US Bridges

N50 over Mill Creek

Fair

Cass County, Nebraska · 1N Louisville · Structure no. S050 07665

Built
1957
68 years old, rebuilt 2015
Condition
Fair
inspected March 2024
Type
Slab
Concrete Continuous
Length
73 ft
3 main spans
Daily traffic
7,900
2018 count
Owner
State
State Highway Agency

About this bridge

N50 over Mill Creek is a concrete continuous slab carrying N50 over Mill Creek in Cass County, Nebraska. It was built in 1957 and reconstructed in 2015, so it is 68 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 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 7,900 vehicles a day, roughly 16% of them trucks, projected to reach 12,640 by 2038. The structure is 73 ft (22.3 m) long and 33 ft wide. If it were closed, the detour would be 248.5 mi (400 km).

Location

Open in Google Maps
CarriesN50
CrossesMill Creek
Location1N Louisville
RouteState Highway 50
CountyCass County
StateNebraska
Coordinates41.0064, -96.1594
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.3 US tons
Inventory rating26.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length73 ft (22.3 m)
Longest span30 ft (9.1 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,900 (2018)
Projected traffic12,640 by 2038
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed248.5 mi (400 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N50 over Mill Creek built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2015.

What condition is N50 over Mill Creek 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 March 2024.

How much traffic does N50 over Mill Creek carry?

About 7,900 vehicles per day (2018 count), of which roughly 16% are trucks.

How long is N50 over Mill Creek?

The structure is 73 ft (22.3 m) long with a longest span of 30 ft (9.1 m) and a deck 33 ft wide.

Who owns N50 over Mill Creek?

It is owned by the State Highway Agency.