabotna River built?

It was built in 2010, making it 15 years old in 2025.

What condition is FM over West 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 October 2022.

How much traffic does FM over West Nishnabotna River carry?

About 1,693 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is FM over West Nishnabotna River?

The structure is 154 ft (46.8 m) long with a longest span of 59 ft (18 m) and a deck 33 ft wide.

Who owns FM over West Nishnabotna River?

It is owned by the County Highway Agency.