US Bridges

Nd Highway 15 over I-29/THOMPSON Interchang

Fair

Grand Forks County, North Dakota · Junction Nd 15 · Structure no. 0029130043

Built
1967
58 years old, rebuilt 1983
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
265 ft
4 main spans
Daily traffic
2,850
2019 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 15 over I-29/THOMPSON Interchang is a steel continuous stringer/multi-beam or girder carrying Nd Highway 15 over I-29/THOMPSON Interchang in Grand Forks County, North Dakota. It was built in 1967 and reconstructed in 1983, so it is 58 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 5 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 2,850 vehicles a day, roughly 11% of them trucks, projected to reach 2,850 by 2039. The structure is 265 ft (80.8 m) long and 35 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesNd Highway 15
CrossesI-29/THOMPSON Interchang
LocationJunction Nd 15
RouteState Highway 15
CountyGrand Forks County
StateNorth Dakota
Coordinates47.77367, -97.07776
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating73.6 US tons
Inventory rating44 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 span93 ft (28.3 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,850 (2019)
Projected traffic2,850 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed14.3 mi (23 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$567,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nd Highway 15 over I-29/THOMPSON Interchang built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1983.

What condition is Nd Highway 15 over I-29/THOMPSON Interchang 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 April 2024.

How much traffic does Nd Highway 15 over I-29/THOMPSON Interchang carry?

About 2,850 vehicles per day (2019 count), of which roughly 11% are trucks.

How long is Nd Highway 15 over I-29/THOMPSON Interchang?

The structure is 265 ft (80.8 m) long with a longest span of 93 ft (28.3 m) and a deck 35 ft wide.

Who owns Nd Highway 15 over I-29/THOMPSON Interchang?

It is owned by the State Highway Agency.