US Bridges

Interstate 29 over BNSF Separation Overhead

Fair

Richland County, North Dakota · 10 North of Nd 13 · Structure no. 0029033013 R

Built
1975
50 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
550 ft
5 main spans
Daily traffic
2,600
2019 count
Owner
State
State Highway Agency

About this bridge

Interstate 29 over BNSF Separation Overhead is a steel continuous stringer/multi-beam or girder carrying Interstate 29 over BNSF Separation Overhead in Richland County, North Dakota. It was built in 1975, so it is 50 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 2,600 vehicles a day, roughly 22% of them trucks, projected to reach 2,600 by 2039. The structure is 550 ft (167.6 m) long and 45 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

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CarriesInterstate 29
CrossesBNSF Separation Overhead
Location10 North of Nd 13
RouteInterstate 29
CountyRichland County
StateNorth Dakota
Coordinates46.41242, -96.82987
Functional classRural Principal Arterial - Interstate

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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating53.6 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length550 ft (167.6 m)
Longest span113 ft (34.4 m)
Deck width45 ft (13.6 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2019)
Projected traffic2,600 by 2039
Trucks22%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Interstate 29 over BNSF Separation Overhead built?

It was built in 1975, making it 50 years old in 2025.

What condition is Interstate 29 over BNSF Separation Overhead 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 2023.

How much traffic does Interstate 29 over BNSF Separation Overhead carry?

About 2,600 vehicles per day (2019 count), of which roughly 22% are trucks.

How long is Interstate 29 over BNSF Separation Overhead?

The structure is 550 ft (167.6 m) long with a longest span of 113 ft (34.4 m) and a deck 45 ft wide.

Who owns Interstate 29 over BNSF Separation Overhead?

It is owned by the State Highway Agency.