US Bridges

4th ST over Shellrock River

Fair

Worth County, Iowa · 000000000 · Structure no. 000000000008811

Built
1986
39 years old
Condition
Fair
inspected December 2023
Type
Slab
Concrete Continuous
Length
153 ft
4 main spans
Daily traffic
480
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

4th ST over Shellrock River is a concrete continuous slab carrying 4th ST over Shellrock River in Worth County, Iowa. It was built in 1986, so it is 39 years old, younger 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.

It carries about 480 vehicles a day, projected to reach 480 by 2043. The structure is 153 ft (46.6 m) long and 39 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries4th ST
CrossesShellrock River
Location000000000
RouteCity Street 0
CountyWorth County
StateIowa
Coordinates43.4429, -93.22598
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.4 US tons
Inventory rating42.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length153 ft (46.6 m)
Longest span47 ft (14.3 m)
Deck width39 ft (11.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic480 (2022)
Projected traffic480 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 4th ST over Shellrock River built?

It was built in 1986, making it 39 years old in 2025.

What condition is 4th ST over Shellrock River 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 4th ST over Shellrock River carry?

About 480 vehicles per day (2022 count).

How long is 4th ST over Shellrock River?

The structure is 153 ft (46.6 m) long with a longest span of 47 ft (14.3 m) and a deck 39 ft wide.

Who owns 4th ST over Shellrock River?

It is owned by the City or Municipal Highway Agency and maintained by the Town or Township Highway Agency.