US Bridges

Millbrook Road over Little Antietam Creek

FairPosted for load

Washington County, Maryland · 0.4 MI W of Md RTE 67 · Structure no. 200000W-5982010

Built
1965
60 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
56 ft
2 main spans
Daily traffic
1,467
2023 count
Owner
County
County Highway Agency

About this bridge

Millbrook Road over Little Antietam Creek is a concrete continuous slab carrying Millbrook Road over Little Antietam Creek in Washington County, Maryland. It was built in 1965, so it is 60 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 1,467 vehicles a day, roughly 5% of them trucks, projected to reach 1,964 by 2043. The structure is 56 ft (17.1 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMillbrook Road
CrossesLittle Antietam Creek
Location0.4 MI W of Md RTE 67
RouteCounty Highway 598
Coordinates39.43975, -77.67016
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
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.
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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.4 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length56 ft (17.1 m)
Longest span26 ft (7.9 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,467 (2023)
Projected traffic1,964 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$445,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Millbrook Road over Little Antietam Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Millbrook Road over Little Antietam 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 October 2023.

How much traffic does Millbrook Road over Little Antietam Creek carry?

About 1,467 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Millbrook Road over Little Antietam Creek?

The structure is 56 ft (17.1 m) long with a longest span of 26 ft (7.9 m) and a deck 28 ft wide.

Who owns Millbrook Road over Little Antietam Creek?

It is owned by the County Highway Agency.