US Bridges

55th Avenue SW over Antelope Creek

FairPosted for load

Mercer County, North Dakota · 2 West of Hazen · Structure no. 000000029126180

Built
1979
46 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
10
2018 count
Owner
County
County Highway Agency

About this bridge

55th Avenue SW over Antelope Creek is a prestressed concrete box beam or girders - multiple carrying 55th Avenue SW over Antelope Creek in Mercer County, North Dakota. It was built in 1979, so it is 46 years old, younger than the North Dakota average of 48.2 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. Its operating status is: posted for load restriction.

It carries about 10 vehicles a day, projected to reach 10 by 2038. The structure is 41 ft (12.5 m) long and 21 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries55th Avenue SW
CrossesAntelope Creek
Location2 West of Hazen
RouteCounty Highway 0
CountyMercer County
StateNorth Dakota
Coordinates47.29914, -101.65899
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating13 US tons
Inventory rating10 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length41 ft (12.5 m)
Longest span38 ft (11.6 m)
Deck width21 ft (6.5 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2018)
Projected traffic10 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$105,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 55th Avenue SW over Antelope Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is 55th Avenue SW over Antelope 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 July 2024.

How much traffic does 55th Avenue SW over Antelope Creek carry?

About 10 vehicles per day (2018 count).

How long is 55th Avenue SW over Antelope Creek?

The structure is 41 ft (12.5 m) long with a longest span of 38 ft (11.6 m) and a deck 21 ft wide.

Who owns 55th Avenue SW over Antelope Creek?

It is owned by the County Highway Agency.