US Bridges

County Highway over I-29/HILLSBORO Int

Fair

Traill County, North Dakota · 4 North of Nd 200 South · Structure no. 0029104155

Built
1970
55 years old, rebuilt 1983
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
265 ft
4 main spans
Daily traffic
1,600
2019 count
Owner
State
State Highway Agency

About this bridge

County Highway over I-29/HILLSBORO Int is a steel continuous stringer/multi-beam or girder carrying County Highway over I-29/HILLSBORO Int in Traill County, North Dakota. It was built in 1970 and reconstructed in 1983, so it is 55 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 1,600 vehicles a day, roughly 10% of them trucks, projected to reach 1,700 by 2039. The structure is 265 ft (80.8 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesCounty Highway
CrossesI-29/HILLSBORO Int
Location4 North of Nd 200 South
RouteCounty Highway 4918
CountyTraill County
StateNorth Dakota
Coordinates47.40368, -97.07435
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 alignment7: Better than present minimum criteria
Operating rating69.3 US tons
Inventory rating41.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length265 ft (80.8 m)
Longest span95 ft (29 m)
Deck width41 ft (12.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2019)
Projected traffic1,700 by 2039
Trucks10%
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/HILLSBORO Int built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1983.

What condition is County Highway over I-29/HILLSBORO 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 August 2024.

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

About 1,600 vehicles per day (2019 count), of which roughly 10% are trucks.

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

The structure is 265 ft (80.8 m) long with a longest span of 95 ft (29 m) and a deck 41 ft wide.

Who owns County Highway over I-29/HILLSBORO Int?

It is owned by the State Highway Agency.