US Bridges

County Road over Branch Tarkio Creek

FairPosted for load

Montgomery County, Iowa · 071372005 · Structure no. 000000000254480

Built
1959
66 years old, rebuilt 2015
Condition
Fair
inspected May 2024
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

County Road over Branch Tarkio Creek is a concrete channel beam carrying County Road over Branch Tarkio Creek in Montgomery County, Iowa. It was built in 1959 and reconstructed in 2015, so it is 66 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. Its operating status is: posted for load restriction.

It carries about 11 vehicles a day, projected to reach 11 by 2044. The structure is 31 ft (9.4 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCounty Road
CrossesBranch Tarkio Creek
Location071372005
RouteCounty Highway 0
CountyMontgomery County
StateIowa
Coordinates40.93352, -95.12658
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38.4 US tons
Inventory rating23 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadH 15
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width27 ft (8.2 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2022)
Projected traffic11 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 County Road over Branch Tarkio Creek built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2015.

What condition is County Road over Branch Tarkio 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 May 2024.

How much traffic does County Road over Branch Tarkio Creek carry?

About 11 vehicles per day (2022 count).

How long is County Road over Branch Tarkio Creek?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 27 ft wide.

Who owns County Road over Branch Tarkio Creek?

It is owned by the County Highway Agency.