US Bridges

Mahogany ST over Trib Mid Fk Salt R

Good

Macon County, Missouri · S 12 T 56 N R 13 W · Structure no. 24644

Built
1997
28 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
61 ft
1 main span
Daily traffic
40
2024 count
Owner
County
County Highway Agency

About this bridge

Mahogany ST over Trib Mid Fk Salt R is a steel stringer/multi-beam or girder carrying Mahogany ST over Trib Mid Fk Salt R in Macon County, Missouri. It was built in 1997, so it is 28 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 44 by 2044. The structure is 61 ft (18.6 m) long and 18 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMahogany ST
CrossesTrib Mid Fk Salt R
LocationS 12 T 56 N R 13 W
RouteCounty Highway 523
CountyMacon County
StateMissouri
Coordinates39.66336, -92.31334
Functional classRural Local

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 inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating84.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length61 ft (18.6 m)
Longest span60 ft (18.3 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2024)
Projected traffic44 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Mahogany ST over Trib Mid Fk Salt R built?

It was built in 1997, making it 28 years old in 2025.

What condition is Mahogany ST over Trib Mid Fk Salt R 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 January 2024.

How much traffic does Mahogany ST over Trib Mid Fk Salt R carry?

About 40 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Mahogany ST over Trib Mid Fk Salt R?

The structure is 61 ft (18.6 m) long with a longest span of 60 ft (18.3 m) and a deck 18 ft wide.

Who owns Mahogany ST over Trib Mid Fk Salt R?

It is owned by the County Highway Agency.