US Bridges

120th ST over Stream

Fair

Delaware County, Iowa · 090041301 · Structure no. 000000000142281

Built
1985
40 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
26 ft
1 main span
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

120th ST over Stream is a prestressed concrete tee beam carrying 120th ST over Stream in Delaware 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 26 vehicles a day, projected to reach 26 by 2044. The structure is 26 ft (7.9 m) long and 25 ft wide.

Location

Open in Google Maps
Carries120th ST
CrossesStream
Location090041301
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.61645, -91.25272
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating40 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span25 ft (7.6 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 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 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 120th ST over Stream built?

It was built in 1985, making it 40 years old in 2025.

What condition is 120th ST over Stream in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2024.

How much traffic does 120th ST over Stream carry?

About 26 vehicles per day (2022 count).

How long is 120th ST over Stream?

The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 25 ft wide.

Who owns 120th ST over Stream?

It is owned by the County Highway Agency.