US Bridges

Alleghany SP.RD637 over Br. S.F. Roanoke River

Fair

Montgomery County, Virginia · .60-RTE 608; .10-RTE 790 · Structure no. 000000000012254

Built
1988
37 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete
Length
54 ft
2 main spans
Daily traffic
560
2022 count
Owner
State
State Highway Agency

About this bridge

Alleghany SP.RD637 over Br. S.F. Roanoke River is a concrete slab carrying Alleghany SP.RD637 over Br. S.F. Roanoke River in Montgomery County, Virginia. It was built in 1988, so it is 37 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 560 vehicles a day, roughly 1% of them trucks, projected to reach 730 by 2045. The structure is 54 ft (16.5 m) long and 28 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesAlleghany SP.RD637
CrossesBr. S.F. Roanoke River
Location.60-RTE 608; .10-RTE 790
RouteCounty Highway 637
CountyMontgomery County
StateVirginia
Coordinates37.09896, -80.23086
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating83 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length54 ft (16.5 m)
Longest span27 ft (8.2 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic560 (2022)
Projected traffic730 by 2045
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Alleghany SP.RD637 over Br. S.F. Roanoke River built?

It was built in 1988, making it 37 years old in 2025.

What condition is Alleghany SP.RD637 over Br. S.F. Roanoke River 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 January 2025.

How much traffic does Alleghany SP.RD637 over Br. S.F. Roanoke River carry?

About 560 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Alleghany SP.RD637 over Br. S.F. Roanoke River?

The structure is 54 ft (16.5 m) long with a longest span of 27 ft (8.2 m) and a deck 28 ft wide.

Who owns Alleghany SP.RD637 over Br. S.F. Roanoke River?

It is owned by the State Highway Agency.