Click here to open the map in full screen. Another massive slide in 2013 on Whidbey Island sent a 1,000-foot-wide swath off a hillside cliff into the Ledgewood Beach development on the west side of the island. USGS scientists are conducting aerial overflights to collect photographs and monitor river channel evolution through the landslide. Some landslides may provide clues that they are about to happen; others may happen suddenly without any warning signs. Washington has seen several notable landslides in recent years. The spiders were placed on and near the landslide with helicopters.The USGS was also able to provide immediate data on water levels and river discharge from an existing permanent streamgage located downstream on the North Fork Stillaguamish River at Arlington. Use the interactive map below to see where landslide mapping has been completed, is ongoing, or is planned. All lanes of Interstate 5 in that area reopened Friday afternoon. MORE FROM FOX 13 WEATHER:DOWNLOAD:FOX 13Weather and News AppsWATCH:Forecast and RadarREAD:Closures and DelaysCHECK:Latest Weather AlertsandLive Traffic MapINTERACT:Submit your Weather PhotoDAILY BRIEF:Sign Up For Our NewsletterFOLLOW:Lisa Villegas,Erin Mayovsky, Brian MacMillan, Abby AconeandScott Sistek. Spiders contain high-precision GPS units for detecting landslide movement as well as geophones for detecting small vibrations. Slide on SR 109 both directions at MP 2 near Hoquiam South City Limits beginning at 9:15 pm on Jan. 6, 2022 until further notice. Immediately following the event, the USGS also installed three rapid-deployment gages and three buoys to measure flow, sediment, and lake levels. The Oso slide is a grim reminder about the complex nature of these slides and how fundamental ongoing efforts to understand them are to the health and security of the Nation. One is the shallow, or rapid landslide basically a debris flow that happens quickly. This is because water adds significant weight to the slope as it seeps into the ground and becomes groundwater. chevron_right Earthquakes. Erosion caused by loss of ground cover can lead to flash flooding. Please contact gs-haz_landslides_inventory@usgs.gov for more information on how to contribute additional inventories to this community effort.