US Bridges

Is 495 over Seven Locks RD

Fair

Montgomery County, Maryland · 0.59 Mile East of Md 190 · Structure no. 100000150106010

Built
1962
63 years old, rebuilt 1990
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
155 ft
3 main spans
Daily traffic
214,005
2009 count
Owner
State
State Highway Agency

About this bridge

Is 495 over Seven Locks RD is a steel stringer/multi-beam or girder carrying Is 495 over Seven Locks RD in Montgomery County, Maryland. It was built in 1962 and reconstructed in 1990, so it is 63 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 214,005 vehicles a day, roughly 25% of them trucks, projected to reach 247,805 by 2029. The structure is 155 ft (47.2 m) long and 156 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIs 495
CrossesSeven Locks RD
Location0.59 Mile East of Md 190
RouteInterstate 495
CountyMontgomery County
StateMaryland
Coordinates38.98363, -77.16072
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 inspectionJune 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 rating83.4 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length155 ft (47.2 m)
Longest span74 ft (22.6 m)
Deck width156 ft (47.5 m)
Roadway width152 ft (46.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic214,005 (2009)
Projected traffic247,805 by 2029
Trucks25%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 495 over Seven Locks RD built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1990.

What condition is Is 495 over Seven Locks RD 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 June 2023.

How much traffic does Is 495 over Seven Locks RD carry?

About 214,005 vehicles per day (2009 count), of which roughly 25% are trucks.

How long is Is 495 over Seven Locks RD?

The structure is 155 ft (47.2 m) long with a longest span of 74 ft (22.6 m) and a deck 156 ft wide.

Who owns Is 495 over Seven Locks RD?

It is owned by the State Highway Agency.