US Bridges

9th Avenue NW over Antelope Creek

Fair

Mercer County, North Dakota · City of Hazen · Structure no. 000000029127190

Built
1983
42 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
90 ft
1 main span
Daily traffic
141
2022 count
Owner
County
County Highway Agency

About this bridge

9th Avenue NW over Antelope Creek is a prestressed concrete box beam or girders - single or spread carrying 9th Avenue NW over Antelope Creek in Mercer County, North Dakota. It was built in 1983, so it is 42 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.

It carries about 141 vehicles a day, roughly 11% of them trucks, projected to reach 190 by 2042. The structure is 90 ft (27.4 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries9th Avenue NW
CrossesAntelope Creek
LocationCity of Hazen
RouteCounty Highway 0
CountyMercer County
StateNorth Dakota
Coordinates47.29886, -101.63776
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.6 US tons
Inventory rating18.3 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length90 ft (27.4 m)
Longest span85 ft (25.9 m)
Deck width41 ft (12.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic141 (2022)
Projected traffic190 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 9th Avenue NW over Antelope Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is 9th Avenue NW 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 9th Avenue NW over Antelope Creek carry?

About 141 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is 9th Avenue NW over Antelope Creek?

The structure is 90 ft (27.4 m) long with a longest span of 85 ft (25.9 m) and a deck 41 ft wide.

Who owns 9th Avenue NW over Antelope Creek?

It is owned by the County Highway Agency.