US Bridges

Mo 13 S over Blackjack CR

Fair

Lafayette County, Missouri · S 12 T 48 N R 26 W · Structure no. 4760

Built
1924
101 years old, rebuilt 1988
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
175 ft
3 main spans
Daily traffic
5,666
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 13 S over Blackjack CR is a steel continuous stringer/multi-beam or girder carrying Mo 13 S over Blackjack CR in Lafayette County, Missouri. It was built in 1924 and reconstructed in 1988, so it is 101 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 5,666 vehicles a day, roughly 13% of them trucks, projected to reach 10,482 by 2044. The structure is 175 ft (53.3 m) long and 31 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesMo 13 S
CrossesBlackjack CR
LocationS 12 T 48 N R 26 W
RouteState Highway 13
CountyLafayette County
StateMissouri
Coordinates38.97419, -93.73625
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.6 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length175 ft (53.3 m)
Longest span60 ft (18.3 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,666 (2024)
Projected traffic10,482 by 2044
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemYes

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$1.5 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 13 S over Blackjack CR built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 1988.

What condition is Mo 13 S over Blackjack CR 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 January 2023.

How much traffic does Mo 13 S over Blackjack CR carry?

About 5,666 vehicles per day (2024 count), of which roughly 13% are trucks.

How long is Mo 13 S over Blackjack CR?

The structure is 175 ft (53.3 m) long with a longest span of 60 ft (18.3 m) and a deck 31 ft wide.

Who owns Mo 13 S over Blackjack CR?

It is owned by the State Highway Agency.