US Bridges

N21 over Spring Creek

Good

Dawson County, Nebraska · 1N Lexington · Structure no. S021 02931

Built
1955
70 years old
Condition
Good
inspected November 2023
Type
Slab
Concrete Continuous
Length
47 ft
3 main spans
Daily traffic
1,455
2018 count
Owner
State
State Highway Agency

About this bridge

N21 over Spring Creek is a concrete continuous slab carrying N21 over Spring Creek in Dawson County, Nebraska. It was built in 1955, so it is 70 years old, older 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 1,455 vehicles a day, roughly 12% of them trucks, projected to reach 1,455 by 2038. The structure is 47 ft (14.3 m) long and 37 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Location

Open in Google Maps
CarriesN21
CrossesSpring Creek
Location1N Lexington
RouteState Highway 21
CountyDawson County
StateNebraska
Coordinates40.8029, -99.749
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating23.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length47 ft (14.3 m)
Longest span16 ft (4.9 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,455 (2018)
Projected traffic1,455 by 2038
Trucks12%
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 N21 over Spring Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is N21 over Spring Creek 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 2023.

How much traffic does N21 over Spring Creek carry?

About 1,455 vehicles per day (2018 count), of which roughly 12% are trucks.

How long is N21 over Spring Creek?

The structure is 47 ft (14.3 m) long with a longest span of 16 ft (4.9 m) and a deck 37 ft wide.

Who owns N21 over Spring Creek?

It is owned by the State Highway Agency.