US Bridges

Duncan Sc RD 407 over Branch

Fair

Lincoln County, Missouri · S 24 T 50 N R 3 W · Structure no. 28132

Built
1997
28 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
26 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Duncan Sc RD 407 over Branch is a steel stringer/multi-beam or girder carrying Duncan Sc RD 407 over Branch in Lincoln 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 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 80 by 2043. The structure is 26 ft (7.9 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesDuncan Sc RD 407
CrossesBranch
LocationS 24 T 50 N R 3 W
RouteCounty Highway 90
CountyLincoln County
StateMissouri
Coordinates39.08981, -91.20025
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating98.2 US tons
Inventory rating73.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic80 by 2043
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 Duncan Sc RD 407 over Branch built?

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

What condition is Duncan Sc RD 407 over Branch 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 April 2024.

How much traffic does Duncan Sc RD 407 over Branch carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Duncan Sc RD 407 over Branch?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 24 ft wide.

Who owns Duncan Sc RD 407 over Branch?

It is owned by the County Highway Agency.