US Bridges

Mo 143 S over Hawk Br

Fair

Iron County, Missouri · S 10 T 30 N R 4 E · Structure no. 2081

Built
1973
52 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
590
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 143 S over Hawk Br is a concrete continuous culvert carrying Mo 143 S over Hawk Br in Iron County, Missouri. It was built in 1973, so it is 52 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 590 vehicles a day, roughly 6% of them trucks, projected to reach 826 by 2044. The structure is 28 ft (8.5 m) long and 49 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

CarriesMo 143 S
CrossesHawk Br
LocationS 10 T 30 N R 4 E
RouteState Highway 143
Coordinates37.30099, -90.58964
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.2 US tons
Inventory rating63.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length28 ft (8.5 m)
Longest span13 ft (4 m)
Deck width49 ft (14.8 m)
Roadway width47 ft (14.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic590 (2024)
Projected traffic826 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 143 S over Hawk Br built?

It was built in 1973, making it 52 years old in 2025.

What condition is Mo 143 S over Hawk Br 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 October 2023.

How much traffic does Mo 143 S over Hawk Br carry?

About 590 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Mo 143 S over Hawk Br?

The structure is 28 ft (8.5 m) long with a longest span of 13 ft (4 m) and a deck 49 ft wide.

Who owns Mo 143 S over Hawk Br?

It is owned by the State Highway Agency.