US Bridges

Hartley Mill Road over Long Green Creek

Fair

Baltimore County, Maryland · 0.2 MI NW of Harford RD · Structure no. 200000B-0039010

Built
1975
50 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
56 ft
1 main span
Daily traffic
306
2023 count
Owner
County
County Highway Agency

About this bridge

Hartley Mill Road over Long Green Creek is a steel stringer/multi-beam or girder carrying Hartley Mill Road over Long Green Creek in Baltimore County, Maryland. It was built in 1975, so it is 50 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 306 vehicles a day, roughly 5% of them trucks, projected to reach 373 by 2043. The structure is 56 ft (17.1 m) long and 23 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesHartley Mill Road
CrossesLong Green Creek
Location0.2 MI NW of Harford RD
RouteCounty Highway 3886
CountyBaltimore County
StateMaryland
Coordinates39.4507, -76.47539
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68 US tons
Inventory rating40.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length56 ft (17.1 m)
Longest span56 ft (17.1 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic306 (2023)
Projected traffic373 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Hartley Mill Road over Long Green Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Hartley Mill Road over Long Green 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 December 2023.

How much traffic does Hartley Mill Road over Long Green Creek carry?

About 306 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Hartley Mill Road over Long Green Creek?

The structure is 56 ft (17.1 m) long with a longest span of 56 ft (17.1 m) and a deck 23 ft wide.

Who owns Hartley Mill Road over Long Green Creek?

It is owned by the County Highway Agency.