US Bridges

Bumpy Oak Road over Mattawoman Creek

FairPosted for load

Charles County, Maryland · 0.8 MI N Ashland RD · Structure no. 200000CH0005010

Built
1978
47 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
136 ft
3 main spans
Daily traffic
4,509
2015 count
Owner
County
County Highway Agency

About this bridge

Bumpy Oak Road over Mattawoman Creek is a steel stringer/multi-beam or girder carrying Bumpy Oak Road over Mattawoman Creek in Charles County, Maryland. It was built in 1978, so it is 47 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 6 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 4,509 vehicles a day, roughly 5% of them trucks, projected to reach 4,960 by 2035. The structure is 136 ft (41.5 m) long and 42 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesBumpy Oak Road
CrossesMattawoman Creek
Location0.8 MI N Ashland RD
RouteCounty Highway 138
CountyCharles County
StateMaryland
Coordinates38.5795, -77.07522
Functional classRural 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
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating77.5 US tons
Inventory rating46.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length136 ft (41.5 m)
Longest span51 ft (15.5 m)
Deck width42 ft (12.7 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,509 (2015)
Projected traffic4,960 by 2035
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Bumpy Oak Road over Mattawoman Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Bumpy Oak Road over Mattawoman 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 August 2023.

How much traffic does Bumpy Oak Road over Mattawoman Creek carry?

About 4,509 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Bumpy Oak Road over Mattawoman Creek?

The structure is 136 ft (41.5 m) long with a longest span of 51 ft (15.5 m) and a deck 42 ft wide.

Who owns Bumpy Oak Road over Mattawoman Creek?

It is owned by the County Highway Agency.