US Bridges

N18 over Stream

Fair

Frontier County, Nebraska · 1SE Curtis · Structure no. S018 00110

Built
1945
80 years old, rebuilt 1965
Condition
Fair
inspected April 2024
Type
Culvert
Concrete
Length
34 ft
2 main spans
Daily traffic
490
2018 count
Owner
State
State Highway Agency

About this bridge

N18 over Stream is a concrete culvert carrying N18 over Stream in Frontier County, Nebraska. It was built in 1945 and reconstructed in 1965, so it is 80 years old, older than the Nebraska average of 47.1 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 490 vehicles a day, roughly 9% of them trucks, projected to reach 637 by 2038. The structure is 34 ft (10.4 m) long. If it were closed, the detour would be 31.1 mi (50 km).

Location

Open in Google Maps
CarriesN18
CrossesStream
Location1SE Curtis
RouteState Highway 18
CountyFrontier County
StateNebraska
Coordinates40.6148, -100.5122
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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.4 US tons
Inventory rating24.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length34 ft (10.4 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic490 (2018)
Projected traffic637 by 2038
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 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 N18 over Stream built?

It was built in 1945, making it 80 years old in 2025. It was reconstructed in 1965.

What condition is N18 over Stream 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 N18 over Stream carry?

About 490 vehicles per day (2018 count), of which roughly 9% are trucks.

How long is N18 over Stream?

The structure is 34 ft (10.4 m) long with a longest span of 15 ft (4.6 m).

Who owns N18 over Stream?

It is owned by the State Highway Agency.