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

Fair-condition bridges (140)

IS 68 WB

Fair

Over: MARYLAND 736 (MIDLOTHIAN

0.83 MILE WEST OF MD 936, Allegany, MD

Built 1972 Load: 37.6 t ADT: 23,640

MD 36

Fair

Over: NEFF RUN

2.57 MI S OF MD 55, Allegany, MD

Built 1939 Load: 38.1 t ADT: 6,750

IS 68

Fair

Over: EVITTS CREEK

0.21 M E OF BR NO 0109900, Allegany, MD

Built 1937 Load: 38.5 t ADT: 26,680

MD 51

Fair

Over: POTOMAC RIVER

ON WEST VIRGINIA LINE, Allegany, MD

Built 1987 Load: 39.0 t ADT: 1,502

FLETCHER DRIVE

Fair

Over: IS 68

FLETCHER DR, Allegany, MD

Built 1968 Load: 39.0 t ADT: 944

MD 51

Fair

Over: SAWPIT RUN

0.48 M E OF PACK HORSE RD, Allegany, MD

Built 1932 Load: 39.9 t ADT: 2,142

IS 68 EBR

Fair

Over: MD 53

0.73 MI W OF MD 658, Allegany, MD

Built 1971 Load: 39.9 t ADT: 29,700

MD 935

Fair

Over: MOORES RUN

0.28 MI N OF MD 36, Allegany, MD

Built 1933 Load: 40.4 t ADT: 1,430

MD 53

Fair

Over: WARRIOR RUN

0.11 MILE SOUTH OF MD 636, Allegany, MD

Built 1953 Load: 40.4 t ADT: 12,872

ORLEANS ROAD

Fair

Over: IS 68

AT IS 68, Allegany, MD

Built 1968 Load: 40.4 t ADT: 2,113

IS 68

Fair

Over: KELLY BLVD CSX TRANS.

0.29 MI W OF KELLY RD, Allegany, MD

Built 1968 Load: 40.4 t ADT: 46,611

IS 68 EB

Fair

Over: MD 936

0.86 MILE WEST OF MD 36, Allegany, MD

Built 1972 Load: 40.4 t ADT: 23,640

IS 68 WB

Fair

Over: MD 936

0.86 MI W OF MD 36, Allegany, MD

Built 1972 Load: 40.4 t ADT: 23,640

IS 68 WBR

Fair

Over: MD 53

0.73 MI W OF MD 658, Allegany, MD

Built 1971 Load: 40.4 t ADT: 29,700

MARKET STREET

Fair

Over: WILLS CREEK

0.03 MI S OF N MECHANC ST, Allegany, MD

Built 1954 Load: 41.3 t ADT: 3,692

GREEN SPRING ROAD

Fair

Over: MILL RUN

0.08 MI N OF MAIN ST, Allegany, MD

Built 1935 Load: 41.7 t ADT: 812

IS 68 RAMP E(4)

Fair

Over: CENTRE ST QUEEN CITY DR

0.52 MI E OF US 48H, Allegany, MD

Built 1968 Load: 42.2 t ADT: 6,507

VALLEY STREET

Fair

Over: WILLS CREEK / WMSRR

0.20 MI S OF US 40 ALT, Allegany, MD

Built 1955 Load: 42.2 t ADT: 6,149

IS 68

Fair

Over: US 220

2.39 MILE EAST OF MD 658, Allegany, MD

Built 1968 Load: 42.6 t ADT: 47,770

US 40 SCN

Fair

Over: SNIB HOLLOW RUN

0.48 M E OF STONE ROAD, Allegany, MD

Built 1916 Load: 43.1 t ADT: 281

FLINTSTONE CREEK R

Fair

Over: FLINTSTONE CREEK

0.30 MI S OF PA LINE, Allegany, MD

Built 1930 Load: 43.1 t ADT: 141

MD 935

Fair

Over: BUTCHER RUN

0.03 M N OF BARTLETT ST, Allegany, MD

Built 1930 Load: 43.5 t ADT: 1,430

IS 68 RAMP D(5)

Fair

Over: CENTRE STREET

0.52 MI E OF US 48H, Allegany, MD

Built 1968 Load: 43.5 t ADT: 14,023

MD 135D W VA 46

Fair

Over: N BRANCH POTOMAC RIVER

ON WEST VIRGINIA LINE, Allegany, MD

Built 1985 Load: 43.5 t ADT: 4,527

HENDERSON AVENUE

Fair

Over: FRANKLIN STREET & CSX RR

0.14 MI. E. OF NATL HWY S, Allegany, MD

Built 1932 Load: 43.5 t ADT: 19,319

MD 956

Fair

Over: CSX TRANSPORTATION

0.18 MI W OF W VA LINE, Allegany, MD

Built 1967 Load: 44.0 t ADT: 7,151

US 220

Fair

Over: MD 135A

0.43 MI N OF MD 135B, Allegany, MD

Built 1952 Load: 44.4 t ADT: 7,111

IS 68

Fair

Over: MD 658

0.73 MILE EAST OF MD 53, Allegany, MD

Built 1968 Load: 44.4 t ADT: 38,810

IS 68 RAMP A(8)

Fair

Over: MECHANIC STREET

0.44 MI E OF US 48H, Allegany, MD

Built 1968 Load: 44.9 t ADT: 11,995

IS 68

Fair

Over: MD 144

0.57 MILE WEST OF US 220, Allegany, MD

Built 1967 Load: 45.8 t ADT: 26,680

CASH VALLEY ROAD

Fair

Over: UNNAMED STREAM

0.21 MI N OF US 40 ALT, Allegany, MD

Built 1966 Load: 46.3 t ADT: 3,430

MD 36

Fair

Over: NORTH BRANCH

0.04 MILE SOUTH OF MD 47, Allegany, MD

Built 1960 Load: 46.7 t ADT: 2,290

MD 948AL

Fair

Over: IS 68

1.27 MI E OF US 40 SC, Allegany, MD

Built 1990 Load: 46.7 t ADT: 110

MARION STREET

Fair

Over: I-68

0.23 MI W OF MD 639, Allegany, MD

Built 1968 Load: 46.7 t ADT: 30,530

WAVERLY STREET

Fair

Over: GEORGES CREEK

0.03 MI W OF MD 937, Allegany, MD

Built 1993 Load: 46.7 t ADT: 595

IS 68 RAMP F(2)

Fair

Over: CENTRE ST QUEEN CITY DR

0.52 MI E OF US 48H, Allegany, MD

Built 1968 Load: 47.2 t ADT: 1,412

PEA VINE RUN ROAD

Fair

Over: PEA VINE RUN

0.80 MI W OF MD 807, Allegany, MD

Built 1945 Load: 47.2 t ADT: 177

LAUREL RUN ROAD

Fair

Over: LAUREL RUN

1.26 MI W OF MD RTE 935, Allegany, MD

Built 1950 Load: 47.6 t ADT: 94

IS 68 RAMP C(7)

Fair

Over: MECHANIC STREET

0.44 MI E OF US 48H, Allegany, MD

Built 1968 Load: 48.1 t ADT: 13,163

IS 68

Fair

Over: FIFTEEN MILE CREEK

0.08 MI E OF US 40 SCN, Allegany, MD

Built 1990 Load: 48.5 t ADT: 18,400

US 220

Fair

Over: WARRIOR RUN

0.16 MILE NORTH OF MD 636, Allegany, MD

Built 1900 Load: 49.0 t ADT: 15,191

ROBBIN STREET

Fair

Over: JACKSON RUN

0.05 MI E OF JACKSON ST, Allegany, MD

Built 1946 Load: 49.0 t ADT: 338

MD 144

Fair

Over: IS 68

0.48 M W OF BR NO 0114600, Allegany, MD

Built 1990 Load: 49.9 t ADT: 1,121

UPPER POTOMAC INDU

Fair

Over: CSXT RAILROAD

0.08 MI E OF US 220, Allegany, MD

Built 1975 Load: 49.9 t ADT: 120

MD 952

Fair

Over: IS 68

0.03 MI S OF MD 952A, Allegany, MD

Built 1962 Load: 50.3 t ADT: 99

MD 144

Fair

Over: ELK LICK CREEK

0.62 M E OF BR NO 0115400, Allegany, MD

Built 1960 Load: 50.3 t ADT: 1,121

IS 68 RAMP B(6)

Fair

Over: HOWARD STREET

0.44 MI E OF US 48H, Allegany, MD

Built 1968 Load: 50.3 t ADT: 13,342

IRON RAIL STREET

Fair

Over: JENNINGS RUN

0.02 MI S OF MD 36, Allegany, MD

Built 1935 Load: 51.7 t ADT: 1,224

PITTSBURGH PG ROAD

Fair

Over: CSXT / LOCKHOUSE RD

0.23 MI NW OF MD 51, Allegany, MD

Built 1957 Load: 52.6 t ADT: 2,085

WATERCLIFF STREET

Fair

Over: HILL RUN

0.01 MI S OF WATER STA RD, Allegany, MD

Built 1955 Load: 53.1 t ADT: 161

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.