MAGNET S2 FLASH REPORT – FR
DTG: 260414-2100Z
SUMMARY
IMMINENT FAILURE RISK AT BIG FALLS DAM (WAUPACA CO WI). WATER OVERTOPPING/BYPASSING STRUCTURE. FLASH FLOOD WARNING ACTIVE. EVACUATIONS ONGOING DOWNSTREAM. LIFE-THREATENING RAPID FLOODING POSSIBLE IF FAILURE OCCURS. RESPONDERS ACTIVE.
BACKGROUND
HEAVY RAIN + REGIONAL FLOODING ELEVATED WATER LEVELS IN LITTLE WOLF + WOLF RIVER SYSTEMS.
BIG FALLS + MARION DAMS UNDER STRESS FROM HIGH FLOW.
EARTHEN STRUCTURES VULNERABLE TO EROSION IF OVERTOPPED.
DOWNSTREAM COMMUNITIES LOCATED IN FLOOD-PRONE CORRIDOR.
SITUATION
BIG FALLS DAM: IMMINENT FAILURE RISK, WATER FLOWING OVER/AROUND STRUCTURE.
NWS GREEN BAY: FLASH FLOOD WARNING ISSUED. RESIDENTS ADVISED MOVE TO HIGH GROUND IMMEDIATELY.
WAUPACA CO EM: ACTIVE RESPONSE, EVAC NOTIFICATIONS, FIELD MONITORING.
AFFECTED AREAS:
WEYAUWEGA / MANAWA / NEW LONDON / FREMONT / ROYALTON / SYMCO
PARTIAL EVACUATIONS: WEYAUWEGA LOW-LYING AREAS.
DOOR-TO-DOOR NOTIFICATIONS REPORTED.
MARION DAM: ALSO AT RISK.
IMPACTS:
- FLOODING (CLINTONVILLE AREA)
- SCHOOL CLOSURES
- ROAD CLOSURES
POP AT RISK: ~1500
COMMENTS / ASSESSMENT
THREAT LEVEL: HIGH / LIFE SAFETY
PRIMARY RISK: SUDDEN FLASH FLOODING IF DAM FAILS.
KEY FACTORS:
- ACTIVE OVERTOPPING
- POTENTIAL RAPID STRUCTURAL EROSION
- LIMITED WARNING TIME
- MULTIPLE DOWNSTREAM POP CENTERS
CASCADE RISKS:
- SECONDARY DAM FAILURE (MARION)
- ROAD/BRIDGE DAMAGE
- ACCESS LIMITATIONS
- STRANDED PERSONS
BOTTOM LINE: FAST-ONSET FLOOD THREAT. HIGHEST RISK IN LOW-LYING DOWNSTREAM AREAS.
MITIGATION RECOMMENDATIONS
RESIDENTS:
- EVAC LOW AREAS IMMEDIATELY
- MOVE TO HIGH GROUND
- AVOID FLOODED ROADS
- EXPECT POWER LOSS / LIMITED SERVICES
MONITOR:
- NWS ALERTS
- LOCAL EM UPDATES
- LOCAL MEDIA
OPERATIONS:
- TRACK DAM STATUS + RIVER LEVELS
- MONITOR EVAC ZONES
- IDENTIFY ROUTE BLOCKAGES
- PREP FOR BREACH SCENARIO
MAGNET GUIDANCE
TIME-SENSITIVE LIFE SAFETY EVENT.
PRIORITIES:
- RAPID WARNING DISSEMINATION
- SUPPORT EVAC COMPLIANCE
- MAINTAIN REAL-TIME AWARENESS
WATCH FOR:
- DAM BREACH CONFIRMATION
- SUDDEN WATER SURGE
- EXPANDED EVACS
- STRANDED PERSON REPORTS
SOURCE LIST
weather.gov/grb/
co.waupaca.wi.us/emergency_management
wbay.com
fox11online.com
nbc26.com
weather.gov/safety/flood
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