US Bridges

FM over South Big Creek

Fair

Henry County, Iowa · 072053601 · Structure no. 000000000180880

Built
1967
58 years old
Condition
Fair
inspected February 2023
Type
Culvert
Concrete Continuous
Length
45 ft
2 main spans
Daily traffic
900
2022 count
Owner
County
County Highway Agency

About this bridge

FM over South Big Creek is a concrete continuous culvert carrying FM over South Big Creek in Henry County, Iowa. It was built in 1967, so it is 58 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 900 vehicles a day, roughly 23% of them trucks, projected to reach 900 by 2043. The structure is 45 ft (13.7 m) long and 38 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesFM
CrossesSouth Big Creek
Location072053601
RouteCounty Highway 0
StateIowa
Coordinates41.0015, -91.38628
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 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 geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length45 ft (13.7 m)
Longest span21 ft (6.4 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic900 (2022)
Projected traffic900 by 2043
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 FM over South Big Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is FM over South Big Creek 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 February 2023.

How much traffic does FM over South Big Creek carry?

About 900 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is FM over South Big Creek?

The structure is 45 ft (13.7 m) long with a longest span of 21 ft (6.4 m) and a deck 38 ft wide.

Who owns FM over South Big Creek?

It is owned by the County Highway Agency.