US Bridges

Md 185 over Br of Rock Creek

Fair

Montgomery County, Maryland · 0.14 Mile South of Md 586 · Structure no. 100000150052020

Built
1963
62 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
42 ft
Daily traffic
38,552
2009 count
Owner
State
State Highway Agency

About this bridge

Md 185 over Br of Rock Creek is a concrete culvert carrying Md 185 over Br of Rock Creek in Montgomery County, Maryland. It was built in 1963, so it is 62 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 38,552 vehicles a day, roughly 8% of them trucks, projected to reach 57,828 by 2029. The structure is 42 ft (12.8 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesMd 185
CrossesBr of Rock Creek
Location0.14 Mile South of Md 586
RouteState Highway 185
CountyMontgomery County
StateMaryland
Coordinates39.04945, -77.07521
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating65.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans0
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,552 (2009)
Projected traffic57,828 by 2029
Trucks8%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 185 over Br of Rock Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Md 185 over Br of Rock 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 September 2024.

How much traffic does Md 185 over Br of Rock Creek carry?

About 38,552 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 185 over Br of Rock Creek?

The structure is 42 ft (12.8 m) long with a longest span of 18 ft (5.5 m).

Who owns Md 185 over Br of Rock Creek?

It is owned by the State Highway Agency.