US Bridges

Is 29 S over Platte Rvr Ovrfl

Poor

Platte County, Missouri · S 25 T 53 N R 35 W · Structure no. 6243

Built
1950
75 years old, rebuilt 1992
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
403 ft
6 main spans
Daily traffic
18,026
2024 count
Owner
State
State Highway Agency

About this bridge

Is 29 S over Platte Rvr Ovrfl is a steel continuous stringer/multi-beam or girder carrying Is 29 S over Platte Rvr Ovrfl in Platte County, Missouri. It was built in 1950 and reconstructed in 1992, 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 18,026 vehicles a day, roughly 20% of them trucks, projected to reach 36,953 by 2044. The structure is 403 ft (122.8 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesIs 29 S
CrossesPlatte Rvr Ovrfl
LocationS 25 T 53 N R 35 W
RouteInterstate 29
Coordinates39.37962, -94.78401
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.4 US tons
Inventory rating41.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6 (+2 approach)
Design loadH 20
Structure length403 ft (122.8 m)
Longest span60 ft (18.3 m)
Deck width41 ft (12.4 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
CrossesRelief for waterway
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.7 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Is 29 S over Platte Rvr Ovrfl built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1992.

What condition is Is 29 S over Platte Rvr Ovrfl in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

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

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

How long is Is 29 S over Platte Rvr Ovrfl?

The structure is 403 ft (122.8 m) long with a longest span of 60 ft (18.3 m) and a deck 41 ft wide.

Who owns Is 29 S over Platte Rvr Ovrfl?

It is owned by the State Highway Agency.