US Bridges

Dobyns Rd. RT.631 over South Mayo River

Fair

Patrick County, Virginia · 00.40 Rt 644;00.15 Rt 643 · Structure no. 000000000013291

Built
1984
41 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
30 ft
3 main spans
Daily traffic
411
2022 count
Owner
State
State Highway Agency

About this bridge

Dobyns Rd. RT.631 over South Mayo River is a concrete culvert carrying Dobyns Rd. RT.631 over South Mayo River in Patrick County, Virginia. It was built in 1984, so it is 41 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 411 vehicles a day, roughly 1% of them trucks, projected to reach 458 by 2045. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesDobyns Rd. RT.631
CrossesSouth Mayo River
Location00.40 Rt 644;00.15 Rt 643
RouteCounty Highway 631
CountyPatrick County
StateVirginia
Coordinates36.63972, -80.33092
Functional classRural Minor 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length30 ft (9.1 m)
Longest span9 ft (2.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic411 (2022)
Projected traffic458 by 2045
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Dobyns Rd. RT.631 over South Mayo River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Dobyns Rd. RT.631 over South Mayo 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 June 2023.

How much traffic does Dobyns Rd. RT.631 over South Mayo River carry?

About 411 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Dobyns Rd. RT.631 over South Mayo River?

The structure is 30 ft (9.1 m) long with a longest span of 9 ft (2.7 m).

Who owns Dobyns Rd. RT.631 over South Mayo River?

It is owned by the State Highway Agency.