US Bridges

Fourth ST over Small Stream

FairPosted for load

Benton County, Iowa · N60000500 · Structure no. 000000000011660

Built
1955
70 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Concrete
Length
31 ft
1 main span
Daily traffic
104
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Fourth ST over Small Stream is a concrete tee beam carrying Fourth ST over Small Stream in Benton County, Iowa. It was built in 1955, so it is 70 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. Its operating status is: posted for load restriction.

It carries about 104 vehicles a day, projected to reach 104 by 2043. The structure is 31 ft (9.4 m) long and 26 ft wide.

Location

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CarriesFourth ST
CrossesSmall Stream
LocationN60000500
RouteCity Street 0
CountyBenton County
StateIowa
Coordinates41.8734, -91.83573
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
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.5 US tons
Inventory rating17.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic104 (2021)
Projected traffic104 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Fourth ST over Small Stream built?

It was built in 1955, making it 70 years old in 2025.

What condition is Fourth ST over Small 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 February 2023.

How much traffic does Fourth ST over Small Stream carry?

About 104 vehicles per day (2021 count).

How long is Fourth ST over Small Stream?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 26 ft wide.

Who owns Fourth ST over Small Stream?

It is owned by the City or Municipal Highway Agency.