US Bridges

Is 270 SB over Md 80

Fair

Frederick County, Maryland · 3.52 Miles N of Mont CO · Structure no. 100000100078012

Built
1950
75 years old, rebuilt 2012
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
64 ft
1 main span
Daily traffic
81,890
2011 count
Owner
State
State Highway Agency

About this bridge

Is 270 SB over Md 80 is a steel stringer/multi-beam or girder carrying Is 270 SB over Md 80 in Frederick County, Maryland. It was built in 1950 and reconstructed in 2012, 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 81,890 vehicles a day, roughly 9% of them trucks, projected to reach 110,800 by 2029. The structure is 64 ft (19.5 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIs 270 SB
CrossesMd 80
Location3.52 Miles N of Mont CO
RouteInterstate 270
Coordinates39.32349, -77.35725
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating66 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span59 ft (18 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81,890 (2011)
Projected traffic110,800 by 2029
Trucks9%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$177,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 270 SB over Md 80 built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2012.

What condition is Is 270 SB over Md 80 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 Is 270 SB over Md 80 carry?

About 81,890 vehicles per day (2011 count), of which roughly 9% are trucks.

How long is Is 270 SB over Md 80?

The structure is 64 ft (19.5 m) long with a longest span of 59 ft (18 m) and a deck 47 ft wide.

Who owns Is 270 SB over Md 80?

It is owned by the State Highway Agency.