US Bridges

Maple Avenue over Sligo Creek

FairPosted for load

Montgomery County, Maryland · 0.5 Miles North of Md 410 · Structure no. 200000M-T-01010

Built
1930
95 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete
Length
46 ft
2 main spans
Daily traffic
6,024
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Maple Avenue over Sligo Creek is a concrete slab carrying Maple Avenue over Sligo Creek in Montgomery County, Maryland. It was built in 1930, so it is 95 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. Its operating status is: posted for load restriction.

It carries about 6,024 vehicles a day, roughly 3% of them trucks, projected to reach 7,410 by 2041. The structure is 46 ft (13.9 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMaple Avenue
CrossesSligo Creek
Location0.5 Miles North of Md 410
RouteCity Street 0
CountyMontgomery County
StateMaryland
Coordinates38.98594, -77.00374
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating61 US tons
Inventory rating37 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length46 ft (13.9 m)
Longest span20 ft (6.1 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,024 (2021)
Projected traffic7,410 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$131,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Maple Avenue over Sligo Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is Maple Avenue 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 July 2023.

How much traffic does Maple Avenue over Sligo Creek carry?

About 6,024 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Maple Avenue over Sligo Creek?

The structure is 46 ft (13.9 m) long with a longest span of 20 ft (6.1 m) and a deck 26 ft wide.

Who owns Maple Avenue over Sligo Creek?

It is owned by the City or Municipal Highway Agency.