US Bridges

FM over Mill Creek

Fair

O'Brien County, Iowa · 094413402 · Structure no. 000000000259301

Built
1979
46 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
152 ft
2 main spans
Daily traffic
538
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Mill Creek is a prestressed concrete stringer/multi-beam or girder carrying FM over Mill Creek in O'Brien County, Iowa. It was built in 1979, so it is 46 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 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 538 vehicles a day, roughly 25% of them trucks, projected to reach 538 by 2043. The structure is 152 ft (46.3 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesFM
CrossesMill Creek
Location094413402
RouteCounty Highway 0
StateIowa
Coordinates42.91379, -95.68245
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 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 rating97.9 US tons
Inventory rating42.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length152 ft (46.3 m)
Longest span84 ft (25.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic538 (2022)
Projected traffic538 by 2043
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$60,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Mill Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is FM over Mill 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 July 2023.

How much traffic does FM over Mill Creek carry?

About 538 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is FM over Mill Creek?

The structure is 152 ft (46.3 m) long with a longest span of 84 ft (25.6 m) and a deck 32 ft wide.

Who owns FM over Mill Creek?

It is owned by the County Highway Agency.