US Bridges

Is 270 over Old Farm Creek

Fair

Montgomery County, Maryland · 0.13 Mile N of Is 270Y · Structure no. 100000150080020

Built
1958
67 years old, rebuilt 1988
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
21 ft
Daily traffic
265,320
2009 count
Owner
State
State Highway Agency

About this bridge

Is 270 over Old Farm Creek is a concrete culvert carrying Is 270 over Old Farm Creek in Montgomery County, Maryland. It was built in 1958 and reconstructed in 1988, so it is 67 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 265,320 vehicles a day, roughly 8% of them trucks, projected to reach 364,620 by 2029. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesIs 270
CrossesOld Farm Creek
Location0.13 Mile N of Is 270Y
RouteInterstate 270
Coordinates39.03881, -77.14589
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans0
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic265,320 (2009)
Projected traffic364,620 by 2029
Trucks8%
Lanes on structure12
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Is 270 over Old Farm Creek built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1988.

What condition is Is 270 over Old Farm Creek 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 September 2024.

How much traffic does Is 270 over Old Farm Creek carry?

About 265,320 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Is 270 over Old Farm Creek?

The structure is 21 ft (6.4 m) long with a longest span of 20 ft (6.1 m).

Who owns Is 270 over Old Farm Creek?

It is owned by the State Highway Agency.