US Bridges

Thornbrough ST over Howell CR

Good

Howell County, Missouri · S 21 T 24 N R 8 W · Structure no. 34830

Built
2013
12 years old
Condition
Good
inspected November 2024
Type
Box Beam or Girders - Multiple
Concrete
Length
90 ft
2 main spans
Daily traffic
3,290
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Thornbrough ST over Howell CR is a concrete box beam or girders - multiple carrying Thornbrough ST over Howell CR in Howell County, Missouri. It was built in 2013, so it is 12 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,290 vehicles a day, roughly 10% of them trucks, projected to reach 4,771 by 2043. The structure is 90 ft (27.4 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesThornbrough ST
CrossesHowell CR
LocationS 21 T 24 N R 8 W
RouteCity Street 0
CountyHowell County
StateMissouri
Coordinates36.73769, -91.85746
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.4 US tons
Inventory rating41.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckOther
Main spans2
Design loadHS 20 + Mod
Structure length90 ft (27.4 m)
Longest span45 ft (13.7 m)
Deck width44 ft (13.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,290 (2023)
Projected traffic4,771 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Thornbrough ST over Howell CR built?

It was built in 2013, making it 12 years old in 2025.

What condition is Thornbrough ST over Howell 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 2024.

How much traffic does Thornbrough ST over Howell CR carry?

About 3,290 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Thornbrough ST over Howell CR?

The structure is 90 ft (27.4 m) long with a longest span of 45 ft (13.7 m) and a deck 44 ft wide.

Who owns Thornbrough ST over Howell CR?

It is owned by the City or Municipal Highway Agency.