US Bridges

Rt N N over Indian CR

Fair

Iron County, Missouri · S 13 T 34 N R 3 E · Structure no. 5681

Built
1932
93 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete Continuous
Length
57 ft
3 main spans
Daily traffic
3,718
2024 count
Owner
State
State Highway Agency

About this bridge

Rt N N over Indian CR is a concrete continuous culvert carrying Rt N N over Indian CR in Iron County, Missouri. It was built in 1932, so it is 93 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 3,718 vehicles a day, roughly 15% of them trucks, projected to reach 5,205 by 2044. The structure is 57 ft (17.4 m) long and 30 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesRt N N
CrossesIndian CR
LocationS 13 T 34 N R 3 E
RouteState Highway 0N
CountyIron County
StateMissouri
Coordinates37.65238, -90.6586
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.2 US tons
Inventory rating57.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 15
Structure length57 ft (17.4 m)
Longest span10 ft (3 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,718 (2024)
Projected traffic5,205 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 Rt N N over Indian CR built?

It was built in 1932, making it 93 years old in 2025.

What condition is Rt N N over Indian 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 October 2023.

How much traffic does Rt N N over Indian CR carry?

About 3,718 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is Rt N N over Indian CR?

The structure is 57 ft (17.4 m) long with a longest span of 10 ft (3 m) and a deck 30 ft wide.

Who owns Rt N N over Indian CR?

It is owned by the State Highway Agency.