A return to heavy mountain snows in late February and early March added significantly to the snow pack especially in the Upper Snake River Highlands and snow melt and heavy rains occurred sporadically from the middle of the month onward.   The worst of the flooding occurred in Clark and Madison which were both declared state disaster areas by the end of the month.   Low elevations in the central mountains also began to experience with extensive damage also occurring in Blaine County.

Flood in BLAINE, IDAHO
From 13-MAR-18 12:00:00 to 31-MAR-18 23:00:00 (MST-7)
Location: KETCHUM
Flood cause: Heavy Rain / Snow Melt
Property damage: 155.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Warmer temperatures caused rises in the Wood River and period of rain embedded as well and flooding began in Bellevue on March 13th.     Spruce Street in Bellevue flooded with Pero Road closed on the 15th.   By the 27th the following roads in Blaine County were all reported closed:    Democrat Gulch, Colorado Gulch, Road Canyon, Quigley, Muldoon Canyon, Rock Creek, Camp Creek, Croy Creek.   Two homes in the Warm Springs area flooded along with adjacent barns and buildings.   Estimated march damage in the county was seet at $155,000.

Flood in BUTTE, IDAHO
From 13-MAR-18 10:00:00 to 31-MAR-18 23:00:00 (MST-7)
Location: HOWE
Flood cause: Heavy Rain / Snow Melt
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Extensive sheet flooding caused extensive damage to county roads.

Flood in CARIBOU, IDAHO
From 13-MAR-18 12:00:00 to 31-MAR-18 23:00:00 (MST-7)
Location: BANCROFT
Flood cause: Heavy Rain / Snow Melt
Property damage: 65.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain added to snow melt to cause extensive sheet flooding in the Bancroft and Chesterfield areas with extensive damage to back roads which became unpassable.  Damage estimates in the county rose above 60 thousand dollars.

Flood in CLARK, IDAHO
From 13-MAR-18 05:00:00 to 31-MAR-18 23:00:00 (MST-7)
Location: KILGORE
Flood cause: Heavy Rain / Snow Melt
Property damage: 680.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Snow melt began in earnest with warmer temperatures combined with periods of heavy rain in the latter half of March.   This caused extensive sheet flooding in Clark County to the extent that the governor declared it a state of Idaho disaster area.    Several county roads received extensive damage and were washed away.   1 home in the Medicine Lodge area flooded completely along with hay bail damage and crop damage.   The Birch Creek Campground also had extensive damage with several campgrounds along the birch Creek washed away.   The county placed damage estimates close to 700 thousand dollars.

Flood in CUSTER, IDAHO
From 13-MAR-18 10:00:00 to 31-MAR-18 23:00:00 (MST-7)
Location: (U15)CHALLIS ARPT
Flood cause: Heavy Rain / Snow Melt
Property damage: 65.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Sheet flooding and minor ice jam flooding occurred throughout March as snow began to melt with the warmer temperatures along with periods of rain the latter half of the month.  County road and field damage occurred with damage estimates over 60 thousand dollars.

Flood in FREMONT, IDAHO
From 14-MAR-18 05:00:00 to 31-MAR-18 23:00:00 (MST-7)
Location: MACKS INN
Flood cause: Heavy Rain / Snow Melt
Property damage: 55.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Extensive flooding from snow melt and rain occurred in Fremont County.   A lot of the flooding came on the 22nd including extensive sand dune wash out at the Saint Anthony Sand Dunes.   Some damage to county roads occurred during the month with some field flooding as well.

Flood in MADISON, IDAHO
From 14-MAR-18 10:00:00 to 31-MAR-18 23:00:00 (MST-7)
Location: EDMONDS
Flood cause: Heavy Rain / Snow Melt
Property damage: 1.28M
Crop damage: 0.00K
Reported by: Emergency Manager

Extensive snow melt combines with heavy rains to create extensive sheet flooding problems in Madison County.   200 miles of county roads were washed out or damaged.   the worst of it came on March 22nd with heavy rains over the county.   The majority of the road damage was in the eastern part of the county.      The state of Idaho declared Madison County a disaster area on March 19th.   Damage estimates on mainly the roads by county officials exceeded one million dollars.   Rocky Hollow road was destroyed.