US Bridges

County Highway over I-29/DWIGHT Interchange

Fair

Richland County, North Dakota · 4 North of Nd 13 · Structure no. 0029026030

Built
1973
52 years old, rebuilt 2003
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
235 ft
2 main spans
Daily traffic
120
2019 count
Owner
State
State Highway Agency

About this bridge

County Highway over I-29/DWIGHT Interchange is a steel continuous stringer/multi-beam or girder carrying County Highway over I-29/DWIGHT Interchange in Richland County, North Dakota. It was built in 1973 and reconstructed in 2003, 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 120 vehicles a day, roughly 12% of them trucks, projected to reach 120 by 2039. The structure is 235 ft (71.6 m) long and 32 ft wide.

Location

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CarriesCounty Highway
CrossesI-29/DWIGHT Interchange
Location4 North of Nd 13
RouteCounty Highway 0
CountyRichland County
StateNorth Dakota
Coordinates46.31149, -96.83121
Functional classRural Major Collector

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.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length235 ft (71.6 m)
Longest span117 ft (35.7 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2019)
Projected traffic120 by 2039
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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/DWIGHT Interchange built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2003.

What condition is County Highway over I-29/DWIGHT Interchange 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 County Highway over I-29/DWIGHT Interchange carry?

About 120 vehicles per day (2019 count), of which roughly 12% are trucks.

How long is County Highway over I-29/DWIGHT Interchange?

The structure is 235 ft (71.6 m) long with a longest span of 117 ft (35.7 m) and a deck 32 ft wide.

Who owns County Highway over I-29/DWIGHT Interchange?

It is owned by the State Highway Agency.