US Bridges

Mo 129 S over BNSF RR

Fair

Linn County, Missouri · S 2 T 57 N R 18 W · Structure no. 5894

Built
1940
85 years old, rebuilt 2007
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
135 ft
3 main spans
Daily traffic
1,127
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 129 S over BNSF RR is a steel continuous stringer/multi-beam or girder carrying Mo 129 S over BNSF RR in Linn County, Missouri. It was built in 1940 and reconstructed in 2007, so it is 85 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,127 vehicles a day, roughly 7% of them trucks, projected to reach 1,409 by 2044. The structure is 135 ft (41.2 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesMo 129 S
CrossesBNSF RR
LocationS 2 T 57 N R 18 W
RouteState Highway 129
CountyLinn County
StateMissouri
Coordinates39.78134, -92.88972
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to 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 rating48.6 US tons
Inventory rating27.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length135 ft (41.2 m)
Longest span50 ft (15.2 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,127 (2024)
Projected traffic1,409 by 2044
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

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 Mo 129 S over BNSF RR built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2007.

What condition is Mo 129 S over BNSF RR 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 September 2024.

How much traffic does Mo 129 S over BNSF RR carry?

About 1,127 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Mo 129 S over BNSF RR?

The structure is 135 ft (41.2 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.

Who owns Mo 129 S over BNSF RR?

It is owned by the State Highway Agency.