US Bridges

Mo 129 S over N Blackbird CR

Good

Putnam County, Missouri · S 19 T 66 N R 18 W · Structure no. 37444

Built
2024
1 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
134 ft
3 main spans
Daily traffic
551
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 129 S over N Blackbird CR is a steel continuous stringer/multi-beam or girder carrying Mo 129 S over N Blackbird CR in Putnam County, Missouri. It was built in 2024, so it is 1 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 551 vehicles a day, roughly 20% of them trucks, projected to reach 689 by 2044. The structure is 134 ft (40.8 m) long and 27 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesMo 129 S
CrossesN Blackbird CR
LocationS 19 T 66 N R 18 W
RouteState Highway 129
CountyPutnam County
StateMissouri
Coordinates40.50352, -92.96349
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.4 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length134 ft (40.8 m)
Longest span50 ft (15.2 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic551 (2024)
Projected traffic689 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 129 S over N Blackbird CR built?

It was built in 2024, making it 1 years old in 2025.

What condition is Mo 129 S over N Blackbird CR 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 November 2023.

How much traffic does Mo 129 S over N Blackbird CR carry?

About 551 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is Mo 129 S over N Blackbird CR?

The structure is 134 ft (40.8 m) long with a longest span of 50 ft (15.2 m) and a deck 27 ft wide.

Who owns Mo 129 S over N Blackbird CR?

It is owned by the State Highway Agency.