US Bridges

I 29 Ia 12 NB over Pierce ST Frontage RD

Fair

Woodbury County, Iowa · 0.4 Mi. S of Jct. US 77 · Structure no. 000000000700335

Built
2017
8 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
192 ft
3 main spans
Daily traffic
16,700
2022 count
Owner
State
State Highway Agency

About this bridge

I 29 Ia 12 NB over Pierce ST Frontage RD is a prestressed concrete stringer/multi-beam or girder carrying I 29 Ia 12 NB over Pierce ST Frontage RD in Woodbury County, Iowa. It was built in 2017, so it is 8 years old, younger 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 16,700 vehicles a day, roughly 18% of them trucks, projected to reach 16,700 by 2043. The structure is 192 ft (58.5 m) long and 77 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 29 Ia 12 NB
CrossesPierce ST Frontage RD
Location0.4 Mi. S of Jct. US 77
RouteInterstate 29
CountyWoodbury County
StateIowa
Coordinates42.48938, -96.40454
Functional classUrban Principal Arterial - Interstate

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length192 ft (58.5 m)
Longest span71 ft (21.6 m)
Deck width77 ft (23.4 m)
Roadway width74 ft (22.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,700 (2022)
Projected traffic16,700 by 2043
Trucks18%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 29 Ia 12 NB over Pierce ST Frontage RD built?

It was built in 2017, making it 8 years old in 2025.

What condition is I 29 Ia 12 NB over Pierce ST Frontage RD 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 2023.

How much traffic does I 29 Ia 12 NB over Pierce ST Frontage RD carry?

About 16,700 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is I 29 Ia 12 NB over Pierce ST Frontage RD?

The structure is 192 ft (58.5 m) long with a longest span of 71 ft (21.6 m) and a deck 77 ft wide.

Who owns I 29 Ia 12 NB over Pierce ST Frontage RD?

It is owned by the State Highway Agency.