US Bridges

230th St. over Silver Creek

Fair

Jones County, Iowa · 086041501 · Structure no. 000000000209221

Built
1971
54 years old
Condition
Fair
inspected March 2023
Type
Channel Beam
Concrete
Length
81 ft
3 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

230th St. over Silver Creek is a concrete channel beam carrying 230th St. over Silver Creek in Jones County, Iowa. It was built in 1971, so it is 54 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 20 vehicles a day, projected to reach 20 by 2043. The structure is 81 ft (24.7 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries230th St.
CrossesSilver Creek
Location086041501
RouteCounty Highway 0
CountyJones County
StateIowa
Coordinates42.26725, -91.30227
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.1 US tons
Inventory rating23.9 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 20
Structure length81 ft (24.7 m)
Longest span31 ft (9.4 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2043
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 230th St. over Silver Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is 230th St. over Silver 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 March 2023.

How much traffic does 230th St. over Silver Creek carry?

About 20 vehicles per day (2022 count).

How long is 230th St. over Silver Creek?

The structure is 81 ft (24.7 m) long with a longest span of 31 ft (9.4 m) and a deck 26 ft wide.

Who owns 230th St. over Silver Creek?

It is owned by the County Highway Agency.