US Bridges

Hoffman Mill Road over East Branch Patapsco Riv

Fair

Carroll County, Maryland · 1 MI W of Houcksville Rd. · Structure no. 200000CL0375020

Built
1991
34 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete
Length
32 ft
Daily traffic
751
2021 count
Owner
County
County Highway Agency

About this bridge

Hoffman Mill Road over East Branch Patapsco Riv is a concrete culvert carrying Hoffman Mill Road over East Branch Patapsco Riv in Carroll County, Maryland. It was built in 1991, so it is 34 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.

It carries about 751 vehicles a day, roughly 8% of them trucks, projected to reach 1,240 by 2041. The structure is 32 ft (9.8 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesHoffman Mill Road
CrossesEast Branch Patapsco Riv
Location1 MI W of Houcksville Rd.
RouteCounty Highway 447
CountyCarroll County
StateMaryland
Coordinates39.58934, -76.88235
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, precast panels
Main spans0
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span15 ft (4.6 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic751 (2021)
Projected traffic1,240 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo
Strategic Highway NetworkInterstate STRAHNET route

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 Hoffman Mill Road over East Branch Patapsco Riv built?

It was built in 1991, making it 34 years old in 2025.

What condition is Hoffman Mill Road over East Branch Patapsco Riv 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 July 2023.

How much traffic does Hoffman Mill Road over East Branch Patapsco Riv carry?

About 751 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Hoffman Mill Road over East Branch Patapsco Riv?

The structure is 32 ft (9.8 m) long with a longest span of 15 ft (4.6 m) and a deck 30 ft wide.

Who owns Hoffman Mill Road over East Branch Patapsco Riv?

It is owned by the County Highway Agency.