US Bridges

46th Avenue over Heart River

FairPosted for load

Grant County, North Dakota · 8 East 11 North of Carson · Structure no. 000000019134080

Built
1954
71 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
222 ft
3 main spans
Daily traffic
45
2018 count
Owner
County
County Highway Agency

About this bridge

46th Avenue over Heart River is a steel continuous stringer/multi-beam or girder carrying 46th Avenue over Heart River in Grant County, North Dakota. It was built in 1954, so it is 71 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. Its operating status is: posted for load restriction.

It carries about 45 vehicles a day, projected to reach 45 by 2038. The structure is 222 ft (67.7 m) long and 24 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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Carries46th Avenue
CrossesHeart River
Location8 East 11 North of Carson
RouteCounty Highway 0
CountyGrant County
StateNorth Dakota
Coordinates46.60922, -101.38183
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating26.6 US tons
Inventory rating15.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length222 ft (67.7 m)
Longest span107 ft (32.6 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2018)
Projected traffic45 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 46th Avenue over Heart River built?

It was built in 1954, making it 71 years old in 2025.

What condition is 46th Avenue over Heart River 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 46th Avenue over Heart River carry?

About 45 vehicles per day (2018 count).

How long is 46th Avenue over Heart River?

The structure is 222 ft (67.7 m) long with a longest span of 107 ft (32.6 m) and a deck 24 ft wide.

Who owns 46th Avenue over Heart River?

It is owned by the County Highway Agency.