US Bridges

Md 355 SB over Md 355 Ramp 1

Fair

Montgomery County, Maryland · 0.1 Mile N of Is 495 Wbl · Structure no. 100000150117010

Built
1959
66 years old, rebuilt 1997
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
139 ft
3 main spans
Daily traffic
55,020
2009 count
Owner
State
State Highway Agency

About this bridge

Md 355 SB over Md 355 Ramp 1 is a steel continuous stringer/multi-beam or girder carrying Md 355 SB over Md 355 Ramp 1 in Montgomery County, Maryland. It was built in 1959 and reconstructed in 1997, so it is 66 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 139 ft (42.4 m) long and 42 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMd 355 SB
CrossesMd 355 Ramp 1
Location0.1 Mile N of Is 495 Wbl
RouteState Highway 355
CountyMontgomery County
StateMaryland
Coordinates39.01979, -77.10295
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
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 rating66.5 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length139 ft (42.4 m)
Longest span50 ft (15.2 m)
Deck width42 ft (12.7 m)
Roadway width36 ft (11 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
CrossesHighway
Detour if closed3.1 mi (5 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$383,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Md 355 SB over Md 355 Ramp 1 built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1997.

What condition is Md 355 SB over Md 355 Ramp 1 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 November 2024.

How much traffic does Md 355 SB over Md 355 Ramp 1 carry?

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

How long is Md 355 SB over Md 355 Ramp 1?

The structure is 139 ft (42.4 m) long with a longest span of 50 ft (15.2 m) and a deck 42 ft wide.

Who owns Md 355 SB over Md 355 Ramp 1?

It is owned by the State Highway Agency.