US Bridges

230th ST over Rock Creek

Good

Cedar County, Iowa · 080011103 · Structure no. 000000000102462

Built
2006
19 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
95 ft
1 main span
Daily traffic
71
2022 count
Owner
County
County Highway Agency

About this bridge

230th ST over Rock Creek is a prestressed concrete stringer/multi-beam or girder carrying 230th ST over Rock Creek in Cedar County, Iowa. It was built in 2006, so it is 19 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 71 vehicles a day, roughly 13% of them trucks, projected to reach 71 by 2044. The structure is 95 ft (29 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries230th ST
CrossesRock Creek
Location080011103
RouteCounty Highway 0
StateIowa
Coordinates41.75692, -90.93155
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.2 US tons
Inventory rating46.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length95 ft (29 m)
Longest span95 ft (29 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2022)
Projected traffic71 by 2044
Trucks13%
Lanes on structure2
Traffic directionTwo-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 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 Rock Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is 230th ST over Rock 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 May 2024.

How much traffic does 230th ST over Rock Creek carry?

About 71 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is 230th ST over Rock Creek?

The structure is 95 ft (29 m) long with a longest span of 95 ft (29 m) and a deck 33 ft wide.

Who owns 230th ST over Rock Creek?

It is owned by the County Highway Agency.