US Bridges

320th ST over Creek

Good

Mitchell County, Iowa · 1/8 Mi. W. of Balsam Ave. · Structure no. 000000000247651

Built
2020
5 years old
Condition
Good
inspected January 2024
Type
Culvert
Concrete
Length
40 ft
3 main spans
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

320th ST over Creek is a concrete culvert carrying 320th ST over Creek in Mitchell County, Iowa. It was built in 2020, so it is 5 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 26 vehicles a day, projected to reach 26 by 2044. The structure is 40 ft (12.3 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries320th ST
CrossesCreek
Location1/8 Mi. W. of Balsam Ave.
RouteCounty Highway 0
CountyMitchell County
StateIowa
Coordinates43.22732, -93.0071
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 protection9 ExcellentNo problems noted.
Culvert9 ExcellentNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation9: Superior to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.4 US tons
Inventory rating50.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHL 93
Structure length40 ft (12.3 m)
Longest span12 ft (3.7 m)
Deck width36 ft (11 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 320th ST over Creek built?

It was built in 2020, making it 5 years old in 2025.

What condition is 320th ST over 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 January 2024.

How much traffic does 320th ST over Creek carry?

About 26 vehicles per day (2022 count).

How long is 320th ST over Creek?

The structure is 40 ft (12.3 m) long with a longest span of 12 ft (3.7 m) and a deck 36 ft wide.

Who owns 320th ST over Creek?

It is owned by the County Highway Agency.