US Bridges

N40 over South Loup River

Good

Custer County, Nebraska · 0S Arnold · Structure no. S040 00061

Built
1985
40 years old
Condition
Good
inspected November 2024
Type
Slab
Concrete Continuous
Length
82 ft
3 main spans
Daily traffic
445
2018 count
Owner
State
State Highway Agency

About this bridge

N40 over South Loup River is a concrete continuous slab carrying N40 over South Loup River in Custer County, Nebraska. It was built in 1985, so it is 40 years old, younger than the Nebraska average of 47.1 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 445 vehicles a day, roughly 15% of them trucks, projected to reach 579 by 2038. The structure is 82 ft (25 m) long and 37 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

CarriesN40
CrossesSouth Loup River
Location0S Arnold
RouteState Highway 40
Coordinates41.4138, -100.1936
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating38.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length82 ft (25 m)
Longest span32 ft (9.8 m)
Deck width37 ft (11.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic445 (2018)
Projected traffic579 by 2038
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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 N40 over South Loup River built?

It was built in 1985, making it 40 years old in 2025.

What condition is N40 over South Loup 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 November 2024.

How much traffic does N40 over South Loup River carry?

About 445 vehicles per day (2018 count), of which roughly 15% are trucks.

How long is N40 over South Loup River?

The structure is 82 ft (25 m) long with a longest span of 32 ft (9.8 m) and a deck 37 ft wide.

Who owns N40 over South Loup River?

It is owned by the State Highway Agency.