US Bridges

Is 29 S over Platte Rvr

FairPosted for load

Platte County, Missouri · S 25 T 53 N R 35 W · Structure no. 6225

Built
1950
75 years old, rebuilt 1985
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
704 ft
3 main spans
Daily traffic
18,026
2024 count
Owner
State
State Highway Agency

About this bridge

Is 29 S over Platte Rvr is a steel continuous stringer/multi-beam or girder carrying Is 29 S over Platte Rvr in Platte County, Missouri. It was built in 1950 and reconstructed in 1985, so it is 75 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 18,026 vehicles a day, roughly 20% of them trucks, projected to reach 36,953 by 2044. The structure is 704 ft (214.6 m) long and 42 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesIs 29 S
CrossesPlatte Rvr
LocationS 25 T 53 N R 35 W
RouteInterstate 29
Coordinates39.37769, -94.78073
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.7 US tons
Inventory rating25.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+7 approach)
Design loadH 20
Structure length704 ft (214.6 m)
Longest span115 ft (35.1 m)
Deck width42 ft (12.7 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,026 (2024)
Projected traffic36,953 by 2044
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 Is 29 S over Platte Rvr built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1985.

What condition is Is 29 S over Platte Rvr 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 July 2024.

How much traffic does Is 29 S over Platte Rvr carry?

About 18,026 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is Is 29 S over Platte Rvr?

The structure is 704 ft (214.6 m) long with a longest span of 115 ft (35.1 m) and a deck 42 ft wide.

Who owns Is 29 S over Platte Rvr?

It is owned by the State Highway Agency.