Montgomery County, MD

522 public highway bridges

Montgomery County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Montgomery County, Maryland contains 522 public highway bridges. Roughly 33% are rated “Good,” 46.7% “Fair,” and 4.6% “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.

522

Total Bridges

33%

Good

46.7%

Fair

4.6%

Poor Condition

Condition Distribution

Good

33% (172)

Fair

46.7% (244)

Poor

4.6% (24)

All Bridges (522)

Sort:

IS 270 NBR

Over: MD 109 & LI BENNETT CR

0.52 MI E OF FREDERICK CO, Montgomery, MD

Built 1951 ADT: 7,232

IS 270SBR

Over: MD 109 & LI BENNETT CR

0.52 MI E OF FREDERICK CO, Montgomery, MD

Built 1951 ADT: 7,232

COMUS ROAD

Over: IS 270

1.3 MI N OF MD 121, Montgomery, MD

Built 1952 ADT: 94,940

MD 121

Over: IS 270

1.28 M N OF BR NO 1503900, Montgomery, MD

Built 1952 ADT: 94,940

IS 270

Over: WEST OLD BALTIMORE RD

1.28 MILES E OF MD 121, Montgomery, MD

Built 1954 ADT: 1,580

MD 118

Over: IS 270

0.77 M N OF BR NO 1504200, Montgomery, MD

Built 1954 ADT: 119,710

IS 270

Over: MD 124

0.49 MILE NORTH OF MD 117, Montgomery, MD

Built 1955 ADT: 29,340

IS 270

Over: MD 117

0.49 MILE NORTH OF MD 124, Montgomery, MD

Built 1954 ADT: 43,322

MUDDY BRANCH ROAD

Over: IS 270 NB C-D ROAD

0.85 MILE NORTH OF IS 370, Montgomery, MD

Built 1954 ADT: 18,879

MUDDY BRANCH ROAD

Over: IS 270

0.85 MILE NORTH OF IS 370, Montgomery, MD

Built 1954 ADT: 188,702

SHADY GROVE ROAD

Over: IS 270

0.93 MILE SOUTH OF IS 370, Montgomery, MD

Built 1987 ADT: 146,985

MD 28

Over: IS 270

0.96 MILE NORTH OF MD 189, Montgomery, MD

Built 1955 ADT: 185,579

MD 189

Over: IS 270

0.96 MILE SOUTH OF MD 28, Montgomery, MD

Built 1955 ADT: 200,505

MD 355

Over: CSX TRANS, MU 681, MU 77

0.23 MI S OF MD 124, Montgomery, MD

Built 1987 ADT: 10,182

US 29

Over: MD 650

0.16 M S OF MILESTONE DR, Montgomery, MD

Built 1957 ADT: 42,190

MD 927-MONTROSE RD

Over: IS 270 NB C-D ROAD

1.36 MILES S OF MD 189, Montgomery, MD

Built 1998 ADT: 32,573

GROSVENOR LA

Over: IS 270

0.27 MILE NORTH OF IS 695, Montgomery, MD

Built 1958 ADT: 122,760

PEDESTRIAN

Over: US 29

0.06 MI S OF SLIGO AVE, Montgomery, MD

Built 1948 ADT: 41,902

MD 187

Over: IS 270

1027 M N OF BR NO 1507700, Montgomery, MD

Built 2002 ADT: 130,450

IS 270

Over: TUCKERMAN LANE

0.25 MI W OF IS 270Y, Montgomery, MD

Built 1958 ADT: 21,000

IS 270 RAMP 'C'

Over: IS 270Y RAMPS 'B' & 'B3'

.91 M N OF DEMOCRACY BLVD, Montgomery, MD

Built 1958 ADT: 132,561

CSX TRANSPORTATION

Over: IS 270

0.23 MI S OF MD 124, Montgomery, MD

Built 1987 ADT: 152,544

DEMOCRACY BLVD

Over: IS 270Y

0.79 MILE NORTH OF IS 495, Montgomery, MD

Built 2004 ADT: 132,561

IS 495 RAMP

Over: CLARA BARTON PKWY WBR

0.55 MI W OF MD 191, Montgomery, MD

Built 1963 ADT: 21,462

IS 495

Over: MAC ARTHUR BLVD & GWMP

0.55 MI W OF MD 191, Montgomery, MD

Built 1963 ADT: 12,002

PERSIMMON TREE RD

Over: IS 495

0.06 MI S OF MD 996, Montgomery, MD

Built 1962 ADT: 214,005

IS 495

Over: IS 495X & C J CR

0.24 MILE SOUTH OF IS 495, Montgomery, MD

Built 1962 ADT: 19,820

IS 495 RAMP 'K'

Over: IS 495X NBR

0.24 MILE SOUTH OF IS 495, Montgomery, MD

Built 1964 ADT: 19,820

MD 190

Over: IS 495

1.32 MILES WEST OF MD 191, Montgomery, MD

Built 1962 ADT: 220,020

MD 191

Over: IS 495 & THOMAS BRANCH

1.32 MILES EAST OF MD 190, Montgomery, MD

Built 1962 ADT: 220,020

IS 495 OL

Over: IS 270Y

0.05 MILE NORTH OF IS 495, Montgomery, MD

Built 1996 ADT: 129,011

GREENTREE RD

Over: IS 495

.29 MILE NORTH OF IS 270Y, Montgomery, MD

Built 1962 ADT: 115,850

FERNWOOD RD

Over: IS 495

0.78 MILE SOUTH OF MD 187, Montgomery, MD

Built 1962 ADT: 115,850

IS 495

Over: MD 187 (OLD G'TOWN RD)

0.2 M N OF RYLAND DRIVE, Montgomery, MD

Built 2004 ADT: 44,540

MD 355 SBR

Over: MD 355 RAMP 1

0.10 MI N OF IS 495, Montgomery, MD

Built 1960 ADT: 10,596

MD 355 SBR

Over: IS 495 OL

1.02 MILES EAST OF MD 187, Montgomery, MD

Built 1960 ADT: 115,750

MD 355 NBR

Over: IS 495 OL

1.1 MILES EAST OF MD 187, Montgomery, MD

Built 1960 ADT: 238,050

MD 355 SBR

Over: IS 495 IL

1.02 MILES EAST OF MD 187, Montgomery, MD

Built 1960 ADT: 115,750

MD 355 NBR

Over: IS 495 IL

1.1 MILES EAST OF MD 187, Montgomery, MD

Built 1960 ADT: 238,050

IS 495

Over: MD 185(CONNECTICUT AVE)

1.24 MILE NORTH OD MD 410, Montgomery, MD

Built 1964 ADT: 44,232

IS 495

Over: KENSIGNTON PARKWAY

0.19 MI E OF MD 185, Montgomery, MD

IS 495

Over: STONEY BROOK DR, ROCK CR

0.67 MI W OF MD 391, Montgomery, MD

Built 1964 ADT: 3,140

FOREST GLEN ROAD

Over: IS 495

0.86 MILE WEST OF MD 97, Montgomery, MD

Built 1964 ADT: 239,310

CSX TRANSPORTATION

Over: IS 495

0.69 MILE WEST OF MD 97, Montgomery, MD

Built 1959 ADT: 239,310

SEMINARY ROAD

Over: IS 495

0.62 MILE WEST OF MD 97, Montgomery, MD

Built 1964 ADT: 239,310

IS 495

Over: MD 97

0.17 MILE SOUTH OF MD 192, Montgomery, MD

Built 1958 ADT: 80,840

IS 495

Over: SLIGO CREEK PARKWAY

0.61 MI E OF MD 97, Montgomery, MD

Built 1959 ADT: 5,587

US 29

Over: IS 495

0.64 MILE WEST OF MD 193, Montgomery, MD

Built 1959 ADT: 214,980

MD 193

Over: IS 495

0.64 MILE EAST OF US 29, Montgomery, MD

Built 1958 ADT: 210,927

IS 495

Over: MD 650

2.19 MILE NORTH OF MD 193, Montgomery, MD

Built 1963 ADT: 54,900

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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Every figure on PlainBridge 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.