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)

IS 68 WBR

Good

Over: DRY RIDGE ROAD

2.6 MI W OLD CUMBERL RD, Allegany, MD

Built 1990 Load: 55.3 t ADT: 18,551

PEA VINE RUN ROAD

Good

Over: PEA VINE RUN

0.50 MI W OF MD 807, Allegany, MD

Built 2009 Load: 55.3 t ADT: 186

NEW SCHOOL ROAD

Good

Over: DUTCH HOLLOW RUN

0.4 MI. N. OF MD 36, Allegany, MD

Built 1954 Load: 55.3 t ADT: 306

MD 948AF

Good

Over: IS 68

AT IS 68, Allegany, MD

Built 1990 Load: 56.2 t ADT: 221

MARKET STREET

Good

Over: WMSRR

0.09 M S OF N MECHANIC ST, Allegany, MD

Built 1928 Load: 56.7 t ADT: 3,445

MD 55

Good

Over: BRADDOCK RUN

0.27 MI W OF IS 68, Allegany, MD

Built 1950 Load: 58.5 t ADT: 2,552

US 220

Good

Over: EVITTS CREEK

0.71 MILE NORTH OF I-68, Allegany, MD

Built 1999 Load: 58.5 t ADT: 3,841

MD 36

Good

Over: GEORGES CREEK

1.03 M S OF BR NO 0112700, Allegany, MD

Built 2008 Load: 59.9 t ADT: 7,706

MD 36

Good

Over: N BRANCH POTOMAC RIVER

ON WEST VIRGINIA LINE, Allegany, MD

Built 1994 Load: 59.9 t ADT: 4,720

MD 36

Good

Over: GEORGES CREEK

0.09 MILE SOUTH OF MD 935, Allegany, MD

Built 1981 Load: 61.2 t ADT: 5,740

MD 61 (CANAL PARKW

Good

Over: NORTH BRANCH OF POTOMAC

ON WEST VIRGINIA, Allegany, MD

Built 1992 Load: 61.7 t ADT: 11,501

RYE STREET

Good

Over: BRADDOCK RUN

0.20 MI W OF US 40 ALT, Allegany, MD

Built 2007 Load: 62.1 t ADT: 1,140

MD 736

Good

Over: SAND SPRING RUN

0.81 MI N OF IS 68, Allegany, MD

Built 1975 Load: 62.6 t ADT: 4,531

TOWN CREEK ROAD

Good

Over: TOWN CREEK

1.95 MI N OF L TOWN CK RD, Allegany, MD

Built 2001 Load: 63.5 t ADT: 525

IS 68 EBR

Good

Over: STREET ROAD

0.92 M E OF BR NO 0114600, Allegany, MD

Built 1990 Load: 63.9 t ADT: 19,030

MD 144

Good

Over: IS 68

0.48 M E OF BR NO 0114700, Allegany, MD

Built 1990 Load: 63.9 t ADT: 1,121

BRIDGE STREET

Good

Over: BRADDOCK RUN

0.14 MI NW OF US 40 ALT, Allegany, MD

Built 2009 Load: 63.9 t ADT: 275

MD 36

Good

Over: JENNINGS RUN

0.12 MI N OF MD 35, Allegany, MD

Built 1957 Load: 64.4 t ADT: 8,670

MARYLAND 36

Good

Over: MOORES RUN ROAD

0.30 MILE NORTH OF MD 935, Allegany, MD

Built 1975 Load: 70.3 t ADT: 5,740

SHAFT ROAD

Good

Over: GEORGES CREEK

0.13 MI W OF MD 936, Allegany, MD

Built 1940 Load: 71.0 t ADT: 432

IS 68 RAMPS 1 & 2

Good

Over: BRADDOCK RUN

N OF MD 53, Allegany, MD

Built 1972 Load: 71.7 t ADT: 703

MD 948AD

Good

Over: IS 68

0.07 MILE NORTH OF MD 144, Allegany, MD

Built 1990 Load: 72.6 t ADT: 1,314

OPESSA STREET

Good

Over: SEVEN SPRINGS RUN

1.15 MILES E OF MD 51, Allegany, MD

Built 2009 Load: 74.8 t ADT: 682

US 220

Good

Over: MASON ROAD

0.82 MILE NORTH OF I-68, Allegany, MD

Built 1999 Load: 76.2 t ADT: 3,841

US 40 SCN

Good

Over: SNIB HOLLOW RUN

0.43 M E OF BR NO 0103700, Allegany, MD

Built 2003 Load: 78.0 t ADT: 281

MD 36

Good

Over: NEFF RUN

0.05 M N OF OMARAS AVENUE, Allegany, MD

Built 1987 Load: 80.3 t ADT: 7,706

MD 807

Good

Over: PEA VINE RUN

0.86 MILE SOUTH OF US 220, Allegany, MD

Built 2002 Load: 80.7 t ADT: 5,092

IS 68 WBR

Good

Over: STREET ROAD

0.92 M E OF BR NO 0114600, Allegany, MD

Built 1990 Load: 83.0 t ADT: 19,030

MASON ROAD

Good

Over: ROCKY GAP RUN

0.23 MI S OF ROCKY GAP RD, Allegany, MD

Built 2017 Load: 84.9 t ADT: 205

IS 68 RAMP 6

Good

Over: PRATT HOLLOW

RP FR I 68 EB TO US 40SC, Allegany, MD

Built 1990 Load: 86.2 t ADT: 9,992

IS 68 RAMP 5

Good

Over: PRATT HOLLOW

RP FR US 40SC TO I 68 EB, Allegany, MD

Built 1990 Load: 88.0 t ADT: 9,992

MD 36

Good

Over: TRIB TO JENNINGS RUN

1.87 MI N OF MD 638, Allegany, MD

Built 2020 Load: 90.7 t ADT: 2,724

OLD LEGISLATIVE RD

Good

Over: WINEBRENNER RUN

0.14 MI S OF SHAFT-MIS RD, Allegany, MD

Built 2020 Load: 96.9 t ADT: 937

IS 68

Good

Over: LITTLE PINE LICK HOLLOW

0.46 MI W OF US 40 SCN, Allegany, MD

Built 1990 Load: 99.9 t ADT: 18,551

WAVERLY STREET

Good

Over: MD 36

0.38 MI N OF MD 825, Allegany, MD

Built 1975 Load: 99.9 t ADT: 529

MD 144

Good

Over: LITTLE PINE LICK HOLLOW

NEXT TO BR # 1089, Allegany, MD

Built 1990 Load: 99.9 t ADT: 1,121

US 40 SCN

Good

Over: PRATT HOLLOW

0.04 M S OF BR NO 0113300, Allegany, MD

Built 1990 Load: 99.9 t ADT: 284

MD 144

Good

Over: PRATT HOLLOW

0.28 M W OF BR NO 0113800, Allegany, MD

Built 1990 Load: 99.9 t ADT: 1,121

MD 948Y

Good

Over: SNIB HOLLOW

0.04 M S OF WASH CO LINE, Allegany, MD

Built 1988 Load: 99.9 t ADT: 99

IS 68 RAMP A(4)

Good

Over: WEST TRIB FLINTSTONE CRE

0.16 M W OF BR NO 0107700, Allegany, MD

Built 1990 Load: 99.9 t ADT: 999

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.