US Bridges

Is 81 NB over CSX Trans.

Fair

Washington County, Maryland · 1.28 Miles North of Is 70 · Structure no. 100000210075011

Built
1964
61 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
199 ft
2 main spans
Daily traffic
37,141
2021 count
Owner
State
State Highway Agency

About this bridge

Is 81 NB over CSX Trans. is a steel continuous stringer/multi-beam or girder carrying Is 81 NB over CSX Trans. in Washington County, Maryland. It was built in 1964, so it is 61 years old, older than the Maryland average of 52.6 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 37,141 vehicles a day, roughly 27% of them trucks, projected to reach 37,395 by 2043. The structure is 199 ft (60.7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIs 81 NB
CrossesCSX Trans.
Location1.28 Miles North of Is 70
RouteInterstate 81
CountyWashington County
StateMaryland
Coordinates39.6319, -77.77229
Functional classUrban Principal Arterial - Interstate

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.
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 inspectionOctober 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating61 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+1 approach)
Design loadHS 20
Structure length199 ft (60.7 m)
Longest span78 ft (23.8 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,141 (2021)
Projected traffic37,395 by 2043
Trucks27%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 81 NB over CSX Trans. built?

It was built in 1964, making it 61 years old in 2025.

What condition is Is 81 NB over CSX Trans. 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 October 2024.

How much traffic does Is 81 NB over CSX Trans. carry?

About 37,141 vehicles per day (2021 count), of which roughly 27% are trucks.

How long is Is 81 NB over CSX Trans.?

The structure is 199 ft (60.7 m) long with a longest span of 78 ft (23.8 m) and a deck 43 ft wide.

Who owns Is 81 NB over CSX Trans.?

It is owned by the State Highway Agency.