US Bridges

7th Ave. North over I-29/7th Ave N Sep

Fair

Cass County, North Dakota · 1 North of US 10 · Structure no. 0029065757

Built
1966
59 years old, rebuilt 2012
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
235 ft
4 main spans
Daily traffic
5,125
2019 count
Owner
State
State Highway Agency

About this bridge

7th Ave. North over I-29/7th Ave N Sep is a steel continuous stringer/multi-beam or girder carrying 7th Ave. North over I-29/7th Ave N Sep in Cass County, North Dakota. It was built in 1966 and reconstructed in 2012, so it is 59 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 5,125 vehicles a day, roughly 4% of them trucks, projected to reach 7,500 by 2039. The structure is 235 ft (71.6 m) long and 53 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries7th Ave. North
CrossesI-29/7th Ave N Sep
Location1 North of US 10
RouteCity Street 0
CountyCass County
StateNorth Dakota
Coordinates46.88339, -96.83986
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating60.4 US tons
Inventory rating36.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length235 ft (71.6 m)
Longest span63 ft (19.2 m)
Deck width53 ft (16.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,125 (2019)
Projected traffic7,500 by 2039
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$503,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was 7th Ave. North over I-29/7th Ave N Sep built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2012.

What condition is 7th Ave. North over I-29/7th Ave N Sep 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 June 2024.

How much traffic does 7th Ave. North over I-29/7th Ave N Sep carry?

About 5,125 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is 7th Ave. North over I-29/7th Ave N Sep?

The structure is 235 ft (71.6 m) long with a longest span of 63 ft (19.2 m) and a deck 53 ft wide.

Who owns 7th Ave. North over I-29/7th Ave N Sep?

It is owned by the State Highway Agency.