Storm Events Database

Event Details

Event Flood
-- Flood Cause Heavy Rain / Snow Melt
State IDAHO
County/Area NEZ PERCE
WFO OTX
Report Source Emergency Manager
NCDC Data Source CSV
Begin Date 2011-04-02 00:00:00.0 PST-8
Begin Location 3W NORTH LAPWAI
Begin Lat/Lon 46.45/-116.89
End Date 2011-04-03 23:59:00.0 PST-8
End Location 6S WANA
End Lat/Lon 46.14/-116.83
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 600.00K
Crop Damage 0.00K
Episode Narrative A stationary trough of low pressure off the Pacific Northwest Coast steered a deep fetch of subtropical moisture into the Idaho Panhandle which persisted from the end of March through April 7th bringing several rounds of heavy rain. Mild temperatures and breezy winds accompanying the subtropical moisture feed resulted in excessive mid-elevation snowmelt. The combination of heavy rainfall and excessive runoff resulted in sharp rises in most basins within the Idaho Panhandle. In addition, saturated soils became unstable in some locations resulting in debris flows. There were no injuries or reports of damage to residences or businesses however, significant damage was observed along transportation infrastructure within Bonner, Boundary, Lewis, Nez Perce, and Shoshone Counties as well as the Nez Perce Reservation.
Event Narrative Flooding of several creeks and streams resulted in damage, closures, and evacuations along numerous roads along with minor flooding of six homes. Roads that were damaged include Webb Road, McCormack Ridge Road, Garden Gulch Road near Highway 95, Cottonwood Creek Road, Flatiron Road, and Mission Creek Road near Highway 95. Reservation Line Road and Webb Canal Road were also closed for a short time due to flooding. The worst of the flooding occurred along Webb Creek which flooded several low-lying areas, including the junction with Highway 95 and the junction with McCormick Ridge Road where reports stated water covered the bridge at the junction of McCormick Ridge Road. The Web Store Smoke Shop was inundated with approximately one foot of water. Around six homes along Webb Road experienced flooding up to the homes foundations. Mission Creek also spilled out of its banks with water reported to be flowing down Mission Creek Road, over the Mission Creek Bridge, and into nearby pastures and front yards. Sweetwater Creek, Lapwai Creek and Cottonwood Creek also had minor flooding with the Spalding church suffering the greatest damage. A culvert was plugged along Lapwai Creek near the intersection of Highway 95 and Garden Gulch Road causing road damage and a two day road closure. A plugged culvert along Sweetwater Creek led to approximately 30 feet of pavement erosion along Flatiron Road and 1500 feet of ditch and shoulder erosion. The Emergency Manager of Nez Perce County estimated flood damage to the roads was around $74,000 with most of the damage along Flatiron Road and Garden Gulch Road near Highway 95. On the Nez Perce Indian Reservation, at least one septic tank was compromised due to flooding. The flooding caused basement flooding in at least four homes throughout the reservation. Two private bridges were destroyed or compromised and classified as unsafe for use.


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All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 2.475M 0.00K
CENTRAL PANHANDLE MOUNTAINS (Z... CENTRAL PANHANDLE MOUNTAINS (Z... ID 04/01/2011 00:00 PST-8 Landslide 0 0 0.00K 0.00K
CENTRAL PANHANDLE MOUNTAINS (Z... CENTRAL PANHANDLE MOUNTAINS (Z... ID 04/01/2011 00:00 PST-8 Landslide 0 0 75.00K 0.00K
KAMIAH LEWIS CO. ID 04/02/2011 00:00 PST-8 Flood 0 0 0.00K 0.00K
NORTH LAPWAI NEZ PERCE CO. ID 04/02/2011 00:00 PST-8 Flood 0 0 600.00K 0.00K
LEWIS AND SOUTHERN NEZ PERCE (... LEWIS AND SOUTHERN NEZ PERCE (... ID 04/02/2011 00:00 PST-8 Landslide 0 0 0.00K 0.00K
LEWIS AND SOUTHERN NEZ PERCE (... LEWIS AND SOUTHERN NEZ PERCE (... ID 04/02/2011 00:00 PST-8 Landslide 0 0 0.00K 0.00K
LEWISTON AREA (ZONE) LEWISTON AREA (ZONE) ID 04/02/2011 00:00 PST-8 Landslide 0 0 0.00K 0.00K
FERNWOOD BENEWAH CO. ID 04/02/2011 10:00 PST-8 Flood 0 0 0.00K 0.00K
LEWISTON AREA (ZONE) LEWISTON AREA (ZONE) ID 04/04/2011 19:00 PST-8 Landslide 0 0 0.00K 0.00K
MORAVIA BOUNDARY CO. ID 04/06/2011 00:00 PST-8 Flood 0 0 500.00K 0.00K
NORTHERN PANHANDLE (ZONE) NORTHERN PANHANDLE (ZONE) ID 04/06/2011 00:00 PST-8 Landslide 0 0 500.00K 0.00K
NORTHERN PANHANDLE (ZONE) NORTHERN PANHANDLE (ZONE) ID 04/06/2011 00:00 PST-8 Landslide 0 0 800.00K 0.00K
Totals: 0 0 2.475M 0.00K