US Bridges

99th Ave SW over Antelope Creek

Fair

Stark County, North Dakota · 3 South 2 East Gladstone · Structure no. 000000045133140

Built
1973
52 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
20
2018 count
Owner
County
County Highway Agency

About this bridge

99th Ave SW over Antelope Creek is a prestressed concrete box beam or girders - multiple carrying 99th Ave SW over Antelope Creek in Stark County, North Dakota. It was built in 1973, so it is 52 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 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 20 vehicles a day, projected to reach 20 by 2038. The structure is 70 ft (21.3 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries99th Ave SW
CrossesAntelope Creek
Location3 South 2 East Gladstone
RouteCounty Highway 0
CountyStark County
StateNorth Dakota
Coordinates46.81475, -102.53904
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
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 rating57.7 US tons
Inventory rating28.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadH 20
Structure length70 ft (21.3 m)
Longest span68 ft (20.7 m)
Deck width25 ft (7.5 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2018)
Projected traffic20 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 99th Ave SW over Antelope Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is 99th 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 June 2023.

How much traffic does 99th Ave SW over Antelope Creek carry?

About 20 vehicles per day (2018 count).

How long is 99th Ave SW over Antelope Creek?

The structure is 70 ft (21.3 m) long with a longest span of 68 ft (20.7 m) and a deck 25 ft wide.

Who owns 99th Ave SW over Antelope Creek?

It is owned by the County Highway Agency.