US Bridges

Blackjack RD S over Is 70

Fair

Lafayette County, Missouri · S 31 T 49 N R 25 W · Structure no. 78

Built
1963
62 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
211 ft
4 main spans
Daily traffic
68
2024 count
Owner
State
State Highway Agency

About this bridge

Blackjack RD S over Is 70 is a concrete continuous slab carrying Blackjack RD S over Is 70 in Lafayette County, Missouri. It was built in 1963, so it is 62 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 68 vehicles a day, roughly 9% of them trucks, projected to reach 99 by 2044. The structure is 211 ft (64.3 m) long and 27 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesBlackjack RD S
CrossesIs 70
LocationS 31 T 49 N R 25 W
RouteCounty Highway 0
CountyLafayette County
StateMissouri
Coordinates38.99371, -93.71159
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length211 ft (64.3 m)
Longest span58 ft (17.7 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic68 (2024)
Projected traffic99 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed11.2 mi (18 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 Blackjack RD S over Is 70 built?

It was built in 1963, making it 62 years old in 2025.

What condition is Blackjack RD S over Is 70 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 2025.

How much traffic does Blackjack RD S over Is 70 carry?

About 68 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Blackjack RD S over Is 70?

The structure is 211 ft (64.3 m) long with a longest span of 58 ft (17.7 m) and a deck 27 ft wide.

Who owns Blackjack RD S over Is 70?

It is owned by the State Highway Agency.