US Bridges

I-77 Nbl over RTE 629

Fair

Wythe County, Virginia · 6.73 Car Cl & 1.56 to 81 · Structure no. 000000000019580

Built
1978
47 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Concrete
Length
134 ft
3 main spans
Daily traffic
21,266
2022 count
Owner
State
State Highway Agency

About this bridge

I-77 Nbl over RTE 629 is a concrete tee beam carrying I-77 Nbl over RTE 629 in Wythe County, Virginia. It was built in 1978, so it is 47 years old, younger than the Virginia average of 50.7 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 21,266 vehicles a day, roughly 1% of them trucks, projected to reach 23,712 by 2045. The structure is 134 ft (40.9 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-77 Nbl
CrossesRTE 629
Location6.73 Car Cl & 1.56 to 81
RouteInterstate 77
CountyWythe County
StateVirginia
Coordinates36.92999, -80.90956
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionFebruary 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 geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating99 US tons
Inventory rating75.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length134 ft (40.9 m)
Longest span46 ft (14 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,266 (2022)
Projected traffic23,712 by 2045
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$157.3 million (2019 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-77 Nbl over RTE 629 built?

It was built in 1978, making it 47 years old in 2025.

What condition is I-77 Nbl over RTE 629 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 February 2023.

How much traffic does I-77 Nbl over RTE 629 carry?

About 21,266 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is I-77 Nbl over RTE 629?

The structure is 134 ft (40.9 m) long with a longest span of 46 ft (14 m) and a deck 44 ft wide.

Who owns I-77 Nbl over RTE 629?

It is owned by the State Highway Agency.