Heavy rain fell in southern Maryland during the night of May 17th into the morning hours of the 18th. 1-4 inches of rain caused flooding, including of streams. More moderate to heavy rain continued in that area on the 18th and 19th, prolonging some flooding in Saint Mary's County. Meanwhile, the cumulative effects of several days of rain throughout the region caused stream flooding, particularly on the Potomac River.

Flood in CHARLES, MARYLAND
From 18-MAY-18 05:50:00 to 18-MAY-18 08:00:00 (EST-5)
Location: WAYSIDE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Mill Run Road reported flooded and closed at Mill Run near Route 257.

Flood in CHARLES, MARYLAND
From 18-MAY-18 06:19:00 to 18-MAY-18 08:00:00 (EST-5)
Location: NEWTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Springhill Newtown Road reported flooded and closed in the vicinity of Clark Run south of La Plata.

Flood in ST. MARY'S, MARYLAND
From 18-MAY-18 08:00:00 to 18-MAY-18 10:00:00 (EST-5)
Location: BUSHWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Bushwood Road reported flooded and closed near Tomakokin Creek.

Flood in ANNE ARUNDEL, MARYLAND
From 18-MAY-18 08:10:00 to 18-MAY-18 10:00:00 (EST-5)
Location: RIVA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Central Avenue (Maryland Route 214) reported flooded and closed at the Beards Creek crossing near Riva.

Flood in ANNE ARUNDEL, MARYLAND
From 18-MAY-18 08:10:00 to 18-MAY-18 10:00:00 (EST-5)
Location: CROFTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Maryland Route 450 reported closed due to flooding near North River at Rutland Road.

Flood in ST. MARY'S, MARYLAND
From 18-MAY-18 08:27:00 to 18-MAY-18 10:30:00 (EST-5)
Location: LEONARDTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Maryland Route 243 reported flooded and closed in Leonardtown at Nelson Run.

Flood in ST. MARY'S, MARYLAND
From 18-MAY-18 09:15:00 to 19-MAY-18 08:35:00 (EST-5)
Location: GREAT MILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on Saint Mary's River near Great Mills exceeded the 6 foot flood stage during the indicated times. The peak value observed was 8.33 feet at 5:30pm EST on May 18th. At the levels observed, flooding occurs on multiple roadways near Great Mills.

Flood in CHARLES, MARYLAND
From 18-MAY-18 09:40:00 to 18-MAY-18 11:30:00 (EST-5)
Location: NEWPORT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Stines Store Road and Newport Church Road are both reported flooded and closed in the area of Murphy Run and Newport Run near Wicomico.

Flash Flood in ST. MARY'S, MARYLAND
From 19-MAY-18 13:41:00 to 19-MAY-18 15:15:00 (EST-5)
Location: GREAT MILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on Saint Mary's River at Great Mills rapidly exceeded the flood stage of 6 feet during the time indicated. Road flooding occurred in the area.

Flood in ST. MARY'S, MARYLAND
From 19-MAY-18 15:15:00 to 20-MAY-18 01:03:00 (EST-5)
Location: GREAT MILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Following a rapid rise above flood stage, the Saint Mary's River at Great Mills remained above flood stage during the time indicated. Flat Iron Road and other area roads were flooded. The peak level observed was 7.90 feet at 8:45pm on May 19th.

Flood in PRINCE GEORGE'S, MARYLAND
From 17-MAY-18 23:40:00 to 20-MAY-18 02:07:00 (EST-5)
Location: UPPER MARLBORO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on Western Branch at Upper Marlboro exceeded the 11 foot flood stage during the indicated times. The peak level observed was 12.75 feet at 3:40pm EST on May 18th. Water Street and portions of Marlboro Race Track Road were both flooded.

Flood in MONTGOMERY, MARYLAND
From 18-MAY-18 19:00:00 to 21-MAY-18 14:10:00 (EST-5)
Location: POOLESVILLE
Flood cause: Heavy Rain
Property damage: 0.10K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on the Potomac River at Edwards Ferry exceeded the 15 foot flood stage during the times indicated. The peak level of 17.87 feet was observed at 12:15pm EST on May 20th. Low-lying areas near Whites Ferry were covered by water, along with the boat ramp and lower parking area at Edwards Ferry. Near the time of peak flow, water entered the store at Whites Ferry.

Flood in FREDERICK, MARYLAND
From 19-MAY-18 16:45:00 to 21-MAY-18 00:34:00 (EST-5)
Location: BRUNSWICK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on the Potomac River at Point of Rocks exceeded the 16 foot flood stage during the indicated times. The peak level of 17.39 feet occurred at 11:00am EST on May 20th. The Brunswick campground, parts of the C and O Canal, the lower parking lot of the Point of Rocks boat ramp, and the parking lot of the Brunswick and Nolands Ferry boat ramps all flooded.

Flood in CHARLES, MARYLAND
From 18-MAY-18 06:10:00 to 18-MAY-18 08:00:00 (EST-5)
Location: WAYSIDE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Shiloh Church Road reported flooded and closed near Ditchley Prong in the Newburg area.