US Bridges

Md 355 over Little Seneca Creek

Fair

Montgomery County, Maryland · 1.44 Miles North of Md 27 · Structure no. 100000150054010

Built
1922
103 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete
Length
28 ft
1 main span
Daily traffic
13,820
2009 count
Owner
State
State Highway Agency

About this bridge

Md 355 over Little Seneca Creek is a concrete tee beam carrying Md 355 over Little Seneca Creek in Montgomery County, Maryland. It was built in 1922, so it is 103 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 5 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 13,820 vehicles a day, roughly 8% of them trucks, projected to reach 16,972 by 2026. The structure is 28 ft (8.5 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMd 355
CrossesLittle Seneca Creek
Location1.44 Miles North of Md 27
RouteState Highway 355
CountyMontgomery County
StateMaryland
Coordinates39.22148, -77.2596
Functional classUrban Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.5 US tons
Inventory rating54.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span25 ft (7.6 m)
Deck width27 ft (8.1 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,820 (2009)
Projected traffic16,972 by 2026
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$50,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 355 over Little Seneca Creek built?

It was built in 1922, making it 103 years old in 2025.

What condition is Md 355 over Little Seneca Creek 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 August 2024.

How much traffic does Md 355 over Little Seneca Creek carry?

About 13,820 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 355 over Little Seneca Creek?

The structure is 28 ft (8.5 m) long with a longest span of 25 ft (7.6 m) and a deck 27 ft wide.

Who owns Md 355 over Little Seneca Creek?

It is owned by the State Highway Agency.