US Bridges

Is 635 S over Mo 9

Good

Platte County, Missouri · S 5 T 50 N R 33 W · Structure no. 2105

Built
1972
53 years old, rebuilt 2014
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
132 ft
3 main spans
Daily traffic
24,505
2024 count
Owner
State
State Highway Agency

About this bridge

Is 635 S over Mo 9 is a steel continuous stringer/multi-beam or girder carrying Is 635 S over Mo 9 in Platte County, Missouri. It was built in 1972 and reconstructed in 2014, so it is 53 years old, older 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 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 24,505 vehicles a day, roughly 18% of them trucks, projected to reach 50,235 by 2044. The structure is 132 ft (40.2 m) long and 67 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesIs 635 S
CrossesMo 9
LocationS 5 T 50 N R 33 W
RouteInterstate 635
Coordinates39.17222, -94.62406
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.4 US tons
Inventory rating42.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length132 ft (40.2 m)
Longest span59 ft (18 m)
Deck width67 ft (20.4 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,505 (2024)
Projected traffic50,235 by 2044
Trucks18%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 635 S over Mo 9 built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 2014.

What condition is Is 635 S over Mo 9 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 635 S over Mo 9 carry?

About 24,505 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 635 S over Mo 9?

The structure is 132 ft (40.2 m) long with a longest span of 59 ft (18 m) and a deck 67 ft wide.

Who owns Is 635 S over Mo 9?

It is owned by the State Highway Agency.