US Bridges

I-81SBL over RTE 630 & Mason Creek

Fair

Roanoke County, Virginia · 3.90-RT112; 0.39-RT419 · Structure no. 000000000024925

Built
1997
28 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
346 ft
3 main spans
Daily traffic
34,754
2022 count
Owner
State
State Highway Agency

About this bridge

I-81SBL over RTE 630 & Mason Creek is a steel continuous stringer/multi-beam or girder carrying I-81SBL over RTE 630 & Mason Creek in Roanoke County, Virginia. It was built in 1997, so it is 28 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 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 34,754 vehicles a day, roughly 1% of them trucks, projected to reach 38,719 by 2042. The structure is 346 ft (105.4 m) long and 75 ft wide.

Location

Open in Google Maps
CarriesI-81SBL
CrossesRTE 630 & Mason Creek
Location3.90-RT112; 0.39-RT419
RouteInterstate 81
CountyRoanoke County
StateVirginia
Coordinates37.32023, -80.03892
Functional classUrban 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length346 ft (105.4 m)
Longest span118 ft (36.1 m)
Deck width75 ft (23 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,754 (2022)
Projected traffic38,719 by 2042
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-81SBL over RTE 630 & Mason Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is I-81SBL over RTE 630 & Mason Creek 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 2024.

How much traffic does I-81SBL over RTE 630 & Mason Creek carry?

About 34,754 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is I-81SBL over RTE 630 & Mason Creek?

The structure is 346 ft (105.4 m) long with a longest span of 118 ft (36.1 m) and a deck 75 ft wide.

Who owns I-81SBL over RTE 630 & Mason Creek?

It is owned by the State Highway Agency.