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)

COOLEY MILL ROAD

Good

Over: ROCK RUN

0.7 MI SE OF ROCK RUN RD, Harford, MD

Built 1997 Load: 49.4 t ADT: 200

CHESTNUT HILL ROAD

Good

Over: STOUT BOTTLE BRANCH

0.6 MILES NW OF MD 543, Harford, MD

Built 2020 Load: 49.9 t ADT: 681

TURNER ROAD

Good

Over: TRIB / L GUNPOWDER FALLS

0.4 MILES N OF POCOCK RD, Harford, MD

Built 2003 Load: 50.3 t ADT: 101

BAILEY ROAD

Good

Over: SOUTH STIRRUP RUN

0.5 MI E OF SHARON ACR RD, Harford, MD

Built 1953 Load: 50.3 t ADT: 155

GREENE ROAD

Good

Over: SAW MILL BRANCH

0.3 MILES NE OF BALT CO, Harford, MD

Built 1952 Load: 50.8 t ADT: 616

GLEN COVE ROAD

Good

Over: PEDDLER RUN

1.4 MI NE MD 136, Harford, MD

Built 1930 Load: 50.9 t ADT: 890

MANDEVILLE ROAD

Good

Over: TRIBUTARY TO LITTLE GUNP

0.3 MILES N OF MD 7, Harford, MD

Built 1985 Load: 51.2 t ADT: 101

HARMONY CHURCH RD

Good

Over: MILL BROOK

1.4 MILES E OF MD 136, Harford, MD

Built 1933 Load: 52.6 t ADT: 133

GILBERT ROAD

Good

Over: CARSINS RUN

0.5 MILES N MD 22, Harford, MD

Built 1960 Load: 53.1 t ADT: 1,000

MD 22

Good

Over: I-95

Milepost M84.9, Harford, MD

Built 2003 Load: 54.9 t ADT: 28,033

PHILLIPS MILL ROAD

Good

Over: EAST BRANCH/ WINTERS RUN

0.6 MILES W OF MD 23, Harford, MD

Built 2020 Load: 55.1 t ADT: 434

RYAN ROAD

Good

Over: BREAD AND CHEESE BRANCH

1.1 MILES NORTH OF MD 152, Harford, MD

Built 2008 Load: 55.3 t ADT: 1,530

MD 136

Good

Over: JAMES RUN

1.6 MILES NORTH OF MD 543, Harford, MD

Built 2006 Load: 56.2 t ADT: 6,361

SNAKE LANE

Good

Over: JAMES RUN

0.21 MI E OF MD 136, Harford, MD

Built 2019 Load: 56.7 t ADT: 529

PENNINGTON ROAD

Good

Over: THOMAS RUN

0.2 MILE E OF THOMAS R RD, Harford, MD

Built 1975 Load: 57.6 t ADT: 249

OLD SOUTHAMPTON RO

Good

Over: BYNUM RUN

0.6 MILES S OF MD 543, Harford, MD

Built 1930 Load: 57.6 t ADT: 51

BOTTOM ROAD

Good

Over: OVERSHOT BRANCH

0.03 MILES N OF GUYTON RD, Harford, MD

Built 1978 Load: 58.0 t ADT: 300

SINGER ROAD

Good

Over: MOUNTAIN BRANCH

1.7 MILES E OF MD 152, Harford, MD

Built 2003 Load: 58.5 t ADT: 4,530

DRY BRANCH ROAD

Good

Over: TRIB / DEER CREEK

0.4 MILES W OF MD 23, Harford, MD

Built 1999 Load: 58.5 t ADT: 82

CEDARDAY DRIVE

Good

Over: TRIBUTARY TO BYNUM RUN

1.0 MILES E OF CEDAR LANE, Harford, MD

Built 2005 Load: 59.9 t ADT: 221

OAK VALLEY DRIVE

Good

Over: TRIB / PLUMTREE RUN

0.3 MILES S OF W RIDING D, Harford, MD

Built 2005 Load: 59.9 t ADT: 55

MADONNA ROAD

Good

Over: CATTAIL BRANCH

0.4 MILE S OF MT HOREB RD, Harford, MD

Built 1992 Load: 60.3 t ADT: 789

EDEN MILL ROAD

Good

Over: BIG BRANCH

0.4 MILES W OF FAWN GR RD, Harford, MD

Built 1961 Load: 60.9 t ADT: 177

MD 623

Good

Over: BROAD CREEK

2.63 MI S OF PA LINE, Harford, MD

Built 1998 Load: 63.5 t ADT: 1,120

SCHUCKS PARK ROAD

Good

Over: BROAD RUN

0.2 MI. E. OF SCHUCKS RD, Harford, MD

Built 2012 Load: 63.9 t ADT: 306

HARFORD CREAMERY R

Good

Over: TRIB / LITTLE DEER CREEK

0.5 MILES N OF LEMON RD, Harford, MD

Built 2015 Load: 64.2 t ADT: 500

SCHUSTER ROAD

Good

Over: WEST BRANCH/ WINTERS RUN

0.2 MILES E OF MD 146, Harford, MD

Built 1999 Load: 64.9 t ADT: 4,200

RIDGE ROAD

Good

Over: BROAD CREEK

2.2 MILES SW OF MD 136, Harford, MD

Built 1979 Load: 65.3 t ADT: 169

RUFFS MILL ROAD

Good

Over: TRIB / THOMAS RUN

0.8 MILES SE OF US 1, Harford, MD

Built 2011 Load: 65.8 t ADT: 1,007

FAWN GROVE ROAD

Good

Over: DEER CREEK

0.8 MILES N OF MD 165, Harford, MD

Built 1978 Load: 66.7 t ADT: 978

MACTON ROAD

Good

Over: TRIB / BROAD CREEK

0.31 MI SW OF MD 136, Harford, MD

Built 2014 Load: 67.6 t ADT: 212

OAKINGTON ROAD

Good

Over: GASHEYS CREEK

0.8 MILES S OF MD 132, Harford, MD

Built 1993 Load: 67.6 t ADT: 1,330

CARRS MILL ROAD

Good

Over: WINTERS RUN

1.4 MILES N OF MD 152, Harford, MD

Built 1991 Load: 68.5 t ADT: 8,285

WEST CHAPEL ROAD

Good

Over: SWAN CREEK

0.6 MILES S OF MD 156, Harford, MD

Built 1930 Load: 69.7 t ADT: 365

DURHAM ROAD

Good

Over: WEST BRANCH and WINTERS

0.01 MI E OF CHARLES ST, Harford, MD

Built 1995 Load: 69.8 t ADT: 1,770

CLOVERFIELD DRIVE

Good

Over: TRIBUTARY OF BYNUM RUN

0.1 MI. E. of Tyrell Ct, Harford, MD

Built 2023 Load: 71.6 t ADT: 250

MD 7

Good

Over: JAMES RUN

0.28 MILE NORTH OF MD 136, Harford, MD

Built 2014 Load: 73.9 t ADT: 12,500

BRIERHILL DRIVE

Good

Over: BYNUM RUN

0.4 MILES S OF MD 22, Harford, MD

Built 1987 Load: 75.3 t ADT: 9,278

MD 7

Good

Over: WINTERS RUN

0.33 M S OF EDGEWOOD ROAD, Harford, MD

Built 1991 Load: 84.8 t ADT: 7,300

MT HOREB ROAD

Good

Over: LITTLE DEER CREEK

1.2 MILES NW OF MD 165, Harford, MD

Built 1955 Load: 85.7 t ADT: 751

MD 24

Good

Over: MD 924

0.53 MI NORTH OF I-95, Harford, MD

Built 2011 Load: 87.5 t ADT: 72,060

BEAR CREEK DRIVE

Good

Over: BEAR CABIN BRANCH

0.2 MI N OF BERNADETTE DR, Harford, MD

Built 1980 Load: 90.2 t ADT: 1,111

WATERVALE ROAD

Good

Over: WINTERS RUN

1.7 MILES N OF MD 152, Harford, MD

Built 2016 Load: 96.9 t ADT: 2,479

GLEN COVE ROAD

Good

Over: PEDDLER RUN

1.90 MI. E OF DUBLIN, Harford, MD

Built 2019 Load: 97.2 t ADT: 481

MD 24

Good

Over: BR OF DEER CREEK

0.29 M S OF COEN ROAD, Harford, MD

Built 1986 Load: 99.9 t ADT: 3,193

MD 24 & 24E

Good

Over: HEAVENLY WATERS

0.19 MI S OF US 1, Harford, MD

Built 1987 Load: 99.9 t ADT: 23,140

MD 24

Good

Over: PED. AND HORSE TUNNEL

0.45 MILE NORTH OF US 1BU, Harford, MD

Built 1987 Load: 99.9 t ADT: 21,480

JAMES RUN ROAD

Good

Over: BROAD RUN

0.3 MILES E OF MD 136, Harford, MD

Built 1960 Load: 99.9 t ADT: 1,265

JOPPA FARM ROAD

Good

Over: FOSTER BRANCH

1.9 MILES E OF US 40, Harford, MD

Built 1997 Load: 99.9 t ADT: 15,650

WAGNER WAY

Good

Over: BYNUM RUN

0.2 MILES E OF MD 24, Harford, MD

Built 2001 Load: 99.9 t ADT: 732

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.