US Bridges

FM over Troy Creek

Good

Jefferson County, Iowa · 071091503 · Structure no. 000000000200061

Built
2004
21 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
93 ft
1 main span
Daily traffic
690
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Troy Creek is a prestressed concrete stringer/multi-beam or girder carrying FM over Troy Creek in Jefferson County, Iowa. It was built in 2004, so it is 21 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 690 vehicles a day, roughly 8% of them trucks, projected to reach 690 by 2043. The structure is 93 ft (28.3 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesFM
CrossesTroy Creek
Location071091503
RouteCounty Highway 0
StateIowa
Coordinates40.95651, -91.88378
Functional classRural Major Collector

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.1 US tons
Inventory rating45 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length93 ft (28.3 m)
Longest span90 ft (27.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic690 (2022)
Projected traffic690 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Troy Creek built?

It was built in 2004, making it 21 years old in 2025.

What condition is FM over Troy 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 Troy Creek carry?

About 690 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is FM over Troy Creek?

The structure is 93 ft (28.3 m) long with a longest span of 90 ft (27.4 m) and a deck 32 ft wide.

Who owns FM over Troy Creek?

It is owned by the County Highway Agency.