Flood in Idaho, May 2 to 5, 1999

Name: Flood in Idaho, May 2 to 5, 1999
Start: 1999-05-02T10:00
End: 1999-05-05T00:30
Location: Idaho

May 2 to 5, 1999 · NWS PIH · 1 event in 1 county or zone

6 feet causing some lowland flooding of pasture and entered low lying areas of Beaver Dick State Park.

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS PIH wrote it up.

The Henry's Fork of the Snake River exceded flood stage of 9.5 feet and crested at 9.6 feet causing some lowland flooding of pasture and entered low lying areas of Beaver Dick State Park.

Event by event

1 flood. Local standard time, as filed.

Flood, Upper Snake River Plain

When: May 2, 10:00 AM MST to May 5, 12:30 AM MST
Where: Upper Snake River Plain forecast zone
Reported by: EMERGENCY MANAGER

What these are

Flood: Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Idaho in 1999 Every state in 1999 This day in weather history Warnings in Idaho, May 1999

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5694255.