Total bridges
275
Public highway bridges in Harford County
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.
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
- pre-1900 1
Built before 1900
1 bridges
- 1900s 3
1900–1909
3 bridges
- 1910s 3
1910–1919
3 bridges
- 1920s 7
1920–1929
7 bridges
- 1930s
1930–1939
31 bridges
- 1940s 5
1940–1949
5 bridges
- 1950s
1950–1959
24 bridges
- 1960s
1960–1969
45 bridges
- 1970s
1970–1979
40 bridges
- 1980s
1980–1989
31 bridges
- 1990s
1990–1999
38 bridges
- 2000s
2000–2009
21 bridges
- 2010s
2010–2019
20 bridges
- 2020s 6
2020–2029
6 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).
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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Howard County | 309 | 35.9% | 58.3% | 5.8% | 1978 |
| Washington County | 300 | 28.3% | 67% | 4.7% | 1956 |
| Harford County (this page) | 275 | 38.2% | 57.1% | 4.7% | 1973 |
| Allegany County | 245 | 36.7% | 57.1% | 6.1% | 1971 |
| Carroll County | 205 | 28.3% | 66.3% | 5.4% | 1968 |
| Cecil County | 193 | 32.1% | 63.7% | 4.1% | 1972 |
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).
- Walker County, AL · 275 bridges
- Ellis County, KS · 275 bridges
- Seneca County, OH · 275 bridges
- Lyon County, IA · 276 bridges
Similar average build year
Nearest mean year-built outside MD (1973 here).
- Jefferson County, AL · avg 1973 · 1,068 bridges
- Erie County, NY · avg 1973 · 906 bridges
- Davidson County, TN · avg 1973 · 832 bridges
- Lancaster County, PA · avg 1973 · 801 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (157)
MD 132B
FairOver: AMTRAK
0.03 MILE SOUTH OF US 40, Harford, MD
Built 1943 Load: 33.6 t ADT: 3,563
FALLING BRANCH RD
FairOver: FALLING BRANCH
0.7 MI NE OF RED BRIDGE R, Harford, MD
Built 1973 Load: 34.0 t ADT: 25
ROCK RUN ROAD
FairOver: ROCK RUN
0.01 MI E OF WILKINSON RD, Harford, MD
Built 1955 Load: 34.5 t ADT: 154
TAYLOR ROAD
FairOver: BROAD CREEK
0.7 MILES E OF MD 543, Harford, MD
Built 1974 Load: 34.9 t ADT: 44
CARSINS RUN ROAD
FairOver: CARSINS RUN
0.03 MILES N OF MD 22, Harford, MD
Built 1972 Load: 35.4 t ADT: 655
MD 7
FairOver: BYNUM RUN
0.17 MILE SOUTH OF MD 136, Harford, MD
Built 1923 Load: 35.8 t ADT: 11,350
MD 132B
FairOver: SWAN CREEK
0.33 MILE SOUTH OF US 40, Harford, MD
Built 1930 Load: 35.8 t ADT: 4,030
VALE ROAD
FairOver: US 1
@ US 1, Harford, MD
Built 1963 Load: 35.8 t ADT: 2,254
MD 24
FairOver: DEER CREEK
2.17 MILES S OF MD 165, Harford, MD
Built 1934 Load: 36.3 t ADT: 3,930
SPESUTIA ROAD
FairOver: CRANBERRY RUN
0.2 MILES N OF MD 159, Harford, MD
Built 1966 Load: 36.3 t ADT: 4,242
MD 24 NB
FairOver: I-95
I-95 Milepost 76.4, Harford, MD
Built 1987 Load: 36.3 t ADT: 73,058
CHAPEL ROAD
FairOver: I-95
Milepost 87.8, Harford, MD
Built 1963 Load: 36.3 t ADT: 2,816
PALMER ROAD
FairOver: ROMNEY CREEK
80 YDS W OF OLD BALTIMORE, Harford, MD
Built 1942 Load: 36.3 t ADT: 100
MD 24
FairOver: BR OF DEER CREEK
0.42 M S OF DAVIS ROAD, Harford, MD
Built 1986 Load: 37.6 t ADT: 3,193
RED BRIDGE ROAD
FairOver: FALLING BRANCH
0.3 MILES E OF FAWN GR RD, Harford, MD
Built 1975 Load: 37.6 t ADT: 113
PROSPECT ROAD
FairOver: DEEP CREEK
1.1 MILES N OF MD 136, Harford, MD
Built 1950 Load: 37.6 t ADT: 575
LEWIS LANE
FairOver: AMTRAK RAILROAD
0.1 MILES E OF US 40, Harford, MD
Built 1980 Load: 37.6 t ADT: 5,745
MD 165
FairOver: LITTLE DEER CREEK
2.35 MILES SOUTH OF MD 24, Harford, MD
Built 1930 Load: 38.5 t ADT: 6,673
BYNUM ROAD
FairOver: BYNUM RUN
0.5 MILES NE OF MD 24, Harford, MD
Built 1976 Load: 38.5 t ADT: 4,310
POTEET ROAD
FairOver: EAST BRANCH/WINTERS RUN
0.01 M W OF PHILLIPS M RD, Harford, MD
Built 1995 Load: 38.5 t ADT: 35
MD 543
FairOver: IS 95
0.23 MILE NORTH OF MD 7, Harford, MD
Built 1991 Load: 39.0 t ADT: 18,391
US 40
FairOver: BUSH CREEK
3.24 MILES EAST OF MD 24, Harford, MD
Built 1935 Load: 39.5 t ADT: 21,093
HEAPS ROAD
FairOver: BROAD CREEK
0.5 MILES NE OF MD 543, Harford, MD
Built 1979 Load: 40.4 t ADT: 529
MD 24 SB
FairOver: I-95
I-95 Milepost M76.4, Harford, MD
Built 1963 Load: 40.4 t ADT: 73,058
US 40
FairOver: OTTER POINT CREEK
0.10 MILE EAST OF MD 24, Harford, MD
Built 1935 Load: 40.8 t ADT: 21,093
MD 24 SBR
FairOver: CSX TRANS.
0.3 MILE SOUTH OF MD 7, Harford, MD
Built 1970 Load: 40.8 t ADT: 20,242
MD 24
FairOver: TRIB. TO OTTER POINT CRE
0.13 MILE NORTH OF MD 755, Harford, MD
Built 1969 Load: 40.8 t ADT: 24,240
MD 22
FairOver: AMTRAK TRIB TO SWAN CR
0.06 MILE EAST OF US 40, Harford, MD
Built 1968 Load: 41.3 t ADT: 22,420
I-95
FairOver: WINTERS RUN RD WINTERS R
3.2 MI N BALT-HAR CO LINE, Harford, MD
Built 1963 Load: 41.3 t ADT: 161,591
US 40 & RMPS 5 & 6
FairOver: BR OF SWAN CREEK
0.03 MILE SOUTH OF MD 22, Harford, MD
Built 1968 Load: 41.7 t ADT: 26,751
ST CLAIR BRIDGE RD
FairOver: DEER CREEK
1.0 MILES S OF MD 165, Harford, MD
Built 1954 Load: 41.7 t ADT: 563
EDGEWOOD ROAD
FairOver: OTTER POINT CREEK (N)
0.3 MILES S OF MD 7, Harford, MD
Built 1933 Load: 41.7 t ADT: 9,886
MD 136
FairOver: I-95
Milepost M79.0, Harford, MD
Built 1963 Load: 42.6 t ADT: 7,656
TOLLGATE ROAD
FairOver: HEAVENLY WATERS
0.6 MILES W OF BUS US 1, Harford, MD
Built 2000 Load: 43.1 t ADT: 8,025
EDGEWOOD ROAD
FairOver: OTTER POINT CREEK (S)
0.4 MILES S OF MD 7, Harford, MD
Built 1987 Load: 43.1 t ADT: 9,554
US 40
FairOver: CRANBERRY RUN
0.32 MILE EAST OF MD 159, Harford, MD
Built 1935 Load: 43.5 t ADT: 34,600
MD 22
FairOver: US 40
0.39 MILE WEST OF MD 132B, Harford, MD
Built 1968 Load: 43.5 t ADT: 17,370
GREEN ROAD
FairOver: TRIB OF DEER CREEK
0.02 M E OF LONG CORNER R, Harford, MD
Built 1999 Load: 44.4 t ADT: 170
MD 165
FairOver: WEST BRANCH
1.03 MILES N OF MD 152, Harford, MD
Built 2004 Load: 44.9 t ADT: 7,471
EARLTON ROAD
FairOver: I-95
Milepost M88.4, Harford, MD
Built 1963 Load: 44.9 t ADT: 829
MACPHAIL ROAD
FairOver: BYNUM RUN
1.6 MILES E OF MD 924, Harford, MD
Built 1974 Load: 45.4 t ADT: 3,095
BRIDGE DRIVE
FairOver: JOPPATOWNE CANAL
0.05 MI S OF TOWNE CNT DR, Harford, MD
Built 1975 Load: 45.4 t ADT: 1,342
MD 136
FairOver: BIG BRANCH
2.64 MILES NORTH OF MD 24, Harford, MD
Built 1934 Load: 46.7 t ADT: 2,420
MD 24
FairOver: AMTRAK SIBERT RD
1.66 MILES S OF MD 755, Harford, MD
Built 1974 Load: 46.7 t ADT: 16,092
MORSE ROAD
FairOver: EAST BRANCH/WINTERS RUN
0.3 MILES NE OF MD 23, Harford, MD
Built 1997 Load: 46.7 t ADT: 1,045
MD 462
FairOver: CARSINS RUN
0.66 MILE NORTH OF MD 22, Harford, MD
Built 1978 Load: 47.2 t ADT: 6,960
WEST HEAPS ROAD
FairOver: BIG BRANCH
0.5 MILES N OF MD 136, Harford, MD
Built 1990 Load: 47.2 t ADT: 37
WHITAKER MILL ROAD
FairOver: HIGH BRIDGE BRANCH
1.4 MILES E OF US 1, Harford, MD
Built 1998 Load: 47.6 t ADT: 1,325
I-95 NB
FairOver: BYNUM RUN
Milepost M79.1, Harford, MD
Built 1963 Load: 47.6 t ADT: 63,977
MD 22
FairOver: CSX TRANS.
0.06 MILE WEST OF US 40, Harford, MD
Built 1968 Load: 48.1 t ADT: 25,940
Read our methodology - how this data is sourced, computed, and verified.
Related
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.