US Bridges

Is 29 N over Cst NW 56th ST

Good

Platte County, Missouri · S 28 T 1 N R 33 W · Structure no. 36509

Built
2021
4 years old
Condition
Good
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
72 ft
1 main span
Daily traffic
134,485
2024 count
Owner
State
State Highway Agency

About this bridge

Is 29 N over Cst NW 56th ST is a prestressed concrete tee beam carrying Is 29 N over Cst NW 56th ST 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 134,485 vehicles a day, roughly 6% of them trucks, projected to reach 275,694 by 2044. The structure is 72 ft (21.8 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIs 29 N
CrossesCst NW 56th ST
LocationS 28 T 1 N R 33 W
RouteInterstate 29
Coordinates39.19641, -94.62064
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure9 ExcellentNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating55.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length72 ft (21.8 m)
Longest span68 ft (20.7 m)
Deck width63 ft (19.1 m)
Roadway width61 ft (18.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic134,485 (2024)
Projected traffic275,694 by 2044
Trucks6%
Lanes on structure4
Traffic directionTwo-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 Cst NW 56th ST built?

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

What condition is Is 29 N over Cst NW 56th ST 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 Cst NW 56th ST carry?

About 134,485 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Is 29 N over Cst NW 56th ST?

The structure is 72 ft (21.8 m) long with a longest span of 68 ft (20.7 m) and a deck 63 ft wide.

Who owns Is 29 N over Cst NW 56th ST?

It is owned by the State Highway Agency.