US Bridges

Md 355 NB over Is 495 Ol

Fair

Montgomery County, Maryland · 0.07 Mile North of Is 495 · Structure no. 100000150119010

Built
1958
67 years old, rebuilt 2008
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
264 ft
3 main spans
Daily traffic
55,020
2009 count
Owner
State
State Highway Agency

About this bridge

Md 355 NB over Is 495 Ol is a steel stringer/multi-beam or girder carrying Md 355 NB over Is 495 Ol in Montgomery County, Maryland. It was built in 1958 and reconstructed in 2008, 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 55,020 vehicles a day, roughly 8% of them trucks, projected to reach 33,587 by 2026. The structure is 264 ft (80.5 m) long and 45 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMd 355 NB
CrossesIs 495 Ol
Location0.07 Mile North of Is 495
RouteState Highway 355
CountyMontgomery County
StateMaryland
Coordinates39.01725, -77.10075
Functional classUrban Other Principal Arterial

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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 US tons
Inventory rating37.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length264 ft (80.5 m)
Longest span122 ft (37.2 m)
Deck width45 ft (13.6 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55,020 (2009)
Projected traffic33,587 by 2026
Trucks8%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

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$1.6 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Md 355 NB over Is 495 Ol built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2008.

What condition is Md 355 NB 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 March 2023.

How much traffic does Md 355 NB over Is 495 Ol carry?

About 55,020 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 355 NB over Is 495 Ol?

The structure is 264 ft (80.5 m) long with a longest span of 122 ft (37.2 m) and a deck 45 ft wide.

Who owns Md 355 NB over Is 495 Ol?

It is owned by the State Highway Agency.