Total bridges
245
Public highway bridges in Allegany County
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.
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
- pre-1900 1
Built before 1900
1 bridges
- 1900s 7
1900–1909
7 bridges
- 1910s 4
1910–1919
4 bridges
- 1920s 10
1920–1929
10 bridges
- 1930s 23
1930–1939
23 bridges
- 1940s 11
1940–1949
11 bridges
- 1950s 23
1950–1959
23 bridges
- 1960s
1960–1969
33 bridges
- 1970s 23
1970–1979
23 bridges
- 1980s 17
1980–1989
17 bridges
- 1990s
1990–1999
58 bridges
- 2000s 18
2000–2009
18 bridges
- 2010s 10
2010–2019
10 bridges
- 2020s 7
2020–2029
7 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).
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.
| 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 | 275 | 38.2% | 57.1% | 4.7% | 1973 |
| Allegany County (this page) | 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 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).
- Henderson County, NC · 245 bridges
- Rowan County, NC · 245 bridges
- Highland County, OH · 245 bridges
- Pike County, OH · 245 bridges
Similar average build year
Nearest mean year-built outside MD (1971 here).
- Wayne County, MI · avg 1971 · 1,026 bridges
- Washington County, PA · avg 1971 · 655 bridges
- Linn County, OR · avg 1971 · 566 bridges
- Monmouth County, NJ · avg 1971 · 505 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (140)
SPRING GAP ACCESS
FairOver: C&O CANAL
0.1 miles from Spring Gap, Allegany, MD
Built 1969 Load: 15.4 t ADT: 72
SLABTOWN ROAD
FairOver: UNNAMED STREAM
0.40 MI NE OF MD 36, Allegany, MD
Built 1991 Load: 15.9 t ADT: 258
WINDY RIDGE DRIVE
FairOver: JENNINGS RUN
1.3 MI W OF MD 35, Allegany, MD
Built 1959 Load: 20.0 t ADT: 10
US 220
FairOver: TRIB TO NORTH BR POTOMAC
1.46 MI N OF MD 830A, Allegany, MD
Built 1929 Load: 20.4 t ADT: 7,111
PARADISE STREET
FairOver: NEFF RUN
0.14 MI S OF MD 36, Allegany, MD
Built 1994 Load: 20.9 t ADT: 920
US 40 SCN
FairOver: FIFTEEN MILE CREEK
0.19 M E OF BR NO 0113300, Allegany, MD
Built 1917 Load: 21.3 t ADT: 281
MAIN ST-LONACONING
FairOver: GEORGES CREEK
0.02 MI E OF MD 36, Allegany, MD
Built 1957 Load: 21.8 t ADT: 153
MASON ROAD
FairOver: EVITTS CREEK
1.26 MI N OF ZEMBOWER RD, Allegany, MD
Built 1950 Load: 22.2 t ADT: 219
MD 636
FairOver: WARRIOR RUN
0.27 MI E OF MD 53, Allegany, MD
Built 1936 Load: 25.4 t ADT: 8,071
MD 658
FairOver: BRADDOCK RUN
0.11 MI N OF US 48, Allegany, MD
Built 1968 Load: 25.4 t ADT: 11,250
MAIN ST (MD 937)
FairOver: BRANCH OF GEORGES CREEK
0.36 MI N OF W VA LINE, Allegany, MD
Built 1933 Load: 25.8 t ADT: 3,555
TOWN CREEK ROAD
FairOver: TOWN CREEK
1.95 MI N OF L TOWN CK RD, Allegany, MD
Built 1964 Load: 25.8 t ADT: 320
MD 942
FairOver: N BRANCH POTOMAC RIVER
ON WEST VIRGINIA LINE, Allegany, MD
Built 1953 Load: 27.2 t ADT: 7,278
US 220
FairOver: MILL RUN
1.88 MI S OF MD 830B, Allegany, MD
Built 1929 Load: 28.1 t ADT: 7,111
TEMPERANCE ROW
FairOver: GEORGES CREEK
0.08 MI N OF MD 935, Allegany, MD
Built 1976 Load: 29.0 t ADT: 206
FOREST GROVE ROAD
FairOver: WILLS CREEK
0.11 MI W OF SHELLSBUR RD, Allegany, MD
Built 1977 Load: 29.0 t ADT: 393
MD 935
FairOver: GEORGES CREEK
0.09 M N OF C STREET, Allegany, MD
Built 1933 Load: 29.9 t ADT: 1,430
MD 636
FairOver: WARRIOR RUN
0.02 MILE EAST OF MD 53, Allegany, MD
Built 1936 Load: 30.4 t ADT: 8,071
MD 935
FairOver: GEORGES CREEK
0.24 MI S OF MD 935A, Allegany, MD
Built 1930 Load: 30.8 t ADT: 1,430
US 40 ALT
FairOver: BRADDOCK RUN
1.28 MI W OF MD 831A, Allegany, MD
Built 1948 Load: 30.8 t ADT: 13,491
US 40 ALT
FairOver: BRADDOCK RUN
0.02 MI W OF MD 55, Allegany, MD
Built 1947 Load: 31.7 t ADT: 9,951
MD 53
FairOver: WINCHESTER RUN
0.62 MILE NORTH OF MD 951, Allegany, MD
Built 1924 Load: 31.7 t ADT: 12,872
US 220
FairOver: TRIB TO NORTH BR POTOMAC
1.21 M N OF MD 830A, Allegany, MD
Built 1900 Load: 31.7 t ADT: 7,111
IS 68 EBR
FairOver: MD 55
1.53 MI E OF MD 36, Allegany, MD
Built 1973 Load: 31.7 t ADT: 26,410
BLACK VALLEY ROAD
FairOver: FLINTSTONE CREEK
0.02 MI E OF DOLLY RD, Allegany, MD
Built 1964 Load: 31.7 t ADT: 499
MD 36
FairOver: JENNINGS RUN
1.83 MI S OF MD 47, Allegany, MD
Built 1929 Load: 32.2 t ADT: 2,290
MD 956
FairOver: POTOMAC RIVER
ON WEST VIRGINIA LINE, Allegany, MD
Built 1967 Load: 32.4 t ADT: 7,150
US 40 ALT
FairOver: PORTER RUN
.04 MILES WEST OF MD 743, Allegany, MD
Built 1948 Load: 32.7 t ADT: 9,951
IS 68
FairOver: GEORGES CREEK
0.16 MILE WEST OF MD 936, Allegany, MD
Built 1972 Load: 32.7 t ADT: 23,640
LOWER GEORGES CK R
FairOver: MILL RUN
0.75 MI S OF MD RTE 935, Allegany, MD
Built 1930 Load: 32.7 t ADT: 336
SQUIRREL NECK ROAD
FairOver: GEORGES CREEK
0.03 MI W OF CHURCH H RD, Allegany, MD
Built 1998 Load: 32.7 t ADT: 155
COBBLESTONE ROAD
FairOver: JENNINGS RUN
0.04 MI S OF MD 36, Allegany, MD
Built 1940 Load: 32.7 t ADT: 286
CHRISTIE ROAD
FairOver: UNNAMED STREAM
0.27 MI. S. OF JEFFRIES R, Allegany, MD
Built 1995 Load: 32.7 t ADT: 1,225
VICTORY POST DRIVE
FairOver: GEORGES CREEK
0.04 MI N OF MD 937, Allegany, MD
Built 1950 Load: 33.1 t ADT: 1,599
MD 51
FairOver: C&O CANAL
0.64 MI W OF W VA LINE, Allegany, MD
Built 1932 Load: 33.4 t ADT: 1,642
US 220
FairOver: N POTOMAC RIVER MD 135
ON WEST VIRGINIA LINE, Allegany, MD
Built 2012 Load: 33.6 t ADT: 16,452
IS 68
FairOver: WILLS CREEK CSX RR MUN
3 MI. SW. OF US 220, Allegany, MD
Built 1968 Load: 34.0 t ADT: 53,950
BEDFORD STREET / F
FairOver: US 40 ALT CSX QUEEN CI
FREDERICK ST @ US 40ALT, Allegany, MD
Built 1977 Load: 34.0 t ADT: 11,771
IS 68 WBR
FairOver: MD 55
1.53 MILE EAST OF MD 36, Allegany, MD
Built 1973 Load: 34.5 t ADT: 26,410
OLD CUMBERLAND RD
FairOver: IS 68
AT IS 68, Allegany, MD
Built 1990 Load: 34.9 t ADT: 999
PROENTY ROAD
FairOver: JENNINGS RUN
0.02 MI S OF MD 36, Allegany, MD
Built 1926 Load: 34.9 t ADT: 1,125
SMOUSES MILL ROAD
FairOver: EVITTS CREEK
0.67 MI S OF US 220, Allegany, MD
Built 2002 Load: 34.9 t ADT: 238
US 40 ALT
FairOver: BRADDOCK RUN
0.08 MILE EAST OF MD 53, Allegany, MD
Built 1947 Load: 35.4 t ADT: 12,812
MD 639 WILLIAMS RD
FairOver: EVITTS CREEK
1.51 MILES SOUTH OF IS 68, Allegany, MD
Built 1966 Load: 36.3 t ADT: 2,530
MD 51
FairOver: CSX TRANS. MD 61
0.40 MI E OF MD 51A, Allegany, MD
Built 1965 Load: 36.7 t ADT: 14,721
IS 68 EBR
FairOver: MD 736 (MIDLOTHIAN ROAD)
0.83 MILE WEST OF MD 936, Allegany, MD
Built 1972 Load: 36.7 t ADT: 23,640
MD 36
FairOver: IS 68
0.91 MILE NORTH OF MD 55, Allegany, MD
Built 1972 Load: 36.7 t ADT: 6,853
LOCUST GROVE ROAD
FairOver: WILLS CREEK
AT US 40 ALT, Allegany, MD
Built 1900 Load: 37.2 t ADT: 142
US 220
FairOver: MILL RUN
.13 MILE NORTH OF MD 830B, Allegany, MD
Built 1950 Load: 37.6 t ADT: 7,111
IS 68
FairOver: PATTERSON AVENUE
0.54 MILE EAST OF US 220, Allegany, MD
Built 1968 Load: 37.6 t ADT: 46,611
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.