US Bridges

77 1/2 Ave. over Heart River

Fair

Grant County, North Dakota · 18 North 11 West of Elgin · Structure no. 000000019101050

Built
1958
67 years old
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
176 ft
3 main spans
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

77 1/2 Ave. over Heart River is a prestressed concrete box beam or girders - multiple carrying 77 1/2 Ave. over Heart River in Grant County, North Dakota. It was built in 1958, so it is 67 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 50 vehicles a day, projected to reach 34 by 2042. The structure is 176 ft (53.6 m) long and 28 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
Carries77 1/2 Ave.
CrossesHeart River
Location18 North 11 West of Elgin
RouteCounty Highway 0
CountyGrant County
StateNorth Dakota
Coordinates46.65812, -102.07985
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating55.8 US tons
Inventory rating33.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadUnknown
Structure length176 ft (53.6 m)
Longest span57 ft (17.4 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic34 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 77 1/2 Ave. over Heart River built?

It was built in 1958, making it 67 years old in 2025.

What condition is 77 1/2 Ave. 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 September 2024.

How much traffic does 77 1/2 Ave. over Heart River carry?

About 50 vehicles per day (2022 count).

How long is 77 1/2 Ave. over Heart River?

The structure is 176 ft (53.6 m) long with a longest span of 57 ft (17.4 m) and a deck 28 ft wide.

Who owns 77 1/2 Ave. over Heart River?

It is owned by the County Highway Agency.