US Bridges

Md 650 over Sligo Creek

Fair

Montgomery County, Maryland · 0.43 Mile North of Md 410 · Structure no. 100000150013010

Built
1935
90 years old, rebuilt 2014
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
1 main span
Daily traffic
33,100
2012 count
Owner
State
State Highway Agency

About this bridge

Md 650 over Sligo Creek is a steel stringer/multi-beam or girder carrying Md 650 over Sligo Creek in Montgomery County, Maryland. It was built in 1935 and reconstructed in 2014, so it is 90 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 33,100 vehicles a day, roughly 6% of them trucks, projected to reach 40,400 by 2032. The structure is 65 ft (19.8 m) long and 97 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMd 650
CrossesSligo Creek
Location0.43 Mile North of Md 410
RouteState Highway 650
CountyMontgomery County
StateMaryland
Coordinates38.98052, -76.98949
Functional classUrban Other Principal 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating59 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length65 ft (19.8 m)
Longest span60 ft (18.3 m)
Deck width97 ft (29.5 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,100 (2012)
Projected traffic40,400 by 2032
Trucks6%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 650 over Sligo Creek built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 2014.

What condition is Md 650 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 April 2023.

How much traffic does Md 650 over Sligo Creek carry?

About 33,100 vehicles per day (2012 count), of which roughly 6% are trucks.

How long is Md 650 over Sligo Creek?

The structure is 65 ft (19.8 m) long with a longest span of 60 ft (18.3 m) and a deck 97 ft wide.

Who owns Md 650 over Sligo Creek?

It is owned by the State Highway Agency.