US Bridges

120th St. over Small Stream

Good

Butler County, Iowa · 093171601 · Structure no. 000000000089701

Built
1985
40 years old
Condition
Good
inspected April 2024
Type
Tee Beam
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
30
2022 count
Owner
County
County Highway Agency

About this bridge

120th St. over Small Stream is a prestressed concrete tee beam carrying 120th St. over Small Stream in Butler County, Iowa. It was built in 1985, so it is 40 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 30 vehicles a day, projected to reach 30 by 2044. The structure is 31 ft (9.4 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries120th St.
CrossesSmall Stream
Location093171601
RouteCounty Highway 0
CountyButler County
StateIowa
Coordinates42.87663, -92.86551
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating62.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2022)
Projected traffic30 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$170,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 120th St. over Small Stream built?

It was built in 1985, making it 40 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 30 vehicles per day (2022 count).

How long is 120th St. over Small Stream?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 24 ft wide.

Who owns 120th St. over Small Stream?

It is owned by the County Highway Agency.