Frederick County, MD

491 public highway bridges

Frederick County Bridge Snapshot

Frederick County, Maryland contains 491 public highway bridges in the FHWA National Bridge Inventory. Roughly 38.9% are rated “Good,” 40.3% “Fair,” 2.6% “Poor,” and 2.6% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in MD are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

491

Total Bridges

38.9%

Good

2.6%

Poor

2.6%

Structurally Deficient

Condition Distribution

Good

38.9% (191)

Fair

40.3% (198)

Poor

2.6% (13)

SD

2.6% (13)

All Bridges (491)

Sort:

IS 70 WBR

Over: MT TABOR ROAD

1.17 MILES W OF MD 17, Frederick, MD

Built 1968 ADT: 568

MD 17

Over: IS 70

1.15 M E OF MT TABOR ROAD, Frederick, MD

Built 1968 ADT: 68,230

IS 70 WBR

Over: IS 270

0.09 M N OF BR NO 1010300, Frederick, MD

Built 1968 ADT: 109,670

IS 70 WBR

Over: US 40 EBR(RAMP 5)

0.5 MILE EAST OF MD 180, Frederick, MD

Built 2002 ADT: 18,542

ELMER DERR ROAD

Over: US 15

0.46 MILE SOUTH OF US 340, Frederick, MD

Built 1969 ADT: 16,060

IS 70 RAMPS A & E

Over: MD 180

0.27 MILE EAST OF US 15, Frederick, MD

Built 1968 ADT: 25,990

IS 70 EBR

Over: US 15

0.24 MILE WEST OF MD 180, Frederick, MD

Built 1968 ADT: 26,810

IS 70 WBR

Over: US 15

0.24 MILE WEST OF MD 180, Frederick, MD

Built 1968 ADT: 26,810

IS 70 EBR

Over: IS 70 RAMP 'A'

0.28 MI E OF MD 180, Frederick, MD

Built 1968 ADT: 8,557

IS 70 WBR

Over: RAMP 'A'

0.28 MI E OF MD 180, Frederick, MD

Built 1968 ADT: 8,557

IS 70 RAMPS A & E

Over: US 15/US 340

0.09 MILE NORTH OF IS 70, Frederick, MD

Built 1968 ADT: 26,810

MD 180

Over: IS 70

0.37 MILE WESY OF US 15, Frederick, MD

Built 1968 ADT: 74,920

IS 70 EBR

Over: IS 70 RAMP 'E'

0.29 MI W OF US 40 AL, Frederick, MD

Built 1969 ADT: 4,781

IS 70 WBR

Over: IS 70 RAMP 'E'

0.29 MI W OF US 40 AL, Frederick, MD

Built 1969 ADT: 4,781

US 40 EBR

Over: IS 70 RAMP 'F' (02)

0.87 MI W OF FREDERICK, Frederick, MD

Built 1969 ADT: 3,593

MD 180

Over: US 15

0.48 MI E OF IS 70, Frederick, MD

Built 1968 ADT: 44,760

MT ZION ROAD

Over: US 15

1.88 MILE NORTH OF US 340, Frederick, MD

Built 1968 ADT: 51,930

MD 140

Over: US 15

0.1 MILE NORTH OF MD 904F, Frederick, MD

Built 1971 ADT: 17,010

US 15 NBR

Over: MD 550

0.8 MILE SOUTH OF MD 77, Frederick, MD

Built 1972 ADT: 7,221

RIDGE ROAD

Over: IS 70

1.87 MI W OF US 40AL, Frederick, MD

Built 1972 ADT: 68,230

MD 75

Over: IS 70

0.07 M E OF BR NO 1017500, Frederick, MD

Built 1973 ADT: 69,020

MUSSETTER ROAD

Over: IS 70

2.1 MILE WEST OF MD 75, Frederick, MD

Built 1973 ADT: 67,980

BARTHOLOWS ROAD

Over: IS 70,CSX TRANSPORTATION

2.27 MILE EAST OF MD 75, Frederick, MD

Built 1974 ADT: 69,020

IS 70 EBR

Over: BILL MOXELY ROAD

1.75 MI W OF CARROLL CO, Frederick, MD

IS 70 WBR

Over: BILL MOXLEY ROAD

1.75 MI W OF CARROLL CO, Frederick, MD

US 15 SBR

Over: MD 550

0.37 MI N OF MD 15D, Frederick, MD

Built 1982 ADT: 7,221

US 15 NBR

Over: MD 77, HUNTING CREEK

0.03 M E OF MOUNTAIN ROAD, Frederick, MD

Built 1985 ADT: 8,551

US 15 NBR

Over: MD 15C

0.76 MI S OF MD 77, Frederick, MD

Built 1985 ADT: 999

US 15 SBR

Over: MD 15C

0.76 MI S OF MD 77, Frederick, MD

Built 1985 ADT: 999

PEDESTRIAN

Over: US 15

0.913 M N OF MD 806A, Frederick, MD

Built 1983 ADT: 30,800

LINGANORE ROAD

Over: IS 70

1.48 M W OF QUINN ROAD, Frederick, MD

Built 1985 ADT: 59,922

IS 70 EBR

Over: SPRING RIDGE PKWY

2.38 MI E OF FREDERICK, Frederick, MD

IS 70 WBR

Over: SPRING RIDGE PKWY

2.38 MI E OF FREDERICK, Frederick, MD

QUINN ROAD

Over: IS 70

1.48 M E OF LINGANORE RD, Frederick, MD

Built 1985 ADT: 59,922

IS 70 EBR

Over: OLD NATIONAL PIKE

3.93 MI W OF MD 75, Frederick, MD

Built 1985 ADT: 8,831

IS 70 WBR

Over: OLD NATIONAL PIKE

3.93 MI W OF MD 75, Frederick, MD

Built 1985 ADT: 8,831

IS 70 RAMP 'B'

Over: MD 180

0.14 MILE WEST OF MD 351, Frederick, MD

Built 1996 ADT: 25,990

IS 70 RAMP '7'

Over: US 40 RAMP '5'

0.34 MILE EAST OF US 15, Frederick, MD

Built 2002 ADT: 18,542

MD 85

Over: IS 70

AT IS 70, Frederick, MD

Built 2009 ADT: 82,042

BLACKS MILL ROAD

Over: BIG HUNTING CREEK

WEST OF LAYMAN RD INT, Frederick, MD

Built 1914 Load: 10.4 t ADT: 450

BENNIES HILL ROAD

Over: CATOCTIN CREEK

0.65 MI EAST OF MD 17, Frederick, MD

Built 1880 Load: 13.2 t ADT: 131

KEYSVILLE ROAD

Over: TOMS CREEK

2.0 MI NORTHEAST OF MD 76, Frederick, MD

Built 1876 Load: 13.6 t ADT: 451

MD 550

Over: CABBAGE RUN

1.39 MILES NORTH OF MD 26, Frederick, MD

Built 1939 Load: 14.5 t ADT: 2,785

STEVENS ROAD

Over: HUNTING CREEK

WEST OF OLD FREDERICK RD, Frederick, MD

Built 1914 Load: 14.5 t ADT: 135

HOLTER ROAD

Over: HOLLOW CREEK

1 MILE SOUTHEAST OF MD 17, Frederick, MD

Built 1920 Load: 15.4 t ADT: 3,333

MAINTENANCE ROAD

Over: BLUE BLAZES CREEK

US-15N, WEST ON MC-77 TO, Frederick, MD

Built 1960 Load: 15.4 t ADT: 50

CROW ROCK ROAD

Over: MIDDLE CREEK

AT MD 17 INTERSECTION, Frederick, MD

Built 1897 Load: 16.3 t ADT: 460

SUMANTOWN ROAD

Over: CATOCTIN CREEK

1.5 MI W OLD MIDDLETOWN R, Frederick, MD

Built 1900 Load: 16.3 t ADT: 124

STATION ROAD

Over: CATOCTIN CREEK

0.5 MI W OF OLD HAGERSTOW, Frederick, MD

Built 1920 Load: 16.8 t ADT: 133

OLD MILL ROAD

Over: OWENS CREEK

0.87 MILES SOUTH OF MD 77, Frederick, MD

Built 1882 Load: 17.2 t ADT: 360

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 5, 2026