The top map below shows recent burn areas considered vulnerable in flash flood conditions. The bottom map shows specific canyons in Tujunga, Glendale, La Crescenta and La Cañada Flintridge at risk for mudslides during heavy rainfall. For up-to-date information on the foothill neighborhoods, visit the Times' L.A. Now blog.
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Recent burn areas in the Los Angeles area considered vulnerable in flash flood conditions
View Fire perimeters 2008-09 at risk for mudslides and flash floods in a larger map
Map key
  Fire perimeter       Areas at risk for mudslides       Start of fire    
  Major canyons in the Angeles National Forest at risk for mudslides    
  Los Angeles County Fire Stations where residents can pick up free sandbags    
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Canyon areas under threat of mudslides in heavy rain
View Los Angeles area mudslide danger map - Los Angeles Times in a larger map

Click on icons and lines, and an informational bubble will pop up. The star icons represent areas considered by the U.S. Geological Survey to be at risk for mudslides in the worst-case scenario. Under this scenario, a rainstorm would last 12 hours, striking when debris-retention basins are already full. Such a storm occurs about once every two years. Mudslides can also occur with less rain when basins are not full. The red fire perimeter shows the boundaries of previous fires.

Zoom in and zoom out using the (+) and (-) buttons in the top left-hand corner. Trouble with the map? Try restarting your browser or your computer.