US Bridges

12th ST NW over Drainage

Fair

Bremer County, Iowa · 000000000 · Structure no. 000000000012220

Built
1962
63 years old, rebuilt 1985
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
27 ft
4 main spans
Daily traffic
5,095
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

12th ST NW over Drainage is a concrete continuous culvert carrying 12th ST NW over Drainage in Bremer County, Iowa. It was built in 1962 and reconstructed in 1985, so it is 63 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 5,095 vehicles a day, roughly 3% of them trucks, projected to reach 5,095 by 2043. The structure is 27 ft (8.2 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries12th ST NW
CrossesDrainage
Location000000000
RouteCity Street 0
CountyBremer County
StateIowa
Coordinates42.73077, -92.48512
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating35.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span7 ft (2.1 m)
Deck width49 ft (14.9 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,095 (2022)
Projected traffic5,095 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 12th ST NW over Drainage built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1985.

What condition is 12th ST NW over Drainage 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 March 2023.

How much traffic does 12th ST NW over Drainage carry?

About 5,095 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 12th ST NW over Drainage?

The structure is 27 ft (8.2 m) long with a longest span of 7 ft (2.1 m) and a deck 49 ft wide.

Who owns 12th ST NW over Drainage?

It is owned by the City or Municipal Highway Agency.