US Bridges

Forest Glen Road over Is 495

Fair

Montgomery County, Maryland · .86 W of Md 97 · Structure no. 100000150127010

Built
1964
61 years old, rebuilt 1971
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
377 ft
6 main spans
Daily traffic
11,684
1994 count
Owner
State
State Highway Agency

About this bridge

Forest Glen Road over Is 495 is a steel stringer/multi-beam or girder carrying Forest Glen Road over Is 495 in Montgomery County, Maryland. It was built in 1964 and reconstructed in 1971, so it is 61 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 5 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 11,684 vehicles a day, roughly 5% of them trucks, projected to reach 13,787 by 2012. The structure is 377 ft (114.9 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesForest Glen Road
CrossesIs 495
Location.86 W of Md 97
RouteCounty Highway 1227
CountyMontgomery County
StateMaryland
Coordinates39.01375, -77.0581
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length377 ft (114.9 m)
Longest span75 ft (22.9 m)
Deck width35 ft (10.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,684 (1994)
Projected traffic13,787 by 2012
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed1.9 mi (3 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$864,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Forest Glen Road over Is 495 built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1971.

What condition is Forest Glen Road over Is 495 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 February 2023.

How much traffic does Forest Glen Road over Is 495 carry?

About 11,684 vehicles per day (1994 count), of which roughly 5% are trucks.

How long is Forest Glen Road over Is 495?

The structure is 377 ft (114.9 m) long with a longest span of 75 ft (22.9 m) and a deck 35 ft wide.

Who owns Forest Glen Road over Is 495?

It is owned by the State Highway Agency.