US Bridges

I-370 Ramp L(7) over I-370 Ramp M(3)

Good

Montgomery County, Maryland · .23 MI E of Md 355 · Structure no. 100000150195010

Built
2010
15 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
77 ft
1 main span
Daily traffic
3,953
2012 count
Owner
State
State Highway Agency

About this bridge

I-370 Ramp L(7) over I-370 Ramp M(3) is a steel stringer/multi-beam or girder carrying I-370 Ramp L(7) over I-370 Ramp M(3) in Montgomery County, Maryland. It was built in 2010, so it is 15 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 3,953 vehicles a day, projected to reach 5,692 by 2034. The structure is 77 ft (23.5 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesI-370 Ramp L(7)
CrossesI-370 Ramp M(3)
Location.23 MI E of Md 355
RouteInterstate 370
CountyMontgomery County
StateMaryland
Coordinates39.12591, -77.1761
Functional classUrban Principal Arterial - Interstate

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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating70 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length77 ft (23.5 m)
Longest span73 ft (22.3 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,953 (2012)
Projected traffic5,692 by 2034
Trucks—
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-370 Ramp L(7) over I-370 Ramp M(3) built?

It was built in 2010, making it 15 years old in 2025.

What condition is I-370 Ramp L(7) over I-370 Ramp M(3) 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 June 2023.

How much traffic does I-370 Ramp L(7) over I-370 Ramp M(3) carry?

About 3,953 vehicles per day (2012 count).

How long is I-370 Ramp L(7) over I-370 Ramp M(3)?

The structure is 77 ft (23.5 m) long with a longest span of 73 ft (22.3 m) and a deck 32 ft wide.

Who owns I-370 Ramp L(7) over I-370 Ramp M(3)?

It is owned by the State Highway Agency.