US Bridges

N47 over Emergency Spillway

Fair

Dawson County, Nebraska · 5S Gothenburg · Structure no. S047 05757

Built
1958
67 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
97 ft
3 main spans
Daily traffic
690
2018 count
Owner
State
State Highway Agency

About this bridge

N47 over Emergency Spillway is a concrete continuous slab carrying N47 over Emergency Spillway in Dawson County, Nebraska. It was built in 1958, so it is 67 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 690 vehicles a day, roughly 12% of them trucks, projected to reach 897 by 2038. The structure is 97 ft (29.6 m) long and 32 ft wide. If it were closed, the detour would be 111.8 mi (180 km).

Location

Open in Google Maps
CarriesN47
CrossesEmergency Spillway
Location5S Gothenburg
RouteState Highway 47
CountyDawson County
StateNebraska
Coordinates40.8512, -100.1672
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating32 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length97 ft (29.6 m)
Longest span39 ft (11.9 m)
Deck width32 ft (9.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic690 (2018)
Projected traffic897 by 2038
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed111.8 mi (180 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 N47 over Emergency Spillway built?

It was built in 1958, making it 67 years old in 2025.

What condition is N47 over Emergency Spillway 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 November 2023.

How much traffic does N47 over Emergency Spillway carry?

About 690 vehicles per day (2018 count), of which roughly 12% are trucks.

How long is N47 over Emergency Spillway?

The structure is 97 ft (29.6 m) long with a longest span of 39 ft (11.9 m) and a deck 32 ft wide.

Who owns N47 over Emergency Spillway?

It is owned by the State Highway Agency.