Frederick County, MD

491 public highway bridges

Frederick County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Frederick County, Maryland contains 491 public highway bridges. Roughly 38.9% are rated “Good,” 40.3% “Fair,” and 2.6% “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.

491

Total Bridges

38.9%

Good

40.3%

Fair

2.6%

Poor Condition

Condition Distribution

Good

38.9% (191)

Fair

40.3% (198)

Poor

2.6% (13)

All Bridges (491)

Sort:

US 340

Over: MD 180 WBR

0.3 MILE WEST OF MD 478, Frederick, MD

Built 1964 ADT: 1,183

IS 270

Over: MD 85

1.16 MILE SOUTH OF MD 355, Frederick, MD

Built 1950 ADT: 22,780

IS 270

Over: BAKER VALLEY ROAD

2.93 MILES W OF MD 80, Frederick, MD

IS 270

Over: BAKER VALLEY ROAD

2.93 MILES W OF MD 80, Frederick, MD

PARK MILLS ROAD

Over: IS 270

1.44 MILES NORTH OF MD 80, Frederick, MD

Built 1950 ADT: 80,340

IS 270 NBR

Over: MD 80

0.54 MILEWEST OF MD 355, Frederick, MD

Built 1950 ADT: 19,691

IS 270 SBR

Over: MD 80

0.54 MILEWEST OF MD 355, Frederick, MD

Built 1950 ADT: 19,691

IS 270

Over: DR. PERRY ROAD

1.15 MILES W OF MONT CO, Frederick, MD

Built 2010 ADT: 500

US 15 NBR

Over: MD 26

0.43 MILE WEST OF MD 355, Frederick, MD

Built 1957 ADT: 30,292

US 15 SBR

Over: MD 26

0.43 MILE WEST OF MD 355, Frederick, MD

Built 1968 ADT: 30,292

MOTTER AVE

Over: US 15

0.53 MI S OF MD 26, Frederick, MD

Built 1958 ADT: 76,550

US 15 NBR

Over: WEST SEVENTH ST

1.27 MILES N OF US 40, Frederick, MD

Built 1958 ADT: 14,161

US 15 SBR

Over: WEST SEVENTH ST

1.27 MILES N OF US 40, Frederick, MD

Built 1968 ADT: 14,161

US 15 NBR

Over: ROSEMONT AVE

0.77 MI N OF US 40, Frederick, MD

Built 1958 ADT: 4,090

US 15 SBR

Over: ROSEMONT AVE

0.77 MI N OF US 40, Frederick, MD

Built 1968 ADT: 4,090

US 15 NBR

Over: US 40/W. PATRICK STREET

AT US 15, Frederick, MD

Built 1958 ADT: 6,751

US 15 SBR

Over: US 40/W. PATRICK STREET

AT US 15, Frederick, MD

Built 1958 ADT: 6,751

US 15B

Over: US 15/US 40

AT US 15/US 340, Frederick, MD

Built 1955 ADT: 44,760

IS 70 EBR & RAMP L

Over: IS 270

1.35 MILES NORTH OF MD 85, Frederick, MD

Built 1955 ADT: 109,670

NEW DESIGN ROAD

Over: IS 70

0.51 MI W OF MD 355, Frederick, MD

Built 2002 ADT: 90,670

MD 355

Over: IS 70

0.83 MILE EAST OF IS 270, Frederick, MD

Built 1955 ADT: 81,630

IS 70 EBR

Over: CSX TRANS & E SOUTH ST

0.52 MI W OF MD 144FA, Frederick, MD

Built 1957 ADT: 7,841

IS 70 WBR

Over: CSX TRANS & E SOUTH ST

0.52 MI W OF MD 144 FA, Frederick, MD

Built 1957 ADT: 7,841

MD 144FA

Over: IS 70

0.53 M E OF BR NO 1010600, Frederick, MD

Built 1984 ADT: 68,623

US 15 NBR

Over: MD 77, HUNTING CREEK

0.03 M E OF MOUNTAIN ROAD, Frederick, MD

Built 1957 ADT: 8,551

NEW DESIGN ROAD

Over: IS 270

1.03 MI N OF MD 85, Frederick, MD

Built 2001 ADT: 109,670

US 340 EBR

Over: S MOUNTAIN ROAD

0.27 MI E OF MD 180, Frederick, MD

US 340 WBR

Over: S MOUNTAIN ROAD

0.27 MI E OF MD 180, Frederick, MD

MD 17

Over: US 340

1.79 MILES EAST OF MD 180, Frederick, MD

Built 1964 ADT: 26,902

CATHOLIC CHURCH RD

Over: US 340

1.57 MILES EAST OF MD 17, Frederick, MD

Built 1964 ADT: 26,902

ST MARKS ROAD

Over: US 340

2.41 MILES EAST OF MD 17, Frederick, MD

Built 1964 ADT: 26,902

MD 180

Over: US 340

3.38 MILES EAST OF MD 17, Frederick, MD

Built 1964 ADT: 28,982

HORINE ROAD

Over: US 340

0.94 M W OF LANDER ROAD, Frederick, MD

Built 1965 ADT: 28,982

LANDER ROAD

Over: US 340

0.94 M E OF HORINE ROAD, Frederick, MD

Built 1965 ADT: 32,282

US 340 EBR

Over: US 15 SBR

4.34 MILES SOUTH OF IS 70, Frederick, MD

Built 1966 ADT: 16,060

IS 270 WBR(RAMP 1)

Over: IS 70 EBR

0.09 MILE EAST OF IS 270, Frederick, MD

Built 1967 ADT: 90,670

IS 270 RAMPS J & F

Over: NEW DESIGN ROAD

0.32 M S OF BR NO 1013700, Frederick, MD

Built 2002 ADT: 15,170

MT PHILLIP ROAD

Over: IS 70

0.89 MILE EAST OF US 40AL, Frederick, MD

Built 1967 ADT: 74,920

IS 70 EBR

Over: HOLLOW ROAD

2.77 MILES W OF US 40, Frederick, MD

Built 1968 ADT: 510

IS 70 WBR

Over: HOLLOW ROAD

2.77 MILES W OF US 40, Frederick, MD

Built 1968 ADT: 510

IS 70 EBR & RAMP B

Over: MD 180

0.27 MILE EAST OF US 15, Frederick, MD

Built 1968 ADT: 25,990

IS 70 WBR

Over: MD 180

0.27 MILE EAST OF US 15, Frederick, MD

Built 1968 ADT: 25,990

IS 70 EBR

Over: HARMONY RD & LI CATOC.

1.95 MILES E OF MD 17, Frederick, MD

Built 1968 ADT: 125

IS 70 WBR

Over: HARMONY RD & LI CATOC.

1.95 MILES E OF MD 17, Frederick, MD

Built 1968 ADT: 125

IS 70 EBR

Over: US 40AL

1.37 MILES WEST OF US 40, Frederick, MD

Built 1967 ADT: 12,112

IS 70 WBR

Over: US 40AL

1.37 MILES WEST OF US 40, Frederick, MD

Built 1967 ADT: 12,112

APPALACHIAN TRAIL

Over: IS 70

0.02 M E OF WASH CO LINE, Frederick, MD

Built 1968 ADT: 58,600

IS 70 EBR

Over: MONUMENT ROAD

1.59 MILES E OF WASH CO, Frederick, MD

Built 1968 ADT: 147

IS 70 WBR

Over: MONUMENT ROAD

1.59 MILES E OF WASH CO, Frederick, MD

Built 1968 ADT: 147

IS 70 EBR

Over: MT TABOR ROAD

1.17 MILES W OF MD 17, Frederick, MD

Built 1968 ADT: 568

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

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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