US Bridges

I-77 SB over Wv Rt 20

Fair

Mercer County, West Virginia · 1.96 MI N of I 460 · Structure no. 00000000028A201

Built
1979
46 years old, rebuilt 2020
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
170 ft
1 main span
Daily traffic
21,800
2022 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-77 SB over Wv Rt 20 is a steel continuous stringer/multi-beam or girder carrying I-77 SB over Wv Rt 20 in Mercer County, West Virginia. It was built in 1979 and reconstructed in 2020, so it is 46 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 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 21,800 vehicles a day, roughly 23% of them trucks, projected to reach 43,600 by 2042. The structure is 170 ft (51.9 m) long and 45 ft wide.

Location

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CarriesI-77 SB
CrossesWv Rt 20
Location1.96 MI N of I 460
RouteInterstate 7700
CountyMercer County
StateWest Virginia
Coordinates37.38651, -81.05459
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 rating68 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20 + Mod
Structure length170 ft (51.9 m)
Longest span70 ft (21.4 m)
Deck width45 ft (13.6 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,800 (2022)
Projected traffic43,600 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 Wv Rt 20 built?

It was built in 1979, making it 46 years old in 2025. It was reconstructed in 2020.

What condition is I-77 SB over Wv Rt 20 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 Wv Rt 20 carry?

About 21,800 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is I-77 SB over Wv Rt 20?

The structure is 170 ft (51.9 m) long with a longest span of 70 ft (21.4 m) and a deck 45 ft wide.

Who owns I-77 SB over Wv Rt 20?

It is owned by the State Toll Authority.