US Bridges

79th Ave SW over Antelope Creek

FairPosted for load

Hettinger County, North Dakota · 8 North 12 East of Mott · Structure no. 000000021141090

Built
1958
67 years old, rebuilt 1970
Condition
Fair
inspected September 2024
Type
Slab
Wood or Timber
Length
25 ft
1 main span
Daily traffic
20
2018 count
Owner
County
County Highway Agency

About this bridge

79th Ave SW over Antelope Creek is a wood or timber slab carrying 79th Ave SW over Antelope Creek in Hettinger County, North Dakota. It was built in 1958 and reconstructed in 1970, so it is 67 years old, older 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 5 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 20 vehicles a day, projected to reach 26 by 2038. The structure is 25 ft (7.6 m) long and 21 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries79th Ave SW
CrossesAntelope Creek
Location8 North 12 East of Mott
RouteCounty Highway 0
CountyHettinger County
StateNorth Dakota
Coordinates46.5051, -102.07002
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
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating18.3 US tons
Inventory rating13.3 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2018)
Projected traffic26 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$65,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 79th Ave SW over Antelope Creek built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1970.

What condition is 79th Ave 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 September 2024.

How much traffic does 79th Ave SW over Antelope Creek carry?

About 20 vehicles per day (2018 count).

How long is 79th Ave SW over Antelope Creek?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 21 ft wide.

Who owns 79th Ave SW over Antelope Creek?

It is owned by the County Highway Agency.