US Bridges

FM over Tarkio Creek Trib

Fair

Montgomery County, Iowa · 073372603 · Structure no. 000000000256370

Built
1970
55 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Tarkio Creek Trib is a prestressed concrete tee beam carrying FM over Tarkio Creek Trib in Montgomery County, Iowa. It was built in 1970, so it is 55 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 26 vehicles a day, projected to reach 26 by 2044. The structure is 34 ft (10.4 m) long and 25 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFM
CrossesTarkio Creek Trib
Location073372603
RouteCounty Highway 0
CountyMontgomery County
StateIowa
Coordinates41.10169, -95.0697
Functional classRural Minor 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating63.4 US tons
Inventory rating37.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadH 15
Structure length34 ft (10.4 m)
Longest span33 ft (10.1 m)
Deck width25 ft (7.6 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Tarkio Creek Trib built?

It was built in 1970, making it 55 years old in 2025.

What condition is FM over Tarkio Creek Trib 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 June 2024.

How much traffic does FM over Tarkio Creek Trib carry?

About 26 vehicles per day (2022 count).

How long is FM over Tarkio Creek Trib?

The structure is 34 ft (10.4 m) long with a longest span of 33 ft (10.1 m) and a deck 25 ft wide.

Who owns FM over Tarkio Creek Trib?

It is owned by the County Highway Agency.