US Bridges

W 12th ST over Trib to Beaver Creek

Fair

Black Hawk County, Iowa · 89-14-18-01-10 · Structure no. 000000000075890

Built
1939
86 years old, rebuilt 1986
Condition
Fair
inspected December 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
59 ft
3 main spans
Daily traffic
34
2022 count
Owner
County
County Highway Agency

About this bridge

W 12th ST over Trib to Beaver Creek is a steel stringer/multi-beam or girder carrying W 12th ST over Trib to Beaver Creek in Black Hawk County, Iowa. It was built in 1939 and reconstructed in 1986, so it is 86 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 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 34 vehicles a day, projected to reach 34 by 2043. The structure is 59 ft (18 m) long and 23 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesW 12th ST
CrossesTrib to Beaver Creek
Location89-14-18-01-10
RouteCounty Highway 0
CountyBlack Hawk County
StateIowa
Coordinates42.52783, -92.54514
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment7: Better than present minimum criteria
Operating rating46.3 US tons
Inventory rating27.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length59 ft (18 m)
Longest span20 ft (6.1 m)
Deck width23 ft (6.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (2022)
Projected traffic34 by 2043
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was W 12th ST over Trib to Beaver Creek built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1986.

What condition is W 12th ST over Trib to Beaver Creek 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 December 2022.

How much traffic does W 12th ST over Trib to Beaver Creek carry?

About 34 vehicles per day (2022 count).

How long is W 12th ST over Trib to Beaver Creek?

The structure is 59 ft (18 m) long with a longest span of 20 ft (6.1 m) and a deck 23 ft wide.

Who owns W 12th ST over Trib to Beaver Creek?

It is owned by the County Highway Agency.