US Bridges

Forest Glen Road over Sligo Creek

Fair

Montgomery County, Maryland · 0.6 MI East of Md 97 · Structure no. 200000M-0225020

Built
1974
51 years old
Condition
Fair
inspected December 2024
Type
Culvert
Concrete
Length
29 ft
Daily traffic
12,353
2024 count
Owner
County
County Highway Agency

About this bridge

Forest Glen Road over Sligo Creek is a concrete culvert carrying Forest Glen Road over Sligo Creek in Montgomery County, Maryland. It was built in 1974, so it is 51 years old, younger 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 12,353 vehicles a day, roughly 5% of them trucks, projected to reach 14,580 by 2044. The structure is 29 ft (8.8 m) long and 46 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesForest Glen Road
CrossesSligo Creek
Location0.6 MI East of Md 97
RouteCounty Highway 697
CountyMontgomery County
StateMaryland
Coordinates39.01613, -77.03287
Functional classUrban Local

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64.5 US tons
Inventory rating38.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans0
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width46 ft (14 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,353 (2024)
Projected traffic14,580 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Forest Glen Road over Sligo Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is Forest Glen Road over Sligo 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 December 2024.

How much traffic does Forest Glen Road over Sligo Creek carry?

About 12,353 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Forest Glen Road over Sligo Creek?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m) and a deck 46 ft wide.

Who owns Forest Glen Road over Sligo Creek?

It is owned by the County Highway Agency.