US Bridges

Rt Nn S over Little Black River

Good

Ripley County, Missouri · S 36 T 25 N R 2 W · Structure no. 32626

Built
2008
17 years old
Condition
Good
inspected December 2023
Type
Culvert
Steel
Length
32 ft
6 main spans
Daily traffic
90
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Nn S over Little Black River is a steel culvert carrying Rt Nn S over Little Black River in Ripley County, Missouri. It was built in 2008, so it is 17 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 90 vehicles a day, roughly 26% of them trucks, projected to reach 126 by 2044. The structure is 32 ft (9.8 m) long and 24 ft wide.

CarriesRt Nn S
CrossesLittle Black River
LocationS 36 T 25 N R 2 W
RouteState Highway 0NN
Coordinates36.77958, -90.79869
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection9 ExcellentNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span4 ft (1.2 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2024)
Projected traffic126 by 2044
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Rt Nn S over Little Black River built?

It was built in 2008, making it 17 years old in 2025.

What condition is Rt Nn S over Little Black River 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 December 2023.

How much traffic does Rt Nn S over Little Black River carry?

About 90 vehicles per day (2024 count), of which roughly 26% are trucks.

How long is Rt Nn S over Little Black River?

The structure is 32 ft (9.8 m) long with a longest span of 4 ft (1.2 m) and a deck 24 ft wide.

Who owns Rt Nn S over Little Black River?

It is owned by the State Highway Agency.