US Bridges

160th St. over Dd #12

Fair

Clinton County, Iowa · 082E20501 · Structure no. 000000000123121

Built
1979
46 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
35
2022 count
Owner
County
County Highway Agency

About this bridge

160th St. over Dd #12 is a prestressed concrete tee beam carrying 160th St. over Dd #12 in Clinton County, Iowa. It was built in 1979, so it is 46 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 35 vehicles a day, projected to reach 35 by 2044. The structure is 41 ft (12.5 m) long and 20 ft wide.

Location

Open in Google Maps
Carries160th St.
CrossesDd #12
Location082E20501
RouteCounty Highway 0
CountyClinton County
StateIowa
Coordinates41.94547, -90.75052
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 48 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 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 rating65 US tons
Inventory rating38.9 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span40 ft (12.2 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2022)
Projected traffic35 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 160th St. over Dd #12 built?

It was built in 1979, making it 46 years old in 2025.

What condition is 160th St. over Dd #12 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 April 2024.

How much traffic does 160th St. over Dd #12 carry?

About 35 vehicles per day (2022 count).

How long is 160th St. over Dd #12?

The structure is 41 ft (12.5 m) long with a longest span of 40 ft (12.2 m) and a deck 20 ft wide.

Who owns 160th St. over Dd #12?

It is owned by the County Highway Agency.