A slow-moving low pressure system was accompanied by unusually-high amounts of moisture, periods of steady of heavy rain, and some thunderstorms over north-central Montana during May 25th through the early morning of the 28th. In addition, relatively-high snow levels allowed rain to fall on lingering snowpack along the Rocky Mountain Front, where easterly upslope flow enhanced rainfall totals. Portions of the Rocky Mountain Front received as much as around 3 to 6 inches of total rainfall. Runoff from snowmelt and significant rainfall led to flooding along some rivers and overland flooding. The worst flooding was focused in the Augusta area, along the Sun River, and along Badger Creek in the Browning area.

Flood in JUDITH BASIN, MONTANA
From 27-MAY-19 07:00:00 to 27-MAY-19 07:00:00 (MST-7)
Location: UTICA
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Fergus County Sheriff reported flooding near Utica. Exact duration of flooding unknown.

Flood in TETON, MONTANA
From 26-MAY-19 09:00:00 to 26-MAY-19 09:00:00 (MST-7)
Location: BYNUM
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a portion of Teton Canyon Road had been washed-out by flooding along the North Fork of the Teton River. Exact duration of flooding unknown.

Flood in GLACIER, MONTANA
From 26-MAY-19 12:45:00 to 26-MAY-19 12:45:00 (MST-7)
Location: EAST GLACIER PARK
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

MT DOT reported floodwater on US-2, 3-miles west of East Glacier. Exact duration of flooding unknown.

Flood in CASCADE, MONTANA
From 27-MAY-19 08:50:00 to 27-MAY-19 08:50:00 (MST-7)
Location: SUN RIVER
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

MT DOT reported floodwater across MT-200 just east of the town of Sun River. In addition, NWS employees documented additional flooding along the Sun River, in and near the town of Sun River, on May 28th. Exact duration of flooding unknown.

Flood in LEWIS AND CLARK, MONTANA
From 26-MAY-19 15:00:00 to 26-MAY-19 15:00:00 (MST-7)
Location: AUGUSTA ARPT
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Lewis and Clark County Emergency Manager reported floodwater over roads in Augusta. In addition, at 3:15 PM MST, MT DOT reported US-287 was closed from Augusta to 1/2-mile south of Augusta due to floodwater across the roadway. Exact duration of flooding unknown.

Flood in CHOUTEAU, MONTANA
From 29-MAY-19 14:00:00 to 29-MAY-19 14:00:00 (MST-7)
Location: GENOU
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager shared video of flooded wheat field adjacent to the Teton River. Estimated time of the event. Exact duration of flooding unknown.

Flood in MEAGHER, MONTANA
From 27-MAY-19 09:05:00 to 27-MAY-19 09:05:00 (MST-7)
Location: MARTINSDALE
Flood cause: Heavy Rain / Snow Melt
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Meagher County Sheriff closed US-12 between Martinsdale and Two Dot Highway because of floodwater across the roadway. Floodwater was up to 4-feet deep. Exact duration of flooding unknown.