County profile · official public datasets

Allegany County, MD

245 public highway bridges tracked in the FHWA National Bridge Inventory: 36.7% rated Good, 57.1% Fair, 6.1% Poor.

245
Public bridges
36.7%
Good condition
6.1%
Poor condition

The verdict

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

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

18th
of 24 on Poor share
6.1%
Poor-condition share
245
public highway bridges
1971
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.

Allegany County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Allegany County ranks #18 of 24 Maryland counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.1%). Allegany County, Maryland contains 245 public highway bridges. Roughly 36.7% are rated “Good,” 57.1% “Fair,” and 6.1% “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

245

Public highway bridges in Allegany County

Good condition

36.7%

90 of 245 rated 7-9

Fair condition

57.1%

140 of 245 rated 5-6

Poor condition

6.1%

15 of 245 rated 4 or below

In-state Poor-share rank

#18 of 24

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

Condition distribution

Share of 245 NBI-tracked bridges by lowest applicable component rating.

Good
36.7% (90)
Fair
57.1% (140)
Poor
6.1% (15)

Allegany County's Poor-condition bridges carry 26,811 vehicle crossings a day

That is 1.6% of the county's reported daily bridge traffic on 6.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,787 crossings a day against 4,710 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 245 of 245 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

51% of Allegany County's bridges have passed the 50-year mark

125 of the 245 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 36.7% 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 43.9% of the county's Poor-condition bridge traffic

BALTIMORE STREET over WILLS CREEK, built 1916, carries 11,780 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 15-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 26,811 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Allegany County's bridges were built

245 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1990s, when 58 of the county's bridges still in the inventory were built, which is 23.7% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1971) matches the Maryland average (1972).

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

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

The 5 Maryland counties nearest Allegany County in number of bridges, with their condition splits. Its 6.1% Poor share is the 6th-lowest of these 6. Its average build year of 1971 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 Allegany 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 275 4.7%
Allegany County (this page) 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 Allegany 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 Allegany County, both outside Maryland so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside MD (245 bridges here).

Similar average build year

Nearest mean year-built outside MD (1971 here).

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

All 245 Good 90 Fair 140 Poor 15

Good-condition bridges (90)

WELSH HILL ROAD

Good

Over: GEORGES CREEK

0.14 MI N OF MD 936, Allegany, MD

Built 1999 Load: 19.0 t ADT: 1,113

MD 831A

Good

Over: BRADDOCK RUN

0.06 MI N OF US 40AL, Allegany, MD

Built 1900 Load: 30.8 t ADT: 599

LAUREL RUN ROAD

Good

Over: LAUREL RUN

0.35 MI W OF MD RTE 935, Allegany, MD

Built 2021 Load: 32.4 t ADT: 97

MD 638

Good

Over: WESTERN MD SCENIC RR

0.02 M N OF SONGBIRD LANE, Allegany, MD

Built 1995 Load: 32.7 t ADT: 1,621

LAUREL RUN ROAD

Good

Over: LAUREL RUN

0.41 MI W OF MD RTE 935, Allegany, MD

Built 2020 Load: 32.7 t ADT: 93

LAUREL RUN ROAD

Good

Over: LAUREL RUN

0.75 MI W OF MD RTE 935, Allegany, MD

Built 2020 Load: 32.7 t ADT: 98

SUGAR MAPLE ROAD

Good

Over: UNNAMED STREAM

0.04 MI N OF MD 36, Allegany, MD

Built 1950 Load: 32.7 t ADT: 337

TOWN CREEK ROAD

Good

Over: MURLEY BRANCH

0.02 MI SW OF WARM SPR RD, Allegany, MD

Built 2020 Load: 32.7 t ADT: 301

RIVER ROAD

Good

Over: C&O CANAL

0.19 MI S OF PPG RD, Allegany, MD

Built 2014 Load: 33.0 t ADT: 105

KREIGBAUM ROAD

Good

Over: JENNINGS RUN

0.04 MI W OF MD 36, Allegany, MD

Built 2021 Load: 34.3 t ADT: 699

ORLEANS ROAD

Good

Over: FIFTEEN MILE CREEK

0.01 MI. E. OF APPEL RD, Allegany, MD

Built 2019 Load: 35.3 t ADT: 297

MD 36

Good

Over: BRANCH OF GEORGES CREEK

0.21 MILE NORTH OF MD 939, Allegany, MD

Built 1981 Load: 35.4 t ADT: 5,740

IS 68 EBR

Good

Over: MD 144 ELK LICK RUN

0.86 M E OF BR NO 0115500, Allegany, MD

Built 1990 Load: 35.8 t ADT: 21,600

POTOMAC HOLLOW ROA

Good

Over: MOORES RUN

0.48 MI S OF MD 935, Allegany, MD

Built 2014 Load: 36.0 t ADT: 268

MD 47

Good

Over: NORTH BRANCH

0.518 MI N OF MD 831F, Allegany, MD

Built 2005 Load: 36.7 t ADT: 2,042

MD 35

Good

Over: BRANCH OF WILLS CREEK

0.17 MI S OF PA LINE, Allegany, MD

Built 2008 Load: 37.6 t ADT: 5,001

IS 68 WBR

Good

Over: MD 144 ELK LICK RUN

0.86 M E OF BR NO 0115500, Allegany, MD

Built 1990 Load: 38.1 t ADT: 21,600

MD 51

Good

Over: EVITTS CREEK

0.14 MI E OF CUMBERLAND, Allegany, MD

Built 1957 Load: 38.5 t ADT: 12,092

TENSOR LANE

Good

Over: IS 68

AT IS 68, Allegany, MD

Built 1990 Load: 38.5 t ADT: 50

FIFTEEN MILE CREEK

Good

Over: WHITE SULPHUR RUN

1.64 MILES S OF US 40, Allegany, MD

Built 1935 Load: 39.0 t ADT: 1,218

BARTLETT RUN ROAD

Good

Over: BUTCHERS RUN

0.16 MI W OF MD 36, Allegany, MD

Built 2007 Load: 39.5 t ADT: 970

MD 36

Good

Over: GEORGES CREEK

1.70 MI N OF MD 935, Allegany, MD

Built 2010 Load: 40.4 t ADT: 7,706

RIVER ROAD

Good

Over: C&O CANAL

0.1 miles from North Bran, Allegany, MD

Built 2015 Load: 40.8 t ADT: 100

MD 47

Good

Over: NORTH BRANCH

0.23 MI N OF MD 36, Allegany, MD

Built 2016 Load: 41.1 t ADT: 2,300

MD 61 (CANAL PKWY)

Good

Over: C & O CANAL

0.13 MILE N OF W VA LINE, Allegany, MD

Built 1997 Load: 41.7 t ADT: 11,501

US 40 SCN

Good

Over: IS 68 & SNIB HOLLOW RUN

0.03 M E OD MANN ROAD, Allegany, MD

Built 1988 Load: 42.2 t ADT: 281

IS 68 EBR

Good

Over: TOWN CREEK

0.24 M E OF BR NO 0114000, Allegany, MD

Built 1990 Load: 42.2 t ADT: 18,551

IS 68 WBR

Good

Over: TOWN CREEK

0.24 M E OF BR NO 0114000, Allegany, MD

Built 1990 Load: 42.2 t ADT: 18,551

MOUNTAIN ROAD

Good

Over: IS 68

AT IS 68, Allegany, MD

Built 1968 Load: 43.1 t ADT: 999

US 40 SCN

Good

Over: IS 68

0.59 MI E OF MD 144, Allegany, MD

Built 1990 Load: 43.5 t ADT: 284

GEORGES CREEK ROAD

Good

Over: NEFF RUN

AT CHURCH STREET, Allegany, MD

Built 2007 Load: 44.0 t ADT: 1,575

MD 36

Good

Over: KOONTZ RUN

0.05 MILE NORTH OF MD 657, Allegany, MD

Built 2011 Load: 45.0 t ADT: 8,275

IS 68 RAMP FT-2

Good

Over: FIFTEENMILE CREEK

RP 2 IS 68 WB TO US 40SC, Allegany, MD

Built 1990 Load: 45.4 t ADT: 9,992

CHURCH STREET

Good

Over: GEORGES CREEK

0.06 MI W OF MD 936, Allegany, MD

Built 2000 Load: 45.4 t ADT: 461

MD 144

Good

Over: IS 68

0.16 MILE EAST OF US 220, Allegany, MD

Built 1990 Load: 45.8 t ADT: 1,121

CEDAR KNOLL LANE

Good

Over: ELK LICK RUN

100 FEET SOUTH OF MD 144, Allegany, MD

Built 1966 Load: 46.3 t ADT: 50

CHRISTIE ROAD

Good

Over: EVITTS CREEK

1.04 MILES S OF MD 144AN, Allegany, MD

Built 1975 Load: 46.3 t ADT: 1,464

US 220

Good

Over: I-68 AND MD 144 RAMP

INTERSECTION WITH IS 68, Allegany, MD

Built 1999 Load: 46.7 t ADT: 3,841

MASON ROAD

Good

Over: PEA VINE RUN

0.06 MI N OF ZEMBOWER RD, Allegany, MD

Built 2004 Load: 46.7 t ADT: 1,275

MD 948Y

Good

Over: IS 68

0.3 MI W OF WASHINGTON CO, Allegany, MD

Built 1988 Load: 47.2 t ADT: 99

MD 144

Good

Over: IS 68 PRATT HOLLOW

0.61 MI W OF US 40 SCN, Allegany, MD

Built 1990 Load: 47.2 t ADT: 1,121

MD 36

Good

Over: ELKLICK RUN

0.73 M S OF BR NO 0112700, Allegany, MD

Built 2007 Load: 47.6 t ADT: 7,706

MD 36

Good

Over: GEORGES CREEK

0.10 MILE SOUTH OF MD 937, Allegany, MD

Built 1975 Load: 47.6 t ADT: 4,720

ISLAND STREET

Good

Over: JACKSON RUN

0.03 MI W OF RAILROAD AVE, Allegany, MD

Built 1940 Load: 49.0 t ADT: 337

MD 135

Good

Over: GEORGES CREEK

0.02 MI E OF MD 36, Allegany, MD

Built 1963 Load: 49.9 t ADT: 6,642

US 220

Good

Over: PEA VINE RUN & BEALS MIL

1063 MILES NORTH OF IS 68, Allegany, MD

Built 1999 Load: 50.3 t ADT: 3,841

IS 68

Good

Over: US 40 ALT/MD 639

0.92 MILE WEST OF MD 952, Allegany, MD

Built 2019 Load: 53.1 t ADT: 27,462

MD 935

Good

Over: GEORGES CREEK

0.26 MI N OF MD 35A, Allegany, MD

Built 2004 Load: 53.5 t ADT: 1,430

MD 36

Good

Over: JENNINGS RUN

1.38 MI S OF MD 47, Allegany, MD

Built 1995 Load: 54.9 t ADT: 2,290

IS 68 EBR

Good

Over: DRY RIDGE ROAD

2.6 MI W OLD CUMBERL RD, Allegany, MD

Built 1990 Load: 55.3 t ADT: 18,551

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.