US Bridges

120th ST over Stream

PoorPosted for load

Butler County, Iowa · 093161401 · Structure no. 000000000089391

Built
1981
44 years old
Condition
Poor
inspected April 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
126 ft
7 main spans
Daily traffic
48
2021 count
Owner
County
County Highway Agency

About this bridge

120th ST over Stream is a wood or timber stringer/multi-beam or girder carrying 120th ST over Stream in Butler County, Iowa. It was built in 1981, so it is 44 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 48 vehicles a day, projected to reach 48 by 2044. The structure is 126 ft (38.4 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries120th ST
CrossesStream
Location093161401
RouteCounty Highway 0
StateIowa
Coordinates42.87651, -92.69703
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating19.4 US tons
Inventory rating15.1 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans7
Design loadUnknown
Structure length126 ft (38.4 m)
Longest span19 ft (5.8 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic48 (2021)
Projected traffic48 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.5 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 120th ST over Stream built?

It was built in 1981, making it 44 years old in 2025.

What condition is 120th ST over Stream in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2024.

How much traffic does 120th ST over Stream carry?

About 48 vehicles per day (2021 count).

How long is 120th ST over Stream?

The structure is 126 ft (38.4 m) long with a longest span of 19 ft (5.8 m) and a deck 24 ft wide.

Who owns 120th ST over Stream?

It is owned by the County Highway Agency.