Flash Flood Watch

Please Note Report Date

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Note:  Be sure to pay close attention to the date and time of each warning.    
This document contains all warnings in the state so please read the
complete document.
 
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WGUS65 KMSO 150322

FFAMSO



URGENT - IMMEDIATE BROADCAST REQUESTED

Flood Watch

National Weather Service Missoula MT

822 PM MST Sun Dec 14 2025



MTZ001-172100-

/O.NEW.KMSO.FF.A.0003.251215T0322Z-251217T2100Z/

/00000.0.DM.000000T0000Z.000000T0000Z.000000T0000Z.OO/

Kootenai/Cabinet Region-

822 PM MST Sun Dec 14 2025



...FLASH FLOOD WATCH FOR THE POTENTIAL FAILURE OF LOWER FLOWER CREEK 

DIVERSION STRUCTURE IN EFFECT THROUGH WEDNESDAY AFTERNOON...



* WHAT...Flash Flooding caused by a potential failure of the Lower 

  Flower Creek Diversion Structure related to additional rainfall 

  early this week.

  Officials are currently working to mitigate this potential hazard 

  by releasing additional water to take pressure off the diversion 

  structure; these water flows are expected to stay below peak 

  levels during the flood event last Thursday.



* WHERE...Libby, MT. 



* WHEN...Through Wednesday afternoon.



* IMPACTS...A failure of the diversion structure may result in 

  flooding of urban areas.



* ADDITIONAL DETAILS...

  - Recent heavy rain caused damage to the Lower Flower Creek

    Diversion Structure. Forecast rainfall has the potential to

    cause additional damage to the structure, bringing the risk

    for uncontrolled water released into the town of Libby.  The

    main Flower Creek Dam is stable and functioning as designed.

  - https://www.weather.gov/mso/hydrology



PRECAUTIONARY/PREPAREDNESS ACTIONS...



You should monitor later forecasts and be prepared to take action 

should Flash Flood Warnings be issued.



Please consult local emergency officials for specific areas prone to 

flooding if the diversion structure fails.



&&



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