US Bridges

Md 115 over Rock Creek

Fair

Montgomery County, Maryland · 0.34 M E of Olde Mill Run · Structure no. 100000150015020

Built
1970
55 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete
Length
36 ft
Daily traffic
16,981
2013 count
Owner
State
State Highway Agency

About this bridge

Md 115 over Rock Creek is a concrete culvert carrying Md 115 over Rock Creek in Montgomery County, Maryland. It was built in 1970, so it is 55 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 16,981 vehicles a day, roughly 8% of them trucks, projected to reach 21,803 by 2026. The structure is 36 ft (11 m) long. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesMd 115
CrossesRock Creek
Location0.34 M E of Olde Mill Run
RouteState Highway 115
CountyMontgomery County
StateMaryland
Coordinates39.13739, -77.12893
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.5 US tons
Inventory rating45 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans0
Design loadHS 20
Structure length36 ft (11 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,981 (2013)
Projected traffic21,803 by 2026
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 115 over Rock Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Md 115 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 August 2024.

How much traffic does Md 115 over Rock Creek carry?

About 16,981 vehicles per day (2013 count), of which roughly 8% are trucks.

How long is Md 115 over Rock Creek?

The structure is 36 ft (11 m) long with a longest span of 11 ft (3.4 m).

Who owns Md 115 over Rock Creek?

It is owned by the State Highway Agency.