US Bridges

County RD 8120 over Trib of Howell CR

Fair

Howell County, Missouri · S 22 T 24 N R 8 W · Structure no. 24770

Built
1926
99 years old, rebuilt 1972
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
170
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 8120 over Trib of Howell CR is a concrete continuous slab carrying County RD 8120 over Trib of Howell CR in Howell County, Missouri. It was built in 1926 and reconstructed in 1972, so it is 99 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 5 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 170 vehicles a day, roughly 10% of them trucks, projected to reach 247 by 2043. The structure is 27 ft (8.2 m) long and 22 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty RD 8120
CrossesTrib of Howell CR
LocationS 22 T 24 N R 8 W
RouteCounty Highway 549
CountyHowell County
StateMissouri
Coordinates36.7342, -91.8326
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length27 ft (8.2 m)
Longest span13 ft (4 m)
Deck width22 ft (6.6 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic170 (2023)
Projected traffic247 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$272,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 8120 over Trib of Howell CR built?

It was built in 1926, making it 99 years old in 2025. It was reconstructed in 1972.

What condition is County RD 8120 over Trib of Howell 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 November 2024.

How much traffic does County RD 8120 over Trib of Howell CR carry?

About 170 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 8120 over Trib of Howell CR?

The structure is 27 ft (8.2 m) long with a longest span of 13 ft (4 m) and a deck 22 ft wide.

Who owns County RD 8120 over Trib of Howell CR?

It is owned by the County Highway Agency.