US Bridges

County Highway over I-29/STATE Line Int

Fair

Richland County, North Dakota · South Dakota Border · Structure no. 0029000013

Built
1974
51 years old, rebuilt 1995
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
255 ft
2 main spans
Daily traffic
750
2019 count
Owner
State
State Highway Agency

About this bridge

County Highway over I-29/STATE Line Int is a steel continuous stringer/multi-beam or girder carrying County Highway over I-29/STATE Line Int in Richland County, North Dakota. It was built in 1974 and reconstructed in 1995, so it is 51 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 750 vehicles a day, roughly 10% of them trucks, projected to reach 1,050 by 2039. The structure is 255 ft (77.7 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCounty Highway
CrossesI-29/STATE Line Int
LocationSouth Dakota Border
RouteCounty Highway 0
CountyRichland County
StateNorth Dakota
Coordinates45.93589, -96.8435
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating52.2 US tons
Inventory rating31.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length255 ft (77.7 m)
Longest span128 ft (39 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2019)
Projected traffic1,050 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Highway over I-29/STATE Line Int built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 1995.

What condition is County Highway over I-29/STATE Line Int 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 May 2024.

How much traffic does County Highway over I-29/STATE Line Int carry?

About 750 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is County Highway over I-29/STATE Line Int?

The structure is 255 ft (77.7 m) long with a longest span of 128 ft (39 m) and a deck 35 ft wide.

Who owns County Highway over I-29/STATE Line Int?

It is owned by the State Highway Agency.