US Bridges

120th ST over Small Stream

Good

Butler County, Iowa · 670 East of Ridge Ave. · Structure no. 000000000366790

Built
2022
3 years old
Condition
Good
inspected April 2024
Type
Slab
Steel
Length
30 ft
1 main span
Daily traffic
35
2022 count
Owner
County
County Highway Agency

About this bridge

120th ST over Small Stream is a steel slab carrying 120th ST over Small Stream in Butler County, Iowa. It was built in 2022, so it is 3 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 35 vehicles a day, projected to reach 35 by 2044. The structure is 30 ft (9.2 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries120th ST
CrossesSmall Stream
Location670 East of Ridge Ave.
RouteCounty Highway 0
CountyButler County
StateIowa
Coordinates42.87657, -92.69029
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 protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating50 US tons

Structure

Structure typeSlab
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.2 m)
Longest span28 ft (8.4 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2022)
Projected traffic35 by 2044
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 120th ST over Small Stream built?

It was built in 2022, making it 3 years old in 2025.

What condition is 120th ST over Small Stream 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 April 2024.

How much traffic does 120th ST over Small Stream carry?

About 35 vehicles per day (2022 count).

How long is 120th ST over Small Stream?

The structure is 30 ft (9.2 m) long with a longest span of 28 ft (8.4 m) and a deck 30 ft wide.

Who owns 120th ST over Small Stream?

It is owned by the County Highway Agency.