US Bridges

FM over East Br W Nishnabotna

Fair

Shelby County, Iowa · 078380703 · Structure no. 000000000304230

Built
1965
60 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
252 ft
3 main spans
Daily traffic
278
2022 count
Owner
County
County Highway Agency

About this bridge

FM over East Br W Nishnabotna is a steel continuous stringer/multi-beam or girder carrying FM over East Br W Nishnabotna in Shelby County, Iowa. It was built in 1965, so it is 60 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 278 vehicles a day, roughly 23% of them trucks, projected to reach 278 by 2043. The structure is 252 ft (76.8 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFM
CrossesEast Br W Nishnabotna
Location078380703
RouteCounty Highway 0
CountyShelby County
StateIowa
Coordinates41.57823, -95.25627
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length252 ft (76.8 m)
Longest span98 ft (29.9 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic278 (2022)
Projected traffic278 by 2043
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over East Br W Nishnabotna built?

It was built in 1965, making it 60 years old in 2025.

What condition is FM over East Br W Nishnabotna 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 April 2023.

How much traffic does FM over East Br W Nishnabotna carry?

About 278 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is FM over East Br W Nishnabotna?

The structure is 252 ft (76.8 m) long with a longest span of 98 ft (29.9 m) and a deck 30 ft wide.

Who owns FM over East Br W Nishnabotna?

It is owned by the County Highway Agency.