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 March 29th through early April. This resulted in several rounds of moderate to heavy precipitation, which primarily fell as rain below 6000 feet.  Mild temperatures and breezy winds accompanying the subtropical moisture feed resulted in excessive mid-elevation snowmelt.  The combination of heavy rainfall and excessive snow melt resulted in sharp rises in most basins within the Central Idaho Panhandle and Idaho Palouse.   In addition, saturated soils became unstable in some locations resulting in debris flows.

Flood in KOOTENAI, IDAHO
From 30-MAR-11 12:00:00 to 31-MAR-11 23:59:00 (PST-8)
Location: HAUSER
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Excessive runoff into Hauser Lake caused the lake to expand out of its banks flooding portions of Hauser Lake Road between Matheson and Ragged Ridge roads.

Flood in LATAH, IDAHO
From 31-MAR-11 08:00:00 to 31-MAR-11 23:59:00 (PST-8)
Location: PRINCETON
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

North Latah County Road Department reported water over portions of Hatter Creek Road.

Flood in BONNER, IDAHO
From 31-MAR-11 00:00:00 to 31-MAR-11 23:59:00 (PST-8)
Location: ELMIRA
Flood cause: Heavy Rain / Snow Melt
Property damage: 1.79M
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager of Bonner County relayed numerous road damage reports from across the county due to flooding from March 31st.  The roads included in this report were Fish Creek, Sandborn Creek, West Shingle Mill, Bottle Bay, Dufort, Peninsula, Eastriver, Blacktail, Beare, Eureka, Helen Thompson, Moore Loop, South First Street, Spring Haven Drive, Wells, North Riley Creek, Mountain Creek, Snow Valley, Forest Siding, Comeback Lane, Cocolalla Loop, and LeClerc Road.  Several other private roads were also damaged from flooding.

Flood in LATAH, IDAHO
From 31-MAR-11 20:00:00 to 31-MAR-11 23:23:00 (PST-8)
Location: HOWELL
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

North Latah County Road Department reported water over roadways along portions of Randle Flat Creek Road and Driscoll Ridge Road near Troy, Idaho.

Debris Flow in CENTRAL PANHANDLE MOUNTAINS, IDAHO
From 30-MAR-11 12:00:00 to 31-MAR-11 23:59:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Two large debris flows occurred around noon along Forest Road 208. The first slide was near the intersection of Lost Creek.  The second slide was near the intersection of Clee Circle Road.  No injuries were reported however 14 residents were trapped due to impassible roads and two of these residents had to be evacuated by the sheriff for medical appointments.  The road blocked access to six permanent residences.  There was an estimated 25,000 cubic yards of rock and mud over the road with the larger slide and 8000 cubic yards associated with the smaller slide.  The debris slide was still sliding the first week of April.  The estimated cost to remove the earth and fix any damage to the road was 330 thousand dollars.

Flood in SHOSHONE, IDAHO
From 30-MAR-11 11:00:00 to 30-MAR-11 14:00:00 (PST-8)
Location: ENAVILLE
Flood cause: Heavy Rain / Snow Melt
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A culvert measuring 24 inches in diameter and 50 feet in length became plugged allowing water to run over Old Coeur D Alene River Road.  The water washed out some of the shoulder and road surface.  The culvert was severely damaged and will need to be replaced.