US Bridges

Md 187B (rockledge over 1S 270

Good

Montgomery County, Maryland · 0.29 Mile North of Md 187 · Structure no. 100000150168010

Built
2002
23 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
174 ft
2 main spans
Daily traffic
19,205
2008 count
Owner
State
State Highway Agency

About this bridge

Md 187B (rockledge over 1S 270 is a steel continuous stringer/multi-beam or girder carrying Md 187B (rockledge over 1S 270 in Montgomery County, Maryland. It was built in 2002, so it is 23 years old, younger than the Maryland average of 52.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 19,205 vehicles a day, projected to reach 22,143 by 2026. The structure is 174 ft (53 m) long and 84 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMd 187B (rockledge
Crosses1S 270
Location0.29 Mile North of Md 187
RouteState Highway 187B
CountyMontgomery County
StateMaryland
Coordinates39.03135, -77.13159
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating67 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length174 ft (53 m)
Longest span86 ft (26.2 m)
Deck width84 ft (25.5 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,205 (2008)
Projected traffic22,143 by 2026
Trucks—
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Md 187B (rockledge over 1S 270 built?

It was built in 2002, making it 23 years old in 2025.

What condition is Md 187B (rockledge over 1S 270 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Md 187B (rockledge over 1S 270 carry?

About 19,205 vehicles per day (2008 count).

How long is Md 187B (rockledge over 1S 270?

The structure is 174 ft (53 m) long with a longest span of 86 ft (26.2 m) and a deck 84 ft wide.

Who owns Md 187B (rockledge over 1S 270?

It is owned by the State Highway Agency.