Flood Fatalities: December 2003 Monthly Total: 17 Vehicle Related: 0
| Day | State | County | Gender | Age | Circumstances |
| 5 | HI | Island of Kauai | M | 56 | Hiker attempted to cross flooded low water crossing and swept away |
| 25 | CA | San Bernardino | ? | ? | 15 foot wall of water, mud, rocks and other debris swept down Waterman Canyon and struck campground. 2 cabins were destroyed. 14 persons perished. This area is surrounded by areas which had burned in the October fires. |
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| 25 | CA | San Bernardino | ? | ? | Levee broke near Devore resulting in a 12-foot high wall of water with rocks and other debris at around 6:00 PM on a campground along Lytle Creek, 2 persons perished. This area is surrounded by areas which had burned in the October fires. |
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