US Bridges

Is 270 SB over Is 495 Ol

Fair

Montgomery County, Maryland · 1.04 Mile South of Md 187 · Structure no. 100000150145010

Built
1990
35 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
118 ft
1 main span
Daily traffic
44,696
2017 count
Owner
State
State Highway Agency

About this bridge

Is 270 SB over Is 495 Ol is a steel stringer/multi-beam or girder carrying Is 270 SB over Is 495 Ol in Montgomery County, Maryland. It was built in 1990, so it is 35 years old, younger 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 44,696 vehicles a day, roughly 8% of them trucks, projected to reach 66,416 by 2037. The structure is 118 ft (36 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesIs 270 SB
CrossesIs 495 Ol
Location1.04 Mile South of Md 187
RouteInterstate 270
CountyMontgomery County
StateMaryland
Coordinates39.01991, -77.10544
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating63.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length118 ft (36 m)
Longest span113 ft (34.4 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44,696 (2017)
Projected traffic66,416 by 2037
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 SB over Is 495 Ol built?

It was built in 1990, making it 35 years old in 2025.

What condition is Is 270 SB over Is 495 Ol 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 August 2024.

How much traffic does Is 270 SB over Is 495 Ol carry?

About 44,696 vehicles per day (2017 count), of which roughly 8% are trucks.

How long is Is 270 SB over Is 495 Ol?

The structure is 118 ft (36 m) long with a longest span of 113 ft (34.4 m) and a deck 43 ft wide.

Who owns Is 270 SB over Is 495 Ol?

It is owned by the State Highway Agency.