US Bridges

230th ST over US 20

Good

Sac County, Iowa · 1.4 Mi. W of Jct. SR M54 · Structure no. 000000000700075

Built
2012
13 years old
Condition
Good
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
323 ft
4 main spans
Daily traffic
20
2022 count
Owner
State
State Highway Agency

About this bridge

230th ST over US 20 is a prestressed concrete stringer/multi-beam or girder carrying 230th ST over US 20 in Sac 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 323 ft (98.5 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries230th ST
CrossesUS 20
Location1.4 Mi. W of Jct. SR M54
RouteCounty Highway 0
CountySac County
StateIowa
Coordinates42.4583, -95.02094
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.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length323 ft (98.5 m)
Longest span107 ft (32.5 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 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
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 230th ST over US 20 built?

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

What condition is 230th ST over US 20 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 January 2023.

How much traffic does 230th ST over US 20 carry?

About 20 vehicles per day (2022 count).

How long is 230th ST over US 20?

The structure is 323 ft (98.5 m) long with a longest span of 107 ft (32.5 m) and a deck 33 ft wide.

Who owns 230th ST over US 20?

It is owned by the State Highway Agency.