US Bridges

Interstate 29 over 40th Ave SW Sep. - Fargo

Good

Cass County, North Dakota · 2 South of I-94 Int · Structure no. 0029061245 R

Built
1999
26 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
173 ft
3 main spans
Daily traffic
6,950
2019 count
Owner
State
State Highway Agency

About this bridge

Interstate 29 over 40th Ave SW Sep. - Fargo is a prestressed concrete continuous box beam or girders - single or spread carrying Interstate 29 over 40th Ave SW Sep. - Fargo in Cass County, North Dakota. It was built in 1999, so it is 26 years old, younger than the North Dakota average of 48.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,950 vehicles a day, roughly 13% of them trucks, projected to reach 6,950 by 2039. The structure is 173 ft (52.7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesInterstate 29
Crosses40th Ave SW Sep. - Fargo
Location2 South of I-94 Int
RouteInterstate 29
CountyCass County
StateNorth Dakota
Coordinates46.81836, -96.83922
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
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 alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating60.1 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length173 ft (52.7 m)
Longest span61 ft (18.6 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,950 (2019)
Projected traffic6,950 by 2039
Trucks13%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 40th Ave SW Sep. - Fargo built?

It was built in 1999, making it 26 years old in 2025.

What condition is Interstate 29 over 40th Ave SW Sep. - Fargo in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does Interstate 29 over 40th Ave SW Sep. - Fargo carry?

About 6,950 vehicles per day (2019 count), of which roughly 13% are trucks.

How long is Interstate 29 over 40th Ave SW Sep. - Fargo?

The structure is 173 ft (52.7 m) long with a longest span of 61 ft (18.6 m) and a deck 43 ft wide.

Who owns Interstate 29 over 40th Ave SW Sep. - Fargo?

It is owned by the State Highway Agency.