Heavy rain caused poor drainage flooding in New Jersey and stream and river flooding mainly in west central and northern New Jersey. Major flooding occurred again in sections of the Passaic River Basin.  The rain began during the morning of the 16th and fell at its heaviest during thunderstorms on the evening of the 16th. The rain ended during the early morning of the 17th. Precipitation totals averaged 2.0  to 4.0 inches along the Interstate 95 corridor and Morris County and generally 1 to 2 inches elsewhere in New Jersey.
The heavy rain was caused by a deep low pressure system that emerged from the Rockies on the 14th and moved northeast and reached the Great Lakes on the morning of the 16th and then north into Canada that evening. A strong high pressure system preceded it across southeast Canada and both pumped considerable moisture into the region from the Gulf of Mexico and the Atlantic Ocean. The rain ended shortly after the low's occluded front moved through Pennsylvania.

Flood in BURLINGTON, NEW JERSEY
From 17-APR-11 00:00:00 to 17-APR-11 19:00:00 (EST-5)
Location: HARTFORD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Flooding along Parkers Creek in Mount Laurel Township forced the closure of Union Mill Road. The heavy rain also caused basement flooding of homes on Oregon Trail in Medford Township. Event precipitation totals included 2.89 inches in Mount Laurel, 2.79 inches in Lumberton, 2.78 inches in Westampton, 2.61 inches in Medford, 2.50 inches in Wrightstown, 2.46 inches in Moorestown, 2.43 inches in Southampton, 2.33 inches in  Medford Lakes and 2.32 inches in Burlington.

Flood in HUNTERDON, NEW JERSEY
From 16-APR-11 23:25:00 to 17-APR-11 01:57:00 (EST-5)
Location: SUNNYSIDE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The South Branch of the Raritan River at Stanton was above its 8 foot flood stage from 1225 a.m. EDT through 257 a.m. EDT on the 17th. It crested at 8.17 feet at 145 a.m. EDT. Event precipitation totals included 3.10 inches in Wertsville 3.10 and Ringoes, 2.79 inches in Readington, 2.57 inches in Flemington, 2.55 inches in Lebanon, 2.40 inches in Clinton, 2.33 inches in Stockton, 2.20 inches in High Bridge and 1.89 inches in Bethlehem.

Flood in MIDDLESEX, NEW JERSEY
From 17-APR-11 03:13:00 to 17-APR-11 06:40:00 (EST-5)
Location: MIDDLESEX
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

In addition to poor drainage flooding, both the Raritan River (moderate flooding) and Bound Brook (minor flooding) flooded. The Raritan River at Bound Brook in Somerset County crested at 31.1 feet. Flood stage is 28 feet. The Bound Brook at Middlesex was above its 9 foot flood stage from 413 a.m. EDT through 740 a.m. EDT on the 17th. It crested at 9.27 feet at 6 a.m. EDT. Event precipitation totals included 2.83 inches in Iselin, 2.62 inches in South Brunswick, 2.54 inches in Deans, 2.32 inches in Cranbury and 2.28 inches in New Brunswick.

Flood in SOMERSET, NEW JERSEY
From 16-APR-11 20:58:00 to 19-APR-11 04:22:00 (EST-5)
Location: NORTH PLAINFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The heavy rain caused poor drainage flooding as well as minor to moderate flooding along numerous streams and rivers in Somerset County. Mainly moderate flooding occurred along both the Millstone and Raritan Rivers. Major flooding occurred along the Millstone River at Griggstown. Early in the morning on the 17th, in Hillsborough Township, a man had to be rescued after he drove into four feet of water at the Basilone Memorial Bridge which crosses the Raritan River.
The North Branch of the Raritan River at North Branch was above its 12.3 foot flood stage from 106 a.m. EDT through 851 a.m. EDT on the 17th. It crested at 14.40 feet at 515 a.m. EDT. Farther downstream, the North Branch of the Raritan River at Raritan was above its 10 foot flood stage from 230 a.m. EDT through 1005 a.m. EDT on the 17th. It crested at 11.15 feet at 630 a.m. EDT. The South Branch of the Raritan River at South Branch was above its 7 foot flood stage from 958 p.m. EDT on the 16th through 252 p.m. EDT on the 17th. It crested at 11.55 feet at 515 a.m. EDT on the 17th. Along the main stem of the Raritan River at Manville, the river was above its 14 foot flood stage from 428 a.m. EDT through 712 p.m. EDT on the 17th. It crested at 17.25 feet at 11 a.m. EDT. Farther downstream, the Raritan River at Bound Brook was above its 28 foot flood stage from 754 a.m. through 1040 p.m. EDT on the 17th. It crested at 31.1 feet at 230 p.m. EDT.
The Millstone River at Griggstown had major flooding and was above its 10 foot flood stage from 1144 p.m. EDT on the 16th through 522 a.m. EDT on the 19th. It crested at 15.67 feet at 330 p.m. EDT on the 17th. Farther downstream, the Millstone River at Blackwells Mills was above its 9 foot flood stage from 544 a.m. EDT on the 17th through 337 p.m. EDT on the 18th. It crested at 12.59 feet at 4 p.m. EDT on the 17th. Farther downstream, the Millstone River at Weston was above its 12.4 foot flood stage from 811 a.m. EDT through 739 p.m. EDT on the 17th. It crested at 13.82 feet at 1245 p.m. EDT on the 17th. The Pike Run at Belle Mead was above its 7 foot flood stage from 1013 p.m. EDT on the 16th through 448 a.m. EST on the 17th. It crested at 8.87 feet at 115 a.m. EDT on the 17th. The Bound Brook at Middlesex  (Middlesex County) was above its 9 foot flood stage from 413 a.m. EDT through 740 a.m. EDT on the 17th. It crested at 9.27 feet at 6 a.m. EDT.
Event precipitation totals included 3.48 inches in Neshanic, 3.00 inches in Martinsville, 2.91 inches in Hillsborough and Bernards, 2.90 inches in Bound Brook, 2.76 inches in Skillman, 2.74 inches in Franklin, 2.68 inches in Montgomery, 2.49 inches in Bridgewater, 2.37 inches in Somerville and 2.25 inches in Blackwells Mills.

Flood in MERCER, NEW JERSEY
From 16-APR-11 23:09:00 to 17-APR-11 07:42:00 (EST-5)
Location: EAST TRENTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

In addition to urban and poor drainage flooding, minor to moderate flooding occurred along the Assunpink Creek and Stony Brook.  The Stony Brook at Princeton was above its 10 foot flood stage from 209 a.m. EDT through 741 a.m. EDT on the 17th. It crested at 10.54 feet at 445 a.m. EDT. The Assunpink Creek in Trenton was above its 8.5 foot flood stage from 1209 a.m. EDT through 842 a.m. EDT on the 17th. It crested at 9.65 feet at 5 a.m. EDT.  Event precipitation totals included 3.03 inches in Lawrence, 2.85 inches in Pennington, 2.74 inches in Hightstown, 2.65 inches in Ewing, 2.51 inches in Robbinsville, 2.48 inches in Hamilton and Princeton and 2.38 inches in Trenton.

Flood in MORRIS, NEW JERSEY
From 16-APR-11 19:40:00 to 22-APR-11 04:00:00 (EST-5)
Location: GREEN POND
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain caused poor drainage and river flooding in Morris County. Moderate to major flooding occurred along the Passaic and Pompton Rivers, although the crests were not as high as they were in March. The renewed flooding along the Pompton and Passaic Rivers forced the evacuations of 10 residents in Lincoln Park and three families in Pequannock. About 100 homeowners in Pequannock were told to evacuate. About 30 homes were damaged by the Pompton River within the township. New Jersey State Route 23 was also closed in Pequannock.
The Passaic River at Chatham was above its 6 foot flood stage from 1028 p.m. EDT on the 16th through 322 a.m. EDT on the 17th. It crested at 6.34 feet at 100 a.m. EDT on the 17th. Farther downstream, the Passaic River at Pine Brook was above its 19 foot flood stage from 500 p.m. EDT on the 17th through 915 p.m. EDT on the 20th. It crested at 20.09 feet at 1245 a.m. EDT on the 19th. Farther downstream, the Passaic River at Circle Burners or Lincoln Park was above its 6 foot flood stage from about 2 p.m. EDT on the 18th through 5 a.m. EDT on the 22nd. It crested at 8.33 feet at 1140 p.m. EDT on the 18th.
The Pompton River at Pompton Plains was above its 16 foot flood stage from 207 a.m. EDT on the 17th through 535 p.m. EDT on the 18th. It crested at 19.84 feet at 130 p.m.EDT on the 17th. Farther downstream, the Pompton River at Ryerson Road was above its 12 foot flood stage from 357 a.m. EDT on the 17th through 917 p.m. EDT on the 20th. It crested at 16.41 feet at 1020 p.m. EDT on the 17th. Farther downstream, the Pompton River at Midwood was above its 7.5 foot flood stage from 335 a.m. EDT on the 17th through 122 a.m. EDT on the 22nd. It crested at 12.40 feet at 1205 a.m. EDT on the 18th.  Farther downstream, the Pompton River at the Mountainview Bridge was above its 8 foot flood stage from 1017 a.m. EDT on the 17th through 921 a.m. EDT on the 21st. It crested at 10.84 feet at 250 a.m. EDT on the 18th.

The East Ditch at Beaver Brook Road was above its 2.5 foot flood stage from 840 p.m. EDT on the 16th through 823 p.m. EDT on the 17th. It crested at 4.18 feet at 450 a.m. EDT on the 17th. The Rockaway River above the Boonton Reservoir was above its 5 foot flood stage from 251 a.m. EDT on the 17th through 825 a.m. EDT on the 18th. It crested at 6.23 feet at 11 a.m. EDT on the 17th. The Rockaway River below the Boonton Reservoir was above its 5 foot flood stage from 618 a.m. EDT on the 17th through 222 a.m. EDT on the 19th. It crested at 6.75 feet at 430 p.m. EDT on the 17th. The Whippany Creek at Morristown was above its 6 foot flood stage from 1208 a.m. EDT through 707 am EDT on the 17th. It crested at 6.2 feet at 1230 a.m. EDT on the 17th. The Pequannock River at the Macopin Dam was above its 5.5 foot flood stage from 1218 a.m. EDT on the 17th through 1007 a.m. EDT on the 18th. It crested at 5.73 feet at 745 a.m. EDT on the 17th.
Event precipitation totals included 3.82 inches in Butler, 3.81 inches in Milton, 3.60 inches in Rockaway, 3.26 inches in Morris, 3.14 inches in Chatham, 3.10 inches in Harding, 3.09 inches in Denville, 2.91 inches in Mine Hill and Randolph, 2.90 inches in Long Valley, 2.88 inches in Boonton and 2.84 inches in Long Hill.

Flood in GLOUCESTER, NEW JERSEY
From 17-APR-11 02:41:00 to 17-APR-11 09:52:00 (EST-5)
Location: MULLICA HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

In addition to the tidal flooding along the Delaware River, the heavy rain caused the Raccoon Creek to flood inland. The Raccoon Creek near Swedesboro was above its 13 foot flood stage from 341 a.m. EDT through 1052 a.m. EDT on the 17th. It crested at 13.34 feet at 6 a.m. EDT. Event precipitation totals included 1.94 inches in Franklin.