US Bridges

230th Street over Boylan Creek

Good

Franklin County, Iowa · 093192401 · Structure no. 000000000158171

Built
1984
41 years old
Condition
Good
inspected June 2024
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
5
2022 count
Owner
County
County Highway Agency

About this bridge

230th Street over Boylan Creek is a concrete continuous culvert carrying 230th Street over Boylan Creek in Franklin County, Iowa. It was built in 1984, so it is 41 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 5 vehicles a day, projected to reach 5 by 2044. The structure is 26 ft (7.8 m) long and 41 ft wide.

Carries230th Street
CrossesBoylan Creek
Location093192401
RouteCounty Highway 0
StateIowa
Coordinates42.86213, -93.03178
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating76.7 US tons
Inventory rating45.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length26 ft (7.8 m)
Longest span12 ft (3.8 m)
Deck width41 ft (12.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2022)
Projected traffic5 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Street over Boylan Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is 230th Street over Boylan 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 June 2024.

How much traffic does 230th Street over Boylan Creek carry?

About 5 vehicles per day (2022 count).

How long is 230th Street over Boylan Creek?

The structure is 26 ft (7.8 m) long with a longest span of 12 ft (3.8 m) and a deck 41 ft wide.

Who owns 230th Street over Boylan Creek?

It is owned by the County Highway Agency.