US Bridges

Poor Mtn. RD./612 over Callahan Branch @ Wabun

Fair

Roanoke County, Virginia · 0.77-RTE639N; 0.13-RTE646 · Structure no. 000000000014983

Built
1932
93 years old
Condition
Fair
inspected June 2023
Type
Girder and Floorbeam System
Concrete
Length
36 ft
1 main span
Daily traffic
990
2022 count
Owner
State
State Highway Agency

About this bridge

Poor Mtn. RD./612 over Callahan Branch @ Wabun is a concrete girder and floorbeam system carrying Poor Mtn. RD./612 over Callahan Branch @ Wabun in Roanoke County, Virginia. It was built in 1932, so it is 93 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 990 vehicles a day, roughly 1% of them trucks, projected to reach 1,104 by 2045. The structure is 36 ft (11 m) long and 19 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesPoor Mtn. RD./612
CrossesCallahan Branch @ Wabun
Location0.77-RTE639N; 0.13-RTE646
RouteCounty Highway 612
CountyRoanoke County
StateVirginia
Coordinates37.26451, -80.13892
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length36 ft (11 m)
Longest span36 ft (11 m)
Deck width19 ft (5.9 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic990 (2022)
Projected traffic1,104 by 2045
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$891 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Poor Mtn. RD./612 over Callahan Branch @ Wabun built?

It was built in 1932, making it 93 years old in 2025.

What condition is Poor Mtn. RD./612 over Callahan Branch @ Wabun 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 Poor Mtn. RD./612 over Callahan Branch @ Wabun carry?

About 990 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Poor Mtn. RD./612 over Callahan Branch @ Wabun?

The structure is 36 ft (11 m) long with a longest span of 36 ft (11 m) and a deck 19 ft wide.

Who owns Poor Mtn. RD./612 over Callahan Branch @ Wabun?

It is owned by the State Highway Agency.