US Bridges

Aleghany SP.RD/637 over Calhoun Run

Fair

Montgomery County, Virginia · .40-RTE 639; .10-RTE 757 · Structure no. 000000000012253

Built
1932
93 years old
Condition
Fair
inspected January 2025
Type
Culvert
Steel
Length
21 ft
2 main spans
Daily traffic
1,320
2022 count
Owner
State
State Highway Agency

About this bridge

Aleghany SP.RD/637 over Calhoun Run is a steel culvert carrying Aleghany SP.RD/637 over Calhoun Run in Montgomery 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 1,320 vehicles a day, roughly 1% of them trucks, projected to reach 1,472 by 2045. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesAleghany SP.RD/637
CrossesCalhoun Run
Location.40-RTE 639; .10-RTE 757
RouteCounty Highway 637
CountyMontgomery County
StateVirginia
Coordinates37.12941, -80.26489
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating98 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.4 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 traffic1,320 (2022)
Projected traffic1,472 by 2045
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Aleghany SP.RD/637 over Calhoun Run built?

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

What condition is Aleghany SP.RD/637 over Calhoun 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 January 2025.

How much traffic does Aleghany SP.RD/637 over Calhoun Run carry?

About 1,320 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Aleghany SP.RD/637 over Calhoun Run?

The structure is 21 ft (6.4 m) long with a longest span of 9 ft (2.7 m).

Who owns Aleghany SP.RD/637 over Calhoun Run?

It is owned by the State Highway Agency.