US Bridges

Seven Locks Road over Cabin John Creek

Fair

Montgomery County, Maryland · 0.1 Miles South of Md 190 · Structure no. 200000M-0110010

Built
1980
45 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
85 ft
1 main span
Daily traffic
9,414
2022 count
Owner
County
County Highway Agency

About this bridge

Seven Locks Road over Cabin John Creek is a steel stringer/multi-beam or girder carrying Seven Locks Road over Cabin John Creek in Montgomery County, Maryland. It was built in 1980, so it is 45 years old, younger 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 9,414 vehicles a day, roughly 5% of them trucks, projected to reach 10,167 by 2042. The structure is 85 ft (25.9 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSeven Locks Road
CrossesCabin John Creek
Location0.1 Miles South of Md 190
RouteCounty Highway 148
CountyMontgomery County
StateMaryland
Coordinates38.99057, -77.1612
Functional classUrban Local

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.5 US tons
Inventory rating49.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span80 ft (24.4 m)
Deck width36 ft (11 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,414 (2022)
Projected traffic10,167 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$9,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Seven Locks Road over Cabin John Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Seven Locks Road over Cabin John 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 2023.

How much traffic does Seven Locks Road over Cabin John Creek carry?

About 9,414 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Seven Locks Road over Cabin John Creek?

The structure is 85 ft (25.9 m) long with a longest span of 80 ft (24.4 m) and a deck 36 ft wide.

Who owns Seven Locks Road over Cabin John Creek?

It is owned by the County Highway Agency.