US Bridges

Union Avenue over Stream

Fair

Adams County, Iowa · 071320304 · Structure no. 000000000058611

Built
1974
51 years old
Condition
Fair
inspected January 2024
Type
Tee Beam
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

Union Avenue over Stream is a prestressed concrete tee beam carrying Union Avenue over Stream in Adams County, Iowa. It was built in 1974, so it is 51 years old, older 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 5 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 20 vehicles a day, projected to reach 20 by 2044. The structure is 24 ft (7.3 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUnion Avenue
CrossesStream
Location071320304
RouteCounty Highway 0
CountyAdams County
StateIowa
Coordinates40.9725, -94.52773
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width25 ft (7.7 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$317,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Union Avenue over Stream built?

It was built in 1974, making it 51 years old in 2025.

What condition is Union Avenue 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 January 2024.

How much traffic does Union Avenue over Stream carry?

About 20 vehicles per day (2022 count).

How long is Union Avenue over Stream?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 25 ft wide.

Who owns Union Avenue over Stream?

It is owned by the County Highway Agency.