US Bridges

Md 108 over Patuxent River

Fair

Montgomery County, Maryland · On Howard CO Line · Structure no. 100000150008010

Built
1928
97 years old
Condition
Fair
inspected September 2024
Type
Arch - Deck
Concrete
Length
85 ft
1 main span
Daily traffic
12,871
2013 count
Owner
State
State Highway Agency

About this bridge

Md 108 over Patuxent River is a concrete arch - deck carrying Md 108 over Patuxent River in Montgomery County, Maryland. It was built in 1928, so it is 97 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 12,871 vehicles a day, roughly 8% of them trucks, projected to reach 16,038 by 2026. The structure is 85 ft (25.9 m) long and 27 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesMd 108
CrossesPatuxent River
LocationOn Howard CO Line
RouteState Highway 108
CountyMontgomery County
StateMaryland
Coordinates39.16211, -76.97367
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length85 ft (25.9 m)
Longest span85 ft (25.9 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,871 (2013)
Projected traffic16,038 by 2026
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$221,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 108 over Patuxent River built?

It was built in 1928, making it 97 years old in 2025.

What condition is Md 108 over Patuxent River 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 September 2024.

How much traffic does Md 108 over Patuxent River carry?

About 12,871 vehicles per day (2013 count), of which roughly 8% are trucks.

How long is Md 108 over Patuxent River?

The structure is 85 ft (25.9 m) long with a longest span of 85 ft (25.9 m) and a deck 27 ft wide.

Who owns Md 108 over Patuxent River?

It is owned by the State Highway Agency.