US Bridges

I-77 SB over Mercer County Route 7

Fair

Mercer County, West Virginia · .00 MI N of CO Rt 7 I/G · Structure no. 00000000028A204

Built
1977
48 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
174 ft
1 main span
Daily traffic
21,500
2022 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-77 SB over Mercer County Route 7 is a steel continuous stringer/multi-beam or girder carrying I-77 SB over Mercer County Route 7 in Mercer County, West Virginia. It was built in 1977, so it is 48 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 21,500 vehicles a day, roughly 23% of them trucks, projected to reach 43,000 by 2042. The structure is 174 ft (53 m) long and 45 ft wide.

Location

Open in Google Maps
CarriesI-77 SB
CrossesMercer County Route 7
Location.00 MI N of CO Rt 7 I/G
RouteInterstate 7700
CountyMercer County
StateWest Virginia
Coordinates37.42498, -81.06701
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 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 + Mod
Structure length174 ft (53 m)
Longest span76 ft (23.2 m)
Deck width45 ft (13.6 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,500 (2022)
Projected traffic43,000 by 2042
Trucks23%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn an Interstate toll segment under Secretarial agreement
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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 I-77 SB over Mercer County Route 7 built?

It was built in 1977, making it 48 years old in 2025.

What condition is I-77 SB over Mercer County Route 7 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 May 2024.

How much traffic does I-77 SB over Mercer County Route 7 carry?

About 21,500 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is I-77 SB over Mercer County Route 7?

The structure is 174 ft (53 m) long with a longest span of 76 ft (23.2 m) and a deck 45 ft wide.

Who owns I-77 SB over Mercer County Route 7?

It is owned by the State Toll Authority.