US Bridges

Is 495 over Northwest Branch

Fair

Montgomery County, Maryland · 1.00 Mile West of Md 650 · Structure no. 100000150137010

Built
1967
58 years old, rebuilt 2012
Condition
Fair
inspected April 2023
Type
Truss - Deck
Steel
Length
506 ft
3 main spans
Daily traffic
222,147
2022 count
Owner
State
State Highway Agency

About this bridge

Is 495 over Northwest Branch is a steel truss - deck carrying Is 495 over Northwest Branch in Montgomery County, Maryland. It was built in 1967 and reconstructed in 2012, so it is 58 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 222,147 vehicles a day, roughly 8% of them trucks, projected to reach 279,277 by 2045. The structure is 506 ft (154.2 m) long and 126 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesIs 495
CrossesNorthwest Branch
Location1.00 Mile West of Md 650
RouteInterstate 495
CountyMontgomery County
StateMaryland
Coordinates39.01719, -76.99486
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating38.5 US tons

Structure

Structure typeTruss - Deck
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length506 ft (154.2 m)
Longest span200 ft (61 m)
Deck width126 ft (38.3 m)
Roadway width119 ft (36.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic222,147 (2022)
Projected traffic279,277 by 2045
Trucks8%
Lanes on structure8
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Is 495 over Northwest Branch built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2012.

What condition is Is 495 over Northwest Branch 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 April 2023.

How much traffic does Is 495 over Northwest Branch carry?

About 222,147 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Is 495 over Northwest Branch?

The structure is 506 ft (154.2 m) long with a longest span of 200 ft (61 m) and a deck 126 ft wide.

Who owns Is 495 over Northwest Branch?

It is owned by the State Highway Agency.