I-77 NB over Mercer County Route 20
GoodMercer County, West Virginia · 1.96 Mi. N. of I 460 · Structure no. 00000000028A200
- Built
- 1977
- 48 years old, rebuilt 2020
- Condition
- Good
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 170 ft
- 1 main span
- Daily traffic
- 13,398
- 2021 count
- Owner
- Toll Authority
- State Toll Authority
About this bridge
I-77 NB over Mercer County Route 20 is a steel continuous stringer/multi-beam or girder carrying I-77 NB over Mercer County Route 20 in Mercer County, West Virginia. It was built in 1977 and reconstructed in 2020, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 13,398 vehicles a day, roughly 23% of them trucks, projected to reach 20,097 by 2041. The structure is 170 ft (51.8 m) long and 45 ft wide.
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-77 NB over Mercer County Route 20 built?
It was built in 1977, making it 48 years old in 2025. It was reconstructed in 2020.
What condition is I-77 NB over Mercer County Route 20 in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.
How much traffic does I-77 NB over Mercer County Route 20 carry?
About 13,398 vehicles per day (2021 count), of which roughly 23% are trucks.
How long is I-77 NB over Mercer County Route 20?
The structure is 170 ft (51.8 m) long with a longest span of 70 ft (21.4 m) and a deck 45 ft wide.
Who owns I-77 NB over Mercer County Route 20?
It is owned by the State Toll Authority.