US Bridges

340th over Stream

FairPosted for load

Worth County, Iowa · 098203602 · Structure no. 000000000355740

Built
1928
97 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
34 ft
1 main span
Daily traffic
47
2022 count
Owner
County
County Highway Agency

About this bridge

340th over Stream is a steel stringer/multi-beam or girder carrying 340th over Stream in Worth County, Iowa. It was built in 1928, so it is 97 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 47 vehicles a day, projected to reach 47 by 2043. The structure is 34 ft (10.4 m) long and 19 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries340th
CrossesStream
Location098203602
RouteCounty Highway 0
CountyWorth County
StateIowa
Coordinates43.25523, -93.16135
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating33.7 US tons
Inventory rating20.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length34 ft (10.4 m)
Longest span32 ft (9.8 m)
Deck width19 ft (5.9 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47 (2022)
Projected traffic47 by 2043
Trucks0%
Lanes on structure2
Traffic directionOne-lane bridge for two-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 statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 340th over Stream built?

It was built in 1928, making it 97 years old in 2025.

What condition is 340th over Stream 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 December 2023.

How much traffic does 340th over Stream carry?

About 47 vehicles per day (2022 count).

How long is 340th over Stream?

The structure is 34 ft (10.4 m) long with a longest span of 32 ft (9.8 m) and a deck 19 ft wide.

Who owns 340th over Stream?

It is owned by the County Highway Agency.