County profile · official public datasets

Harford County, MD

275 public highway bridges tracked in the FHWA National Bridge Inventory: 38.2% rated Good, 57.1% Fair, 4.7% Poor.

275
Public bridges
38.2%
Good condition
4.7%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Harford County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

13th
of 24 on Poor share
4.7%
Poor-condition share
275
public highway bridges
1973
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Harford County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Harford County ranks #13 of 24 Maryland counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.7%). Harford County, Maryland contains 275 public highway bridges. Roughly 38.2% are rated “Good,” 57.1% “Fair,” and 4.7% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

275

Public highway bridges in Harford County

Good condition

38.2%

105 of 275 rated 7-9

Fair condition

57.1%

157 of 275 rated 5-6

Poor condition

4.7%

13 of 275 rated 4 or below

In-state Poor-share rank

#13 of 24

Among Maryland counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 275 NBI-tracked bridges by lowest applicable component rating.

Good
38.2% (105)
Fair
57.1% (157)
Poor
4.7% (13)

Harford County's Poor-condition bridges carry 65,285 vehicle crossings a day

That is 2.5% of the county's reported daily bridge traffic on 4.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 5,022 crossings a day against 6,672 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 275 of 275 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

50.5% of Harford County's bridges have passed the 50-year mark

139 of the 275 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 38.2% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 32.3% of the county's Poor-condition bridge traffic

US 1 over WINTERS RUN, built 1963, carries 21,112 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 13-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 65,285 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Harford County's bridges were built

275 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1960s, when 45 of the county's bridges still in the inventory were built, which is 16.4% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1973) matches the Maryland average (1972).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Harford County compares with Maryland's closest counties by inventory size

The 5 Maryland counties nearest Harford County in number of bridges, with their condition splits. Its 4.7% Poor share is the 3rd-lowest of these 6. Its average build year of 1973 against a peer-group mean of 1969 is in line with the group.

Showing the 5 closest of 23 Maryland counties eligible for comparison.

Bridge inventory size and condition shares for Harford County and the 5 Maryland counties closest to it in inventory size
County Bridges Poor
Howard County 309 5.8%
Washington County 300 4.7%
Harford County (this page) 275 4.7%
Allegany County 245 6.1%
Carroll County 205 5.4%
Cecil County 193 4.1%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Harford County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Harford County, both outside Maryland so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside MD (275 bridges here).

Similar average build year

Nearest mean year-built outside MD (1973 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 275 Good 105 Fair 157 Poor 13

Good-condition bridges (105)

OLD BALTIMORE RD

Good

Over: ROMNEY CREEK

WEST OF LIVE FIRE RD, Harford, MD

Built 2017 ADT: 100

COMBAT DRIVE

Good

Over: UNKNOWN CREEK

N RECONN ST & PISTOL RD, Harford, MD

Built 2017 ADT: 100

US 40

Good

Over: BR OF OTTER POINT CREEK

0.41 MILE EAST OF MD 24, Harford, MD

Built 1994 Load: 29.0 t ADT: 21,614

CARRS MILL ROAD

Good

Over: BEAR CABIN BRANCH

1.7 MILES N OF MD 152, Harford, MD

Built 2018 Load: 31.1 t ADT: 8,142

THOMAS RUN ROAD

Good

Over: THOMAS RUN

0.1 MILES E OF KALMIA RD, Harford, MD

Built 2008 Load: 32.2 t ADT: 1,083

MD 623

Good

Over: PEDDLER RUN

2.03 MILES N OF US 1, Harford, MD

Built 1987 Load: 32.7 t ADT: 1,501

MD 462

Good

Over: SWAN CREEK

0.27 MILE SOUTH OF IS 95, Harford, MD

Built 1978 Load: 32.7 t ADT: 6,501

MD 7

Good

Over: HAHA BRANCH

0.74 MILE NORTH OF MD 24, Harford, MD

Built 1976 Load: 32.7 t ADT: 13,781

MD 623

Good

Over: BR OF SUSQUEHANNA RIV

0.47 MILE NORTH OF MD 161, Harford, MD

Built 1993 Load: 32.7 t ADT: 1,620

LITTLE ROAD

Good

Over: DEEP RUN

0.6 MILES N OF DEEP RUN R, Harford, MD

Built 1980 Load: 32.7 t ADT: 31

I-95

Good

Over: SWAN CREEK

Milepost M86.0, Harford, MD

Built 1963 Load: 32.7 t ADT: 100,386

SANDY HOOK ROAD

Good

Over: DEER CREEK

1.5 MIL NE OF ALLIBONE RD, Harford, MD

Built 1977 Load: 33.6 t ADT: 190

MD 24 NBR

Good

Over: US 40

0.35 MILE NORTH OF MD 755, Harford, MD

Built 1995 Load: 35.8 t ADT: 20,242

SOUTHAMPTON ROAD

Good

Over: BYNUM RUN

0.6 MILES W OF MD 543, Harford, MD

Built 2010 Load: 36.7 t ADT: 3,876

I-95

Good

Over: CARSINS RUN

Milepost M85.6, Harford, MD

Built 1963 Load: 36.7 t ADT: 100,386

OLD JOPPA ROAD

Good

Over: I-95

Milepost M73.4, Harford, MD

Built 2019 Load: 36.9 t ADT: 28,266

ALDINO-STEPNEY RD

Good

Over: CARSINS RUN

0.5 MILES N OF MD 22, Harford, MD

Built 2000 Load: 37.2 t ADT: 439

MD 23

Good

Over: MORSE ROAD

1.03 MILES S OF MD 165, Harford, MD

Built 1961 Load: 37.6 t ADT: 11,892

MD 152

Good

Over: CSX TRANSPORTATION

0.25 MILE NORTH OF US 40, Harford, MD

Built 1971 Load: 38.1 t ADT: 24,672

GREEN ROAD

Good

Over: TRIB / DEER CREEK

0.05 M W OF LONG CORNER R, Harford, MD

Built 2019 Load: 38.9 t ADT: 148

MD 161

Good

Over: DEER CREEK

2.11 MILES S OF MD 623, Harford, MD

Built 1995 Load: 39.0 t ADT: 5,291

GREEN ROAD

Good

Over: TRIB / DEER CREEK

0.2 M W OF LONG CORNER RD, Harford, MD

Built 2019 Load: 39.2 t ADT: 510

WINTERS RUN ROAD

Good

Over: MOUNTAIN BRANCH

0.05 MILES S OF SINGER RD, Harford, MD

Built 1972 Load: 39.5 t ADT: 585

MD 152

Good

Over: AMTRAK

2.20 MILES SOUTH OF US 40, Harford, MD

Built 1994 Load: 40.4 t ADT: 102

TROYER ROAD

Good

Over: TRIB / LITTLE DEER CREEK

1.5 MILES NE OF MD 23, Harford, MD

Built 2023 Load: 40.5 t ADT: 335

MD 543

Good

Over: US 40 CSX RAILROAD

1.17 MILES SOUTH OF MD 7, Harford, MD

Built 1995 Load: 40.8 t ADT: 17,981

HEAPS ROAD

Good

Over: JANE CARRS RUN

0.7 MILES SW OF MD 136, Harford, MD

Built 1996 Load: 40.8 t ADT: 303

LAPIDUM ROAD

Good

Over: I-95

Milepost M89.7, Harford, MD

Built 1963 Load: 40.8 t ADT: 515

STAFFORD ROAD

Good

Over: DEER CREEK

0.03 MI N OF CRAIGS CR RD, Harford, MD

Built 1951 Load: 42.4 t ADT: 469

NEW PARK ROAD

Good

Over: ISLAND BRANCH

0.78 MI. NE OF ROUTE 23, Harford, MD

Built 2019 Load: 42.4 t ADT: 395

FOUR SEASONS DRIVE

Good

Over: TRIBUTARY TO HA HA BRANC

0.03 MILES W OF MD 7, Harford, MD

Built 2005 Load: 43.1 t ADT: 595

MD 24 NB

Good

Over: OTTERS POINT CREEK

0.1 MILE NORTH OF US 40, Harford, MD

Built 1996 Load: 43.5 t ADT: 20,242

MD 165

Good

Over: BR OF WEST BRANCH

0.97 MILE NORTH OF MD 152, Harford, MD

Built 2004 Load: 43.5 t ADT: 7,471

SUSQUEHANNA HALL R

Good

Over: DEEP RUN

0.7 MILES S OF MD 623, Harford, MD

Built 1973 Load: 43.5 t ADT: 101

MD 7

Good

Over: CSX TRANS.

0.34 MILE SOUTH OF US 40, Harford, MD

Built 1993 Load: 44.0 t ADT: 12,210

MARDIC DRIVE

Good

Over: BYNUM RUN

0.05 MI N OF SPENCEOLA PK, Harford, MD

Built 1998 Load: 44.0 t ADT: 114

MAXA ROAD

Good

Over: I-95

Milepost M85.6, Harford, MD

Built 1963 Load: 44.4 t ADT: 1,239

FURNACE ROAD

Good

Over: WEST BRANCH/WINTERS RUN

0.6 MILES E OF MD 152, Harford, MD

Built 1996 Load: 44.7 t ADT: 1,550

MD 24

Good

Over: CSX RAILROAD

0.3 MILE SOUTH OF MD 7, Harford, MD

Built 1995 Load: 44.9 t ADT: 20,242

CLAYTON ROAD

Good

Over: I-95

Milepost M75.0, Harford, MD

Built 2022 Load: 45.0 t ADT: 1,212

ROBINSON MILL ROAD

Good

Over: BROAD CREEK

0.5 MILES E OF MD 136, Harford, MD

Built 2020 Load: 45.4 t ADT: 73

NORTH AVENUE

Good

Over: BYNUM RUN

0.2 MILES EAST OF MD 924, Harford, MD

Built 2011 Load: 45.4 t ADT: 714

MD 159

Good

Over: CRANBERRY RUN

0.22 MILE SOUTH OF US 40, Harford, MD

Built 2008 Load: 45.8 t ADT: 4,980

HOLLY OAK CIRCLE

Good

Over: GRAYS RUN

0.1 MILES N OF MD 7, Harford, MD

Built 1999 Load: 45.8 t ADT: 173

NEAL ROAD

Good

Over: BIG BRANCH

0.3 MILE E OF ST PAULS RD, Harford, MD

Built 1950 Load: 47.2 t ADT: 60

WHEEL ROAD

Good

Over: BYNUM RUN

1.2 MILES NE OF MD 924, Harford, MD

Built 1996 Load: 47.6 t ADT: 6,075

MACTON ROAD

Good

Over: BROAD CREEK

1.4 MILES SW OF MD 136, Harford, MD

Built 1955 Load: 47.6 t ADT: 162

MOORES MILL ROAD

Good

Over: BYNUM RUN

0.3 MILES NW OF MD 22, Harford, MD

Built 2005 Load: 48.5 t ADT: 9,615

COSNER ROAD

Good

Over: EAST BRANCH/WINTERS RUN

0.3 MI E OF PHILLIPS M RD, Harford, MD

Built 1991 Load: 49.0 t ADT: 81

SOUTH TOLLGATE ROA

Good

Over: PLUMTREE RUN

0.38 MI. N. PLUMTREE RD., Harford, MD

Built 2019 Load: 49.0 t ADT: 225

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.