US Bridges

Nbl Route 177 over RTE I 81

Fair

Montgomery County, Virginia · 0.19-RT658; 3.13-SCL Radf · Structure no. 000000000012168

Built
1965
60 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
306 ft
5 main spans
Daily traffic
6,010
2022 count
Owner
State
State Highway Agency

About this bridge

Nbl Route 177 over RTE I 81 is a steel stringer/multi-beam or girder carrying Nbl Route 177 over RTE I 81 in Montgomery County, Virginia. It was built in 1965, so it is 60 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 5 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 6,010 vehicles a day, projected to reach 8,776 by 2042. The structure is 306 ft (93.3 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesNbl Route 177
CrossesRTE I 81
Location0.19-RT658; 3.13-SCL Radf
RouteState Highway 177
CountyMontgomery County
StateVirginia
Coordinates37.09581, -80.50732
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating54 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length306 ft (93.3 m)
Longest span64 ft (19.5 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,010 (2022)
Projected traffic8,776 by 2042
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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$203.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nbl Route 177 over RTE I 81 built?

It was built in 1965, making it 60 years old in 2025.

What condition is Nbl Route 177 over RTE I 81 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 December 2024.

How much traffic does Nbl Route 177 over RTE I 81 carry?

About 6,010 vehicles per day (2022 count).

How long is Nbl Route 177 over RTE I 81?

The structure is 306 ft (93.3 m) long with a longest span of 64 ft (19.5 m) and a deck 35 ft wide.

Who owns Nbl Route 177 over RTE I 81?

It is owned by the State Highway Agency.