US Bridges

Is 270 over Md 124

Fair

Montgomery County, Maryland · 0.62 Mile North of Md 117 · Structure no. 100000150044010

Built
1955
70 years old, rebuilt 1991
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
174 ft
3 main spans
Daily traffic
154,247
2009 count
Owner
State
State Highway Agency

About this bridge

Is 270 over Md 124 is a steel stringer/multi-beam or girder carrying Is 270 over Md 124 in Montgomery County, Maryland. It was built in 1955 and reconstructed in 1991, so it is 70 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 154,247 vehicles a day, roughly 8% of them trucks, projected to reach 210,107 by 2029. The structure is 174 ft (53 m) long and 202 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesIs 270
CrossesMd 124
Location0.62 Mile North of Md 117
RouteInterstate 270
CountyMontgomery County
StateMaryland
Coordinates39.1487, -77.21648
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 rating73.5 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length174 ft (53 m)
Longest span86 ft (26.2 m)
Deck width202 ft (61.6 m)
Roadway width193 ft (58.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic154,247 (2009)
Projected traffic210,107 by 2029
Trucks8%
Lanes on structure11
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 Md 124 built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1991.

What condition is Is 270 over Md 124 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 Md 124 carry?

About 154,247 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Is 270 over Md 124?

The structure is 174 ft (53 m) long with a longest span of 86 ft (26.2 m) and a deck 202 ft wide.

Who owns Is 270 over Md 124?

It is owned by the State Highway Agency.