Montgomery County, MD

522 public highway bridges

Montgomery County Bridge Snapshot

Montgomery County, Maryland contains 522 public highway bridges in the FHWA National Bridge Inventory. Roughly 33% are rated “Good,” 46.7% “Fair,” 4.6% “Poor,” and 4.6% 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.

522

Total Bridges

33%

Good

4.6%

Poor

4.6%

Structurally Deficient

Condition Distribution

Good

33% (172)

Fair

46.7% (244)

Poor

4.6% (24)

SD

4.6% (24)

All Bridges (522)

Sort:

MD 650 RAMP 'F'

Over: IS 495

0.10 MI W OF PG CO LINE, Montgomery, MD

Built 1964 ADT: 243,712

IS 495 SE RAMP

Over: CLARA BARTON PKWY

0.39 MI E OF VA LINE, Montgomery, MD

Built 1963 ADT: 13,090

IS 495 NW RAMP

Over: MACARTHUR BOULEVARD

0.58 MI E OF VA LINE, Montgomery, MD

Built 1963 ADT: 12,002

IS 270 SBR

Over: IS 495 OL

0.15 MILE WEST OF IS 270, Montgomery, MD

Built 1990 ADT: 115,750

SHADY GROVE ROAD

Over: IS 370

0.48 m e of br no 1515000, Montgomery, MD

Built 1989 ADT: 78,741

IS 370 EBR

Over: IS 370 RAMP 'J'

0.22 MILE EAST OF MD 355, Montgomery, MD

Built 1988 ADT: 6,228

IS 370

Over: MD 355

.06 M N OF SHADY GROVE RD, Montgomery, MD

Built 1989 ADT: 34,970

INDUSTRIAL DRIVE

Over: IS 370

0.5 MI E OF IS 270, Montgomery, MD

Built 1990 ADT: 78,741

IS 370 RAMP'F'

Over: IS 370

0.16 MILE EAST OF IS 270, Montgomery, MD

Built 1990 ADT: 78,741

IS 270

Over: IS 370

1.2 MILES WEST OF MD 355, Montgomery, MD

Built 1990 ADT: 78,741

IS 270 RAMP 'C'(5)

Over: IS 370 RAMP 'B'

1.24 MILES WEST OD MD 355, Montgomery, MD

Built 1990 ADT: 18,057

IS 270 RAMP 'C'(5)

Over: IS 270 RAMP 'F'(1)

0.21 MILE SOUTH OF IS 370, Montgomery, MD

Built 1990 ADT: 13,596

IS 370 RAMP 'F'(1)

Over: IS 270

0.08 MILE NORTH OF IS 370, Montgomery, MD

Built 1990 ADT: 216,270

IS 370 EBR

Over: IS 370 RAMP 'B'

0.07 MILE WEST OF IS 270, Montgomery, MD

Built 1990 ADT: 18,057

IS 270 RAMP 'A'(6)

Over: IS 495 OL

0.78 MILE EAST OF MD 187, Montgomery, MD

Built 1990 ADT: 115,750

ROCKLEDGE BL'VD

Over: IS 270

0.29 MILE NORTH OF MD 187, Montgomery, MD

Built 2002 ADT: 130,450

MD 927 & RAMP 'D'

Over: IS 270 RAMP 'I'

0.13 MILE EAST OF IS 270, Montgomery, MD

Built 1988 ADT: 1,487

IS 270 RAMP A 1

Over: IS 270Y

0.87 M N/DEMOCRACY BL'VD, Montgomery, MD

Built 1995 ADT: 132,561

DEER RIDGE ROAD

Over: MD 119

0.27 M S OF BR NO 1517400, Montgomery, MD

Built 1989 ADT: 20,731

MA 929A & MD 929B

Over: US 29

0.47 M N OF TECH ROAD, Montgomery, MD

Built 2006 ADT: 54,750

MD 929A

Over: US FUTURE RAMP E

0.033 MILE WEST OF US 29, Montgomery, MD

Built 2006 ADT: 3,385

US 29 NBR

Over: MD 198

1.29 M W OF PG CO LINE, Montgomery, MD

Built 2002 ADT: 41,221

US 29 SBR

Over: MD 198

1.29 M W OF PG CO LINE, Montgomery, MD

Built 2002 ADT: 41,221

DUSTIN ROAD

Over: US 29

.78 M S OF HOWARD CO LINE, Montgomery, MD

Built 2003 ADT: 49,203

BRIGGS CHANEY ROAD

Over: US 29

2.26 MILES S OF MD 198, Montgomery, MD

Built 2007 ADT: 51,532

WESTLAKE TERRACE-F

Over: I-270

1 MI N OF DEMOCRACY BLVD, Montgomery, MD

Built 1994 ADT: 133,092

FATHER HURLEY BOUL

Over: I-270

0.5MI E. OF CRYSTAL RK DR, Montgomery, MD

Built 1995 ADT: 97,601

FATHER HURLEY BOUL

Over: I-270

0.5MI E. OF CRYSTAL RK DR, Montgomery, MD

Built 1995 ADT: 97,601

BETHESDA TROLLEY T

Over: I-495

4.96 MI WEST OF I-270, Montgomery, MD

Built 2003 ADT: 112,619

BETHESDA TROLLEY T

Over: EAST SPUR OF I-270

.695 MI NORTH OF I-495, Montgomery, MD

Built 2003 ADT: 112,111

GUDE DRIVE WEST

Over: I-270

.35 MI EAST OF MD 28, Montgomery, MD

Built 1985 ADT: 240,421

WOOTTON PARKWAY

Over: I-270

0.2 MI. E. SEVEN LOCKS RD, Montgomery, MD

Built 1990 ADT: 263,331

MACARTHUR BLVD.

Over: CABIN JOHN CREEK

1.5 MI. E. OF I-495, Montgomery, MD

Built 1863 Load: 11.7 t ADT: 6,000

GLEN ROAD

Over: KILGOUR BRANCH

1.5 MI WEST OF MD 189, Montgomery, MD

Built 1942 Load: 13.6 t ADT: 5,880

GRIFFITH ROAD

Over: HAWLINGS RIVER

1 MI W OF JCT SR 650, Montgomery, MD

Built 1920 Load: 17.2 t ADT: 282

East Montgomery Ro

Over: Rockville Center Multipl

0.5 Miles West of Md. 355, Montgomery, MD

Built 1998 Load: 18.1 t ADT: 500

MD 28

Over: BR OF DRY SENECA CREEK

0.98 MILE WEST OF MD 117, Montgomery, MD

Built 1954 Load: 19.0 t ADT: 5,420

CARDEROCK ACCESS C

Over: CLARA BARTON PARKWAY

0.7 MILES WEST OF MACARTH, Montgomery, MD

Built 1962 Load: 19.0 t ADT: 2,000

SOUTH PALMER ROAD

Over: PARKING GARAGE

1 KM W OF RT. 185, Montgomery, MD

Built 1980 Load: 19.3 t ADT: 200

CLARA BARTON PARKW

Over: CABIN JOHN CREEK & CABIN

1.6 MILES SOUTH OF I-495., Montgomery, MD

Built 1963 Load: 20.0 t ADT: 16,120

STOKES ROAD

Over: STONEY CREEK

50M EAST OF E PALMER RD, Montgomery, MD

Built 1950 Load: 20.8 t ADT: 2,000

FALSTONE AVENUE

Over: LITTLE FALLS BRANCH

0.1 MI E OF WARWICK AVE, Montgomery, MD

Built 1965 Load: 20.9 t ADT: 50

PARKLAWN ENTRANCE

Over: ROCK CREEK

RT 28 SOUTH OF ROCKVILLE, Montgomery, MD

Built 1950 Load: 22.7 t ADT: 27

EDWARDS FERRY ROAD

Over: BROAD RUN

1 MI N OF WESTERLY ROAD, Montgomery, MD

Built 1982 Load: 24.0 t ADT: 312

EAST DEER PARK DRI

Over: CSXT RAILROAD

0.6 MILES EAST OF MD 355, Montgomery, MD

Built 1945 Load: 24.9 t ADT: 7,121

RIVER ROAD

Over: BROAD RUN

0.3 MI E OF ELMER SCHOOL, Montgomery, MD

Built 1911 Load: 25.4 t ADT: 444

US 29

Over: SLIGO CREEK

0.14 M S OF FRANKLIN AVE, Montgomery, MD

Built 1936 Load: 26.3 t ADT: 55,302

MD 396

Over: LITTLE FALLS BRANCH

0.69 MILE WEST OF WASH DC, Montgomery, MD

Built 1931 Load: 26.3 t ADT: 15,581

MD 97

Over: REDDY BRANCH

2.89 MILES S OF MD 650, Montgomery, MD

Built 1927 Load: 27.7 t ADT: 10,740

GAME PRESERVE ROAD

Over: WHETSTONE RUN

0.2 MI NORTH OF MD 355, Montgomery, MD

Built 1990 Load: 27.7 t ADT: 2,086

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