US Bridges

FM over Big Creek

Good

Henry County, Iowa · 071061708 · Structure no. 000000000180416

Built
1999
26 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
176 ft
3 main spans
Daily traffic
940
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Big Creek is a prestressed concrete stringer/multi-beam or girder carrying FM over Big Creek in Henry County, Iowa. It was built in 1999, so it is 26 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 940 vehicles a day, roughly 9% of them trucks, projected to reach 940 by 2043. The structure is 176 ft (53.6 m) long and 32 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesFM
CrossesBig Creek
Location071061708
RouteCounty Highway 0
StateIowa
Coordinates40.94589, -91.57069
Functional classUrban Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 48 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 alignment8: Equal to present desirable criteria
Operating rating78.2 US tons
Inventory rating46.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length176 ft (53.6 m)
Longest span63 ft (19.2 m)
Deck width32 ft (9.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic940 (2022)
Projected traffic940 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Big Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is FM over Big Creek 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 February 2023.

How much traffic does FM over Big Creek carry?

About 940 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is FM over Big Creek?

The structure is 176 ft (53.6 m) long with a longest span of 63 ft (19.2 m) and a deck 32 ft wide.

Who owns FM over Big Creek?

It is owned by the County Highway Agency.