During severe floods in Puerto Rico, about 130 people died as a result of the deadliest single landslide on record in North America.

The 1985 Puerto Rico floods produced showers and thunderstorms across the island and the deadliest single landslide on record in North America, that killed at least 130 people in the Mameyes neighborhood of barrio Portugués Urbano in Ponce. The floods were the result of a westward-moving tropical wave that emerged off the coast of Africa on September 29. The system moved into the Caribbean Sea on October 5 and produced heavy rains across Puerto Rico, peaking at 31.67 in (804 mm) in Toro Negro State Forest. Two stations broke their 24-hour rainfall records set in 1899. The rains caused severe flooding in the southern half of Puerto Rico, which isolated towns, washed out roads, and caused rivers to exceed their banks. In addition to the deadly landslide in Mameyes, the floods washed out a bridge in Santa Isabel that killed several people. The storm system caused about $125 million in damage and 180 deaths, which prompted a presidential disaster declaration. The tropical wave later spawned Tropical Storm Isabel.