US Bridges

Grosvenor Lane over Is 270

Fair

Montgomery County, Maryland · 0.27 Mile North of I-495 · Structure no. 100000150077010

Built
1958
67 years old, rebuilt 2007
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
275 ft
4 main spans
Daily traffic
4,422
2006 count
Owner
State
State Highway Agency

About this bridge

Grosvenor Lane over Is 270 is a steel stringer/multi-beam or girder carrying Grosvenor Lane over Is 270 in Montgomery County, Maryland. It was built in 1958 and reconstructed in 2007, so it is 67 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 4,422 vehicles a day, roughly 5% of them trucks, projected to reach 5,099 by 2026. The structure is 275 ft (83.8 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesGrosvenor Lane
CrossesIs 270
Location0.27 Mile North of I-495
RouteCounty Highway 326
CountyMontgomery County
StateMaryland
Coordinates39.0226, -77.10611
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.5 US tons
Inventory rating54 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length275 ft (83.8 m)
Longest span78 ft (23.8 m)
Deck width38 ft (11.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,422 (2006)
Projected traffic5,099 by 2026
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$693,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Grosvenor Lane over Is 270 built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2007.

What condition is Grosvenor Lane over Is 270 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 2023.

How much traffic does Grosvenor Lane over Is 270 carry?

About 4,422 vehicles per day (2006 count), of which roughly 5% are trucks.

How long is Grosvenor Lane over Is 270?

The structure is 275 ft (83.8 m) long with a longest span of 78 ft (23.8 m) and a deck 38 ft wide.

Who owns Grosvenor Lane over Is 270?

It is owned by the State Highway Agency.