US Bridges

Is 495 over Md 97

Good

Montgomery County, Maryland · 0.62 M E of Seminary Road · Structure no. 100000150130010

Built
1960
65 years old, rebuilt 2001
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
198 ft
4 main spans
Daily traffic
232,010
2009 count
Owner
State
State Highway Agency

About this bridge

Is 495 over Md 97 is a steel stringer/multi-beam or girder carrying Is 495 over Md 97 in Montgomery County, Maryland. It was built in 1960 and reconstructed in 2001, so it is 65 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 232,010 vehicles a day, roughly 12% of them trucks, projected to reach 233,070 by 2029. The structure is 198 ft (60.4 m) long and 178 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesIs 495
CrossesMd 97
Location0.62 M E of Seminary Road
RouteInterstate 495
CountyMontgomery County
StateMaryland
Coordinates39.01332, -77.04224
Functional classUrban Principal Arterial - Interstate

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 inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length198 ft (60.4 m)
Longest span63 ft (19.2 m)
Deck width178 ft (54.3 m)
Roadway width172 ft (52.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic232,010 (2009)
Projected traffic233,070 by 2029
Trucks12%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.9 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 495 over Md 97 built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2001.

What condition is Is 495 over Md 97 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 December 2024.

How much traffic does Is 495 over Md 97 carry?

About 232,010 vehicles per day (2009 count), of which roughly 12% are trucks.

How long is Is 495 over Md 97?

The structure is 198 ft (60.4 m) long with a longest span of 63 ft (19.2 m) and a deck 178 ft wide.

Who owns Is 495 over Md 97?

It is owned by the State Highway Agency.