US Bridges

County Highway over I-29/MERRIFIELD Sep

Good

Grand Forks County, North Dakota · 5 North Nd 15 · Structure no. 0029135082

Built
1968
57 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
300 ft
4 main spans
Daily traffic
675
2019 count
Owner
State
State Highway Agency

About this bridge

County Highway over I-29/MERRIFIELD Sep is a steel continuous stringer/multi-beam or girder carrying County Highway over I-29/MERRIFIELD Sep in Grand Forks County, North Dakota. It was built in 1968, so it is 57 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 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 675 vehicles a day, roughly 10% of them trucks, projected to reach 675 by 2039. The structure is 300 ft (91.4 m) long and 34 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCounty Highway
CrossesI-29/MERRIFIELD Sep
Location5 North Nd 15
RouteCounty Highway 1824
CountyGrand Forks County
StateNorth Dakota
Coordinates47.84587, -97.08288
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating61.6 US tons
Inventory rating36.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length300 ft (91.4 m)
Longest span107 ft (32.6 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic675 (2019)
Projected traffic675 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Highway over I-29/MERRIFIELD Sep built?

It was built in 1968, making it 57 years old in 2025.

What condition is County Highway over I-29/MERRIFIELD Sep 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 April 2024.

How much traffic does County Highway over I-29/MERRIFIELD Sep carry?

About 675 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is County Highway over I-29/MERRIFIELD Sep?

The structure is 300 ft (91.4 m) long with a longest span of 107 ft (32.6 m) and a deck 34 ft wide.

Who owns County Highway over I-29/MERRIFIELD Sep?

It is owned by the State Highway Agency.