US Bridges

Interstate 79 NB over Mon. Co. Rt. 77

Fair

Monongalia County, West Virginia · 3.16 MI South I-68 · Structure no. 00000000031A165

Built
1967
58 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
138 ft
1 main span
Daily traffic
16,350
2022 count
Owner
State
State Highway Agency

About this bridge

Interstate 79 NB over Mon. Co. Rt. 77 is a steel continuous stringer/multi-beam or girder carrying Interstate 79 NB over Mon. Co. Rt. 77 in Monongalia County, West Virginia. It was built in 1967, so it is 58 years old, older than the West Virginia average of 44.7 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.

It carries about 16,350 vehicles a day, roughly 16% of them trucks, projected to reach 23,380 by 2041. The structure is 138 ft (42.1 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesInterstate 79 NB
CrossesMon. Co. Rt. 77
Location3.16 MI South I-68
RouteInterstate 7900
CountyMonongalia County
StateWest Virginia
Coordinates39.53754, -79.99307
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length138 ft (42.1 m)
Longest span51 ft (15.6 m)
Deck width43 ft (13 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,350 (2022)
Projected traffic23,380 by 2041
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedDeck replacement with only incidental widening
Estimated improvement cost$3 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Interstate 79 NB over Mon. Co. Rt. 77 built?

It was built in 1967, making it 58 years old in 2025.

What condition is Interstate 79 NB over Mon. Co. Rt. 77 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 August 2023.

How much traffic does Interstate 79 NB over Mon. Co. Rt. 77 carry?

About 16,350 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is Interstate 79 NB over Mon. Co. Rt. 77?

The structure is 138 ft (42.1 m) long with a longest span of 51 ft (15.6 m) and a deck 43 ft wide.

Who owns Interstate 79 NB over Mon. Co. Rt. 77?

It is owned by the State Highway Agency.