Mudflow 2025 - Resources and Information

Mudflow Information
Posted on 02/13/2025
Mudflow and Debry

**UPDATE** 2/20/2025

Temporary Parking Restrictions & Service Changes

Canyon Crest Drive – No Street Parking
Effective immediately: No street parking from 7:30 AM to 4:30 PM, seven days a week, for approximately two months.

Necessary for heavy equipment access to remove 80,000 to 100,000 cubic yards of sediment and debris from behind the Sierra Madre Dam.

Other Parking Restrictions & Temporary Closures

  • All other "No Street Parking" orders have been lifted.
  • However, streets may be intermittently closed for additional cleanup and water leak repairs.

County Crews will also clear and maintain all Sierra Madre debris basins, but no additional parking restrictions are required at this time.

Resident Access & Traffic Control

  • County personnel will assist residents with accessing and leaving their homes during operations.
  • All persons in the area, whether in vehicles or walking, must follow the directions of County traffic control staff.
Private Property Mud & Debris Removal

To clarify the level of assistance available to residents dealing with mud and debris accumulation on private property:

  • City Public Works crews will NOT enter private property to remove mud and debris.
  • Residents will have a designated number of days to move storm-related mud and debris to the street for removal by heavy equipment.
  • Household and landscaping waste are NOT permitted in debris piles for removal.

Debris Removal Timeline

  • The timeframe for removal will be determined based on the severity of the storm event and will account for weekends and holidays to allow residents sufficient time.
  • The specific number of days will be announced as soon as possible following a storm event or series of events.

Stormwater Quality Regulations

  • Once street sweeping or washing has occurred, additional deposits of mud or debris on the street are prohibited under stormwater regulations and may result in fines.
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Key Actions to Take Now:

Stay informed - Sign up for emergency alerts. 
Know your evacuation zone - Use the Genasys Protect App. 
Prepare your home Secure property and access mitigation resources. 


Evacuation & Emergency Notifications

Some areas may require evacuation. Be ready and monitor updates.

How to Check Your Evacuation Status:

Genasys Protect App

Genasys App

  • Provides real-time, zone-based alerts regarding evacuation orders and warnings.
  • Find your zone: Search Your Zone Here
    • Enter your address in the search bar.
    • Press Enter or click the search icon.
    • Your zone ID and status will appear on the map.
  • Download the app:

Sign Up for Nixle Alerts
The City of Sierra Madre sends emergency notifications via Nixle Alerts, delivering trusted updates directly from the Sierra Madre Police Department.

  • Text your ZIP CODE to 888777 for real-time emergency alerts.
  • Register online to receive email and text notifications.

Mudflow Mitigation Efforts

The City of Sierra Madre, in partnership with Los Angeles County, is actively working to reduce mudflow risks. Current efforts include:

  • Strategic K-rail placement to divert mudflows.
  • Debris removal from roadways and storm drains.
  • Sandbag distribution to residents.

Need property-specific mudflow mitigation advice?
Call the LA County Mudflow Hotline at 1-800-933-0930.


City & County Response Efforts

Public Works Coordination:

  • Daily meetings with LA County officials to assess key impact areas and coordinate response efforts.
  • Storm drains and debris basins inspected and cleared as needed.
  • Sierra Madre Dam debris basin cleared – 2,500 truckloads of debris removed.
  • Over 500 feet of K-rail installed based on past fire and mudflow data.
  • Thousands of sandbags distributed (pre-filled and empty).

Evacuation Planning & Safety Measures

If an evacuation is ordered, leave promptly.
Plan ahead – Have a go-bag ready with essential items:

  • Important documents
  • Medications
  • Basic supplies

Check on neighbors and assist them in preparing.

Emergency Response Limitations

  • Fire, Police, and Public Works crews will NOT enter areas experiencing active mudflows.
  • If you choose to stay under an evacuation order, you must shelter in place until emergency crews can safely enter.

Additional Resources

To help residents understand mudflow risks and prepare for potential hazards, the following resources are available:

Watershed Emergency Response Team (WERT) Report– Comprehensive assessment of post-fire hazards and debris flow potential.

Eaton Fire Evacuation Map – Los Angeles County Public Works evacuation zones and at-risk areas.

Homeowner's Guide for Flood, Debris, and Erosion Control – Detailed guidance from LA County Public Works on protecting properties from flooding and debris flows.

Request Engineering Advice – Submit a request for property-specific engineering advice related to mudflow concerns.

Debris and Mudflow Potential ForecastThe debris and mudflow potential forecast is based upon a review of watershed conditions and weather forecasts from the National Weather Service and other weather predicting sources. It represents conditions within the watershed that could lead to debris and mudflow events. Debris and mudflows are highly unpredictable events.


Stay Updated

Genasys Protect App – Evacuation orders & real-time alerts.
Nixle Alerts– Citywide emergency notifications.
City of Sierra Madre Instagram – Latest updates & resources.

For more information, contact Sierra Madre Public Works at (626) 355-7135.

Stay informed, be prepared, and take action to protect your home and community!