US Bridges

Fort Frederick Acc over C&o Canal

Fair

Washington County, Maryland · 0.3 Miles from Fort Frede · Structure no. 3100010P0000000

Built
1973
52 years old, rebuilt 1984
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
50
2007 count
Owner
Federal
National Park Service

About this bridge

Fort Frederick Acc over C&o Canal is a steel stringer/multi-beam or girder carrying Fort Frederick Acc over C&o Canal in Washington County, Maryland. It was built in 1973 and reconstructed in 1984, so it is 52 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 50 vehicles a day, roughly 1% of them trucks, projected to reach 65 by 2027. The structure is 31 ft (9.5 m) long and 14 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesFort Frederick Acc
CrossesC&o Canal
Location0.3 Miles from Fort Frede
RouteFederal Lands Road 418
Coordinates39.60539, -78.00486
Functional classRural Minor Collector

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.
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 inspectionNovember 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating41 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length31 ft (9.5 m)
Longest span31 ft (9.3 m)
Deck width14 ft (4.3 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2007)
Projected traffic65 by 2027
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$180,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Fort Frederick Acc over C&o Canal built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1984.

What condition is Fort Frederick Acc over C&o Canal 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 November 2023.

How much traffic does Fort Frederick Acc over C&o Canal carry?

About 50 vehicles per day (2007 count), of which roughly 1% are trucks.

How long is Fort Frederick Acc over C&o Canal?

The structure is 31 ft (9.5 m) long with a longest span of 31 ft (9.3 m) and a deck 14 ft wide.

Who owns Fort Frederick Acc over C&o Canal?

It is owned by the National Park Service.