US Bridges

I 29 NB Ia 12 NB over Hamilton Blvd

Fair

Woodbury County, Iowa · 0.6 Mi. N of US 77 · Structure no. 000000000700350

Built
2016
9 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
212 ft
3 main spans
Daily traffic
15,700
2022 count
Owner
State
State Highway Agency

About this bridge

I 29 NB Ia 12 NB over Hamilton Blvd is a prestressed concrete stringer/multi-beam or girder carrying I 29 NB Ia 12 NB over Hamilton Blvd in Woodbury County, Iowa. It was built in 2016, so it is 9 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 15,700 vehicles a day, roughly 19% of them trucks, projected to reach 15,700 by 2044. The structure is 212 ft (64.6 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 29 NB Ia 12 NB
CrossesHamilton Blvd
Location0.6 Mi. N of US 77
RouteInterstate 29
CountyWoodbury County
StateIowa
Coordinates42.49218, -96.42397
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 2024
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 length212 ft (64.6 m)
Longest span97 ft (29.6 m)
Deck width73 ft (22.4 m)
Roadway width70 ft (21.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,700 (2022)
Projected traffic15,700 by 2044
Trucks19%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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 NB Ia 12 NB over Hamilton Blvd built?

It was built in 2016, making it 9 years old in 2025.

What condition is I 29 NB Ia 12 NB over Hamilton Blvd 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 2024.

How much traffic does I 29 NB Ia 12 NB over Hamilton Blvd carry?

About 15,700 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is I 29 NB Ia 12 NB over Hamilton Blvd?

The structure is 212 ft (64.6 m) long with a longest span of 97 ft (29.6 m) and a deck 73 ft wide.

Who owns I 29 NB Ia 12 NB over Hamilton Blvd?

It is owned by the State Highway Agency.