US Bridges

FM over Rock Creek

Fair

Floyd County, Iowa · 097172402 · Structure no. 000000000156001

Built
1996
29 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
123 ft
2 main spans
Daily traffic
1,365
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Rock Creek is a prestressed concrete stringer/multi-beam or girder carrying FM over Rock Creek in Floyd County, Iowa. It was built in 1996, so it is 29 years old, younger 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 6 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 1,365 vehicles a day, roughly 17% of them trucks, projected to reach 1,365 by 2043. The structure is 123 ft (37.5 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesFM
CrossesRock Creek
Location097172402
RouteCounty Highway 0
CountyFloyd County
StateIowa
Coordinates43.21024, -92.81042
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum 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 alignment7: Better than present minimum criteria
Operating rating67.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length123 ft (37.5 m)
Longest span60 ft (18.3 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,365 (2022)
Projected traffic1,365 by 2043
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Rock Creek built?

It was built in 1996, making it 29 years old in 2025.

What condition is FM over Rock 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 March 2023.

How much traffic does FM over Rock Creek carry?

About 1,365 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is FM over Rock Creek?

The structure is 123 ft (37.5 m) long with a longest span of 60 ft (18.3 m) and a deck 33 ft wide.

Who owns FM over Rock Creek?

It is owned by the County Highway Agency.