US Bridges

Poor Mtn. RD./612 over Dry Branch

Fair

Roanoke County, Virginia · 1.00-RTE639; 4.10-RTE916 · Structure no. 000000000014985

Built
1951
74 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
25 ft
1 main span
Daily traffic
320
2018 count
Owner
State
State Highway Agency

About this bridge

Poor Mtn. RD./612 over Dry Branch is a steel stringer/multi-beam or girder carrying Poor Mtn. RD./612 over Dry Branch in Roanoke County, Virginia. It was built in 1951, so it is 74 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 320 vehicles a day, projected to reach 385 by 2042. The structure is 25 ft (7.6 m) long and 24 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

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CarriesPoor Mtn. RD./612
CrossesDry Branch
Location1.00-RTE639; 4.10-RTE916
RouteCounty Highway 612
CountyRoanoke County
StateVirginia
Coordinates37.22864, -80.13323
Functional classRural Local

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 inspectionAugust 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating88 US tons
Inventory rating68 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width24 ft (7.4 m)
Roadway width19 ft (5.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic320 (2018)
Projected traffic385 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$762 million (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Poor Mtn. RD./612 over Dry Branch built?

It was built in 1951, making it 74 years old in 2025.

What condition is Poor Mtn. RD./612 over Dry Branch 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 August 2024.

How much traffic does Poor Mtn. RD./612 over Dry Branch carry?

About 320 vehicles per day (2018 count).

How long is Poor Mtn. RD./612 over Dry Branch?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m) and a deck 24 ft wide.

Who owns Poor Mtn. RD./612 over Dry Branch?

It is owned by the State Highway Agency.