Washington State Department of Ecology
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La Nina Winter, 1998 -1999  
 
The winter of 1998-1999 brought La Nina. The three month period between November and January were the wettest on record. As a result, groundwater levels were high and the region witnessed the reactivation of numerous large deep-seated landslides. These were generally slow-moving and occurred within existing landslide complexes that had been previously identified.
 
Landslide scarp near US 101.
Landslide scarp in driveway on slope above US 101 on Hood Canal.
Fissure in road, Jefferson County.
Slide movement on road near Hood Canal, Jefferson County.