US Bridges

Is 29 N over Rt Aa

Good

Platte County, Missouri · S 33 T 51 N R 33 W · Structure no. 36511

Built
2021
4 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
83 ft
1 main span
Daily traffic
57,469
2024 count
Owner
State
State Highway Agency

About this bridge

Is 29 N over Rt Aa is a prestressed concrete box beam or girders - single or spread carrying Is 29 N over Rt Aa in Platte County, Missouri. It was built in 2021, so it is 4 years old, younger than the Missouri average of 45.1 years.

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

It carries about 57,469 vehicles a day, roughly 6% of them trucks, projected to reach 117,811 by 2044. The structure is 83 ft (25.2 m) long and 71 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIs 29 N
CrossesRt Aa
LocationS 33 T 51 N R 33 W
RouteInterstate 29
Coordinates39.18912, -94.60652
Functional classUrban 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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.3 US tons
Inventory rating26.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length83 ft (25.2 m)
Longest span79 ft (24.1 m)
Deck width71 ft (21.5 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic57,469 (2024)
Projected traffic117,811 by 2044
Trucks6%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 29 N over Rt Aa built?

It was built in 2021, making it 4 years old in 2025.

What condition is Is 29 N over Rt Aa 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 October 2024.

How much traffic does Is 29 N over Rt Aa carry?

About 57,469 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Is 29 N over Rt Aa?

The structure is 83 ft (25.2 m) long with a longest span of 79 ft (24.1 m) and a deck 71 ft wide.

Who owns Is 29 N over Rt Aa?

It is owned by the State Highway Agency.