US Bridges

Twymans Mill Road over Great Run

Fair

Madison County, Virginia · 1.20 from 614 &.62 to 622 · Structure no. 000000000011827

Built
1959
66 years old, rebuilt 2006
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
319
2022 count
Owner
State
State Highway Agency

About this bridge

Twymans Mill Road over Great Run is a prestressed concrete slab carrying Twymans Mill Road over Great Run in Madison County, Virginia. It was built in 1959 and reconstructed in 2006, so it is 66 years old, older 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 319 vehicles a day, roughly 1% of them trucks, projected to reach 356 by 2042. The structure is 42 ft (12.8 m) long and 24 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesTwymans Mill Road
CrossesGreat Run
Location1.20 from 614 &.62 to 622
RouteCounty Highway 705
Coordinates38.31808, -78.17152
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating66 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20 + Mod
Structure length42 ft (12.8 m)
Longest span42 ft (12.8 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic319 (2022)
Projected traffic356 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Twymans Mill Road over Great Run built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2006.

What condition is Twymans Mill Road over Great Run 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 September 2024.

How much traffic does Twymans Mill Road over Great Run carry?

About 319 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Twymans Mill Road over Great Run?

The structure is 42 ft (12.8 m) long with a longest span of 42 ft (12.8 m) and a deck 24 ft wide.

Who owns Twymans Mill Road over Great Run?

It is owned by the State Highway Agency.