US Bridges

Ramp Ia 12 over Rp Ia 12 to Ia 376 & Bns

Fair

Woodbury County, Iowa · At EB Ia 12 and SB US 376 · Structure no. 000000000053010

Built
1967
58 years old
Condition
Fair
inspected June 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
306 ft
5 main spans
Daily traffic
3,220
2022 count
Owner
State
State Highway Agency

About this bridge

Ramp Ia 12 over Rp Ia 12 to Ia 376 & Bns is a steel continuous girder and floorbeam system carrying Ramp Ia 12 over Rp Ia 12 to Ia 376 & Bns in Woodbury County, Iowa. It was built in 1967, so it is 58 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 3,220 vehicles a day, roughly 1% of them trucks, projected to reach 3,220 by 2043. The structure is 306 ft (93.3 m) long and 29 ft wide.

Location

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CarriesRamp Ia 12
CrossesRp Ia 12 to Ia 376 & Bns
LocationAt EB Ia 12 and SB US 376
RouteState Highway 376
CountyWoodbury County
StateIowa
Coordinates42.48979, -96.3816
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 23 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating59.4 US tons
Inventory rating35.6 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length306 ft (93.3 m)
Longest span74 ft (22.6 m)
Deck width29 ft (8.8 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,220 (2022)
Projected traffic3,220 by 2043
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp Ia 12 over Rp Ia 12 to Ia 376 & Bns built?

It was built in 1967, making it 58 years old in 2025.

What condition is Ramp Ia 12 over Rp Ia 12 to Ia 376 & Bns 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 June 2023.

How much traffic does Ramp Ia 12 over Rp Ia 12 to Ia 376 & Bns carry?

About 3,220 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Ramp Ia 12 over Rp Ia 12 to Ia 376 & Bns?

The structure is 306 ft (93.3 m) long with a longest span of 74 ft (22.6 m) and a deck 29 ft wide.

Who owns Ramp Ia 12 over Rp Ia 12 to Ia 376 & Bns?

It is owned by the State Highway Agency.