US Bridges

Is 270 over CSX Transportation

Fair

Frederick County, Maryland · 1.0 Mile South of Md 85 · Structure no. 100000100074010

Built
1950
75 years old, rebuilt 1983
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
138 ft
3 main spans
Daily traffic
80,340
2009 count
Owner
State
State Highway Agency

About this bridge

Is 270 over CSX Transportation is a steel stringer/multi-beam or girder carrying Is 270 over CSX Transportation in Frederick County, Maryland. It was built in 1950 and reconstructed in 1983, so it is 75 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 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 80,340 vehicles a day, roughly 8% of them trucks, projected to reach 110,800 by 2029. The structure is 138 ft (42.1 m) long and 93 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesIs 270
CrossesCSX Transportation
Location1.0 Mile South of Md 85
RouteInterstate 270
CountyFrederick County
StateMaryland
Coordinates39.36876, -77.40216
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 US tons
Inventory rating37.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length138 ft (42.1 m)
Longest span55 ft (16.8 m)
Deck width93 ft (28.4 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80,340 (2009)
Projected traffic110,800 by 2029
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed6.8 mi (11 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 270 over CSX Transportation built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1983.

What condition is Is 270 over CSX Transportation 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 July 2023.

How much traffic does Is 270 over CSX Transportation carry?

About 80,340 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Is 270 over CSX Transportation?

The structure is 138 ft (42.1 m) long with a longest span of 55 ft (16.8 m) and a deck 93 ft wide.

Who owns Is 270 over CSX Transportation?

It is owned by the State Highway Agency.