US Bridges

230th ST over Seven Mile Creek

Good

Union County, Iowa · 071281203 · Structure no. 000000000324331

Built
2012
13 years old
Condition
Good
inspected October 2023
Type
Slab
Steel Continuous
Length
64 ft
2 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

230th ST over Seven Mile Creek is a steel continuous slab carrying 230th ST over Seven Mile Creek in Union County, Iowa. It was built in 2012, so it is 13 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 20 vehicles a day, projected to reach 20 by 2043. The structure is 64 ft (19.5 m) long and 25 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries230th ST
CrossesSeven Mile Creek
Location071281203
RouteCounty Highway 0
StateIowa
Coordinates40.96854, -94.02491
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating47.1 US tons
Inventory rating28.2 US tons

Structure

Structure typeSlab
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span31 ft (9.4 m)
Deck width25 ft (7.6 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 230th ST over Seven Mile Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is 230th ST over Seven Mile Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does 230th ST over Seven Mile Creek carry?

About 20 vehicles per day (2022 count).

How long is 230th ST over Seven Mile Creek?

The structure is 64 ft (19.5 m) long with a longest span of 31 ft (9.4 m) and a deck 25 ft wide.

Who owns 230th ST over Seven Mile Creek?

It is owned by the County Highway Agency.