US Bridges

Md 410 over Branch of Rock Creek

Fair

Montgomery County, Maryland · 0.34 Mile West of Md 390 · Structure no. 100000150060010

Built
1929
96 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
28 ft
1 main span
Daily traffic
26,931
2009 count
Owner
State
State Highway Agency

About this bridge

Md 410 over Branch of Rock Creek is a concrete slab carrying Md 410 over Branch of Rock Creek in Montgomery County, Maryland. It was built in 1929, so it is 96 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 26,931 vehicles a day, roughly 8% of them trucks, projected to reach 37,070 by 2026. The structure is 28 ft (8.5 m) long and 54 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMd 410
CrossesBranch of Rock Creek
Location0.34 Mile West of Md 390
RouteState Highway 410
CountyMontgomery County
StateMaryland
Coordinates38.99565, -77.04196
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span24 ft (7.3 m)
Deck width54 ft (16.5 m)
Roadway width52 ft (16 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,931 (2009)
Projected traffic37,070 by 2026
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$100,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 410 over Branch of Rock Creek built?

It was built in 1929, making it 96 years old in 2025.

What condition is Md 410 over Branch 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 June 2023.

How much traffic does Md 410 over Branch of Rock Creek carry?

About 26,931 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 410 over Branch of Rock Creek?

The structure is 28 ft (8.5 m) long with a longest span of 24 ft (7.3 m) and a deck 54 ft wide.

Who owns Md 410 over Branch of Rock Creek?

It is owned by the State Highway Agency.