US Bridges

FM over Tributary to Troublesome

Fair

Guthrie County, Iowa · 079330502 · Structure no. 000000000168460

Built
1951
74 years old
Condition
Fair
inspected November 2022
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
199
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Tributary to Troublesome is a concrete slab carrying FM over Tributary to Troublesome in Guthrie County, Iowa. It was built in 1951, so it is 74 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 199 vehicles a day, roughly 29% of them trucks, projected to reach 199 by 2042. The structure is 27 ft (8.2 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFM
CrossesTributary to Troublesome
Location079330502
RouteCounty Highway 0
CountyGuthrie County
StateIowa
Coordinates41.68069, -94.72487
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2022
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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.3 US tons
Inventory rating35.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length27 ft (8.2 m)
Longest span24 ft (7.3 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic199 (2022)
Projected traffic199 by 2042
Trucks29%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Tributary to Troublesome built?

It was built in 1951, making it 74 years old in 2025.

What condition is FM over Tributary to Troublesome 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 November 2022.

How much traffic does FM over Tributary to Troublesome carry?

About 199 vehicles per day (2022 count), of which roughly 29% are trucks.

How long is FM over Tributary to Troublesome?

The structure is 27 ft (8.2 m) long with a longest span of 24 ft (7.3 m) and a deck 32 ft wide.

Who owns FM over Tributary to Troublesome?

It is owned by the County Highway Agency.