US Bridges

Md 28 over Br of Potomac River

Fair

Frederick County, Maryland · 0.58 MI E of Rock Hall RD · Structure no. 100000100015010

Built
1937
88 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete
Length
21 ft
1 main span
Daily traffic
6,272
2009 count
Owner
State
State Highway Agency

About this bridge

Md 28 over Br of Potomac River is a concrete slab carrying Md 28 over Br of Potomac River in Frederick County, Maryland. It was built in 1937, so it is 88 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 6,272 vehicles a day, roughly 8% of them trucks, projected to reach 7,485 by 2026. The structure is 21 ft (6.4 m) long and 30 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesMd 28
CrossesBr of Potomac River
Location0.58 MI E of Rock Hall RD
RouteState Highway 28
CountyFrederick County
StateMaryland
Coordinates39.27485, -77.51649
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83 US tons
Inventory rating49.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span14 ft (4.3 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,272 (2009)
Projected traffic7,485 by 2026
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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$42,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Md 28 over Br of Potomac River built?

It was built in 1937, making it 88 years old in 2025.

What condition is Md 28 over Br of Potomac 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 January 2025.

How much traffic does Md 28 over Br of Potomac River carry?

About 6,272 vehicles per day (2009 count), of which roughly 8% are trucks.

How long is Md 28 over Br of Potomac River?

The structure is 21 ft (6.4 m) long with a longest span of 14 ft (4.3 m) and a deck 30 ft wide.

Who owns Md 28 over Br of Potomac River?

It is owned by the State Highway Agency.