St. Mary's County, MD

50 public highway bridges

St. Mary's County Bridge Snapshot

St. Mary's County, Maryland contains 50 public highway bridges in the FHWA National Bridge Inventory. Roughly 26% are rated “Good,” 70% “Fair,” 4% “Poor,” and 4% 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.

50

Total Bridges

26%

Good

4%

Poor

4%

Structurally Deficient

Condition Distribution

Good

26% (13)

Fair

70% (35)

Poor

4% (2)

SD

4% (2)

All Bridges (50)

Sort:

CEDAR POINT RD

Over: HARPERS CREEK

0.7 MI N OF BRONSON RD, St. Mary's, MD

Built 1952 Load: 20.9 t ADT: 1,440

CEDAR POINT RD

Over: GOOSE CREEK

0.9 MI NE OF MACAULAY AVE, St. Mary's, MD

Built 1952 Load: 20.9 t ADT: 1,440

MD 5

Over: MOLL DYERS RUN

1.26 MILES S OF MD 244, St. Mary's, MD

Built 1937 Load: 27.7 t ADT: 12,500

MD 249

Over: ST GEORGES CREEK

0.46 MILE S OF STARK DR, St. Mary's, MD

Built 1957 Load: 28.1 t ADT: 1,530

MD 242

Over: TOMAKOKIN CREEK

0.71 MILE NORTH OF MD 238, St. Mary's, MD

Built 1936 Load: 29.9 t ADT: 5,491

MD 5

Over: MCINTOSH RUN

0.14 MILE SOUTH OF MD 243, St. Mary's, MD

Built 1935 Load: 31.3 t ADT: 22,220

MD 238

Over: NELSONS RUN

0.28 MILE SOUTH OF MD 234, St. Mary's, MD

Built 1929 Load: 32.7 t ADT: 1,791

MD 234

Over: NELSON RUN

0.43 MILE WEST OF MD 5, St. Mary's, MD

Built 1950 Load: 32.7 t ADT: 9,701

MD 242

Over: BR OF ST CLEMENTS CREEK

0.58 MILE SOUTH OF MD 5, St. Mary's, MD

Built 1951 Load: 33.1 t ADT: 2,431

MD 5

Over: ST MARYS RIVER

0.10 MILE NORTH OF MD 246, St. Mary's, MD

Built 1955 Load: 33.6 t ADT: 22,642

MD 5

Over: GLEBE RUN

0.11 MILE SOUTH OF MD 4, St. Mary's, MD

Built 1955 Load: 34.5 t ADT: 12,500

MD 5

Over: CHURCH CREEK

2.4 MILES SOUTH OF MD 584, St. Mary's, MD

Built 1936 Load: 34.5 t ADT: 4,400

MD 5

Over: FISHERMAN CREEK

0.31 MILE NORTH OF MD 584, St. Mary's, MD

Built 1936 Load: 35.4 t ADT: 7,244

MD 245

Over: BROOKS RUN

1.71 MILES S OF MD 235, St. Mary's, MD

Built 1950 Load: 35.4 t ADT: 8,324

PEGG ROAD

Over: BRANCH JARBOESVILLE RUN

.8 MI CHANCELLORS RUN RD, St. Mary's, MD

Built 1990 Load: 38.1 t ADT: 9,574

MD 471

Over: ST MARYS RIVER

0.36 MILE NORTH OF MD 5, St. Mary's, MD

Built 1932 Load: 39.0 t ADT: 4,242

DELABROOKE ROAD

Over: HORSE LANDING CREEK

2 MI E OF MD RTE 6, St. Mary's, MD

Built 1971 Load: 39.0 t ADT: 200

MD 234

Over: CHAPTICO CREEK

0.22 MILE WEST OF MD 238, St. Mary's, MD

Built 1959 Load: 39.5 t ADT: 8,121

MD 4

Over: KINGSTON CREEK

2.07 MILES N OF MD 235, St. Mary's, MD

Built 1980 Load: 43.1 t ADT: 26,801

MD 6

Over: LOCKS SWAMP CREEK

0.1 M W OF LAUREL VIEW LN, St. Mary's, MD

Built 1930 Load: 44.0 t ADT: 1,951

FENWICK STREET

Over: TOWN RUN

0.3 MILE NORTH OF MD 5, St. Mary's, MD

Built 1955 Load: 49.0 t ADT: 7,918

MD 244

Over: POPLAR HILL CREEK

0.16 M W OF TOWER HILL RD, St. Mary's, MD

Built 1938 Load: 53.5 t ADT: 2,517

MD 237

Over: JARBOESVILLE RUN

0.53 MILE NORTH OF MD 246, St. Mary's, MD

Built 2009 Load: 53.5 t ADT: 17,352

MD 238

Over: BURROUGHS RUN

1.49 MILES W OF MD 234, St. Mary's, MD

Built 1929 Load: 60.8 t ADT: 1,791

PEGG ROAD

Over: BRANCH JARBOESVILLE RUN

0.9 MI SOUTHWEST RT.235, St. Mary's, MD

Built 1995 Load: 62.6 t ADT: 4,891

MD 242

Over: LOCUST RUN

1.62 MILES SOUTH OF MD 5, St. Mary's, MD

Built 1929 Load: 76.2 t ADT: 2,371

MD 5

Over: EASTERN BRANCH

1.47 MILES N OF MD 489, St. Mary's, MD

Built 2016 Load: 82.3 t ADT: 10,000

MD 5

Over: ST CLEMENTS CREEK

0.72 MILE SOUTH OF MD 238, St. Mary's, MD

Built 1929 Load: 89.3 t ADT: 6,450

MD 4

Over: ST MARY'S RIVER

1.1 MILES SOUTH OF MD 235, St. Mary's, MD

Built 1974 Load: 99.9 t ADT: 18,051

MD 5

Over: TOWN RUN

0.36 MILE SOUTH OF MD 245, St. Mary's, MD

Built 1990 Load: 99.9 t ADT: 21,360

HURRY RD

Over: NELSONS RUN

0.2 MI S OF MD RTE 238, St. Mary's, MD

Built 2008 Load: 99.9 t ADT: 1,427

STONEY RUN DRIVE

Over: WAREHOUSE RUN

1 MI W OF FLAT IRON ROAD, St. Mary's, MD

Built 1995 Load: 99.9 t ADT: 478

WILDEWOOD PARKWAY

Over: UNNAMED STREAM

.9 MI W OF WILDEWOOD BLVD, St. Mary's, MD

Built 1995 Load: 99.9 t ADT: 5,900

GREENS CROSSING CO

Over: CRANEY CREEK

0.6 MI E. OF FLAT IRON RD, St. Mary's, MD

Built 2009 Load: 99.9 t ADT: 603

WILDEWOOD DR.

Over: UNNAMED TRIBUTARY

0.2 M S OF WILDEWOOD PKWY, St. Mary's, MD

Built 2010 Load: 99.9 t ADT: 1,024

DOCTOR JOHNSON ROA

Over: ST. CLEMENTS CREEK

0.9 MI W OF MD RTE 242, St. Mary's, MD

Built 1975 Load: 26.3 t ADT: 880

MD 234

Over: BUDDS CREEK

ON CHARLES CO LINE, St. Mary's, MD

Built 1960 Load: 32.7 t ADT: 6,221

MD 242

Over: DYNARD RUN

0.86 MILE SOUTH OF MD 234, St. Mary's, MD

Built 1960 Load: 32.7 t ADT: 5,491

MD 471

Over: ST. MARY'S RIVER

1.01 MILES NORTH OF MD 5, St. Mary's, MD

Built 1990 Load: 32.7 t ADT: 4,242

MD 242

Over: ST CLEMENTS CREEK

0.52 MILE NORTH OF MD 234, St. Mary's, MD

Built 2000 Load: 36.7 t ADT: 2,371

MCINTOSH ROAD

Over: MCINTOSH RUN

0.9 MI N OF MD RTE 245, St. Mary's, MD

Built 1984 Load: 43.5 t ADT: 2,500

MECHANICSVILLE RD

Over: CHAPTICO CREEK

0.7 MI N OF MD RTE 234, St. Mary's, MD

Built 2011 Load: 44.4 t ADT: 2,876

MD 234

Over: ST CLEMENTS CREEK

0.28 MILE EAST OF MD 242, St. Mary's, MD

Built 1950 Load: 54.9 t ADT: 9,701

MD 244

Over: MOLL DYERS RUN

1.21 MILES WEST OF MD 5, St. Mary's, MD

Built 1925 Load: 63.0 t ADT: 2,190

BEN OAKS DRIVE

Over: PERSIMMON CREEK

0.4 M NE OF MD 235, St. Mary's, MD

Built 2009 Load: 74.4 t ADT: 978

MD 470

Over: TOMAKOKIN CREEK

0.88 MILE SOUTH OF MD 242, St. Mary's, MD

Built 1997 Load: 81.6 t ADT: 1,162

MD 6

Over: PERSIMMON CREEK

2.44 MILES W OF MD 235, St. Mary's, MD

Built 2021 Load: 88.5 t ADT: 4,200

MD 5

Over: BRANCH OF MCINTOSH RUN

.652 MILE SOUTH OF MD 243, St. Mary's, MD

Built 2017 Load: 99.9 t ADT: 22,220

CORNFIELD HARBOR D

Over: POINT LOOKOUT CREEK

1 Mile South of SR 5, St. Mary's, MD

Built 1970 Load: 15.0 t ADT: 150

MD 5

Over: HILTON RUN

1.86 MILES N OF MD 489, St. Mary's, MD

Built 1936 Load: 33.1 t ADT: 8,010

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