US Bridges

Md 118 over Is 270

Good

Montgomery County, Maryland · 0.33 M N of Aircrafr DR · Structure no. 100000150041010

Built
1954
71 years old, rebuilt 1996
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
320 ft
2 main spans
Daily traffic
28,651
2009 count
Owner
State
State Highway Agency

About this bridge

Md 118 over Is 270 is a steel continuous stringer/multi-beam or girder carrying Md 118 over Is 270 in Montgomery County, Maryland. It was built in 1954 and reconstructed in 1996, so it is 71 years old, older than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 28,651 vehicles a day, roughly 8% of them trucks, projected to reach 32,274 by 2026. The structure is 320 ft (97.5 m) long and 109 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesMd 118
CrossesIs 270
Location0.33 M N of Aircrafr DR
RouteState Highway 118
Coordinates39.18401, -77.25503
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.5 US tons
Inventory rating45 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length320 ft (97.5 m)
Longest span159 ft (48.5 m)
Deck width109 ft (33.2 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,651 (2009)
Projected traffic32,274 by 2026
Trucks8%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed9.9 mi (16 km)
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Md 118 over Is 270 built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1996.

What condition is Md 118 over Is 270 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does Md 118 over Is 270 carry?

About 28,651 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 118 over Is 270?

The structure is 320 ft (97.5 m) long with a longest span of 159 ft (48.5 m) and a deck 109 ft wide.

Who owns Md 118 over Is 270?

It is owned by the State Highway Agency.