US Bridges

Baltimore Road over Rock Creek

Fair

Montgomery County, Maryland · 0.5 Miles South of Md 28 · Structure no. 200000M-0201010

Built
1911
114 years old
Condition
Fair
inspected July 2023
Type
Arch - Deck
Concrete
Length
59 ft
1 main span
Daily traffic
7,482
2022 count
Owner
County
County Highway Agency

About this bridge

Baltimore Road over Rock Creek is a concrete arch - deck carrying Baltimore Road over Rock Creek in Montgomery County, Maryland. It was built in 1911, so it is 114 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 7,482 vehicles a day, roughly 3% of them trucks, projected to reach 8,679 by 2042. The structure is 59 ft (18 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesBaltimore Road
CrossesRock Creek
Location0.5 Miles South of Md 28
RouteCounty Highway 4560
CountyMontgomery County
StateMaryland
Coordinates39.09, -77.11523
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating36 US tons
Inventory rating36 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length59 ft (18 m)
Longest span59 ft (18 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,482 (2022)
Projected traffic8,679 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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$275,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Baltimore Road over Rock Creek built?

It was built in 1911, making it 114 years old in 2025.

What condition is Baltimore Road over 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 July 2023.

How much traffic does Baltimore Road over Rock Creek carry?

About 7,482 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Baltimore Road over Rock Creek?

The structure is 59 ft (18 m) long with a longest span of 59 ft (18 m) and a deck 24 ft wide.

Who owns Baltimore Road over Rock Creek?

It is owned by the County Highway Agency.