US Bridges

County RD 79 over Henderson CR

Fair

Iron County, Missouri · S 16 T 34 N R 1 W · Structure no. 14926

Built
1935
90 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete
Length
42 ft
2 main spans
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 79 over Henderson CR is a concrete slab carrying County RD 79 over Henderson CR in Iron County, Missouri. It was built in 1935, so it is 90 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 48 by 2043. The structure is 42 ft (12.8 m) long and 23 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCounty RD 79
CrossesHenderson CR
LocationS 16 T 34 N R 1 W
RouteCounty Highway 79
CountyIron County
StateMissouri
Coordinates37.6408, -91.0404
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length42 ft (12.8 m)
Longest span20 ft (6.1 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic48 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 79 over Henderson CR built?

It was built in 1935, making it 90 years old in 2025.

What condition is County RD 79 over Henderson 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 February 2025.

How much traffic does County RD 79 over Henderson CR carry?

About 40 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 79 over Henderson CR?

The structure is 42 ft (12.8 m) long with a longest span of 20 ft (6.1 m) and a deck 23 ft wide.

Who owns County RD 79 over Henderson CR?

It is owned by the County Highway Agency.