US Bridges

NB I-29 over Plum Creek

Good

Fremont County, Iowa · 0.5 Mi. S of Jct. SR J24 · Structure no. 000000000600143

Built
2009
16 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
242 ft
3 main spans
Daily traffic
6,100
2022 count
Owner
State
State Highway Agency

About this bridge

NB I-29 over Plum Creek is a prestressed concrete stringer/multi-beam or girder carrying NB I-29 over Plum Creek in Fremont County, Iowa. It was built in 2009, so it is 16 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,100 vehicles a day, roughly 34% of them trucks, projected to reach 6,100 by 2043. The structure is 242 ft (73.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNB I-29
CrossesPlum Creek
Location0.5 Mi. S of Jct. SR J24
RouteInterstate 29
StateIowa
Coordinates40.81439, -95.8059
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating39.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length242 ft (73.8 m)
Longest span97 ft (29.6 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,100 (2022)
Projected traffic6,100 by 2043
Trucks34%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was NB I-29 over Plum Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is NB I-29 over Plum Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does NB I-29 over Plum Creek carry?

About 6,100 vehicles per day (2022 count), of which roughly 34% are trucks.

How long is NB I-29 over Plum Creek?

The structure is 242 ft (73.8 m) long with a longest span of 97 ft (29.6 m) and a deck 43 ft wide.

Who owns NB I-29 over Plum Creek?

It is owned by the State Highway Agency.