A very wet and slow-moving low pressure system stalled over Montana and directed near-continuous rainfall over central and northeastern portions of the state for several days.  Rainfall totals ranged from 5 to 10 inches in the affected area.
Valley County damages reported by DES to FEMA were in excess of $1.12 million dollars including the cost of repairs and labor.  There were 36 locations across Valley County that were damaged (road, bridge and culverts).
Petroleum County damages reported by DES to FEMA were at $515,000 with 30 locations around the county having damage (road, bridge and culverts).
On October 9th, 2014 a presidential disaster declaration was granted for this event.

Flood in VALLEY, MONTANA
From 24-AUG-14 15:01:00 to 29-AUG-14 06:37:00 (MST-7)
Location: HINSDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Beaver Creek near Hinsdale (BCHM8) rose above its flood stage of 14 feet at 3:01 PM MST on August 24th, crested in major flooding at 19.52 feet at 12:30 AM MST on August 26th, then fell back down below flood stage at 6:37 AM MST on August 29th.  The crest of 19.52 feet became the new record historical crest for that gauge.

Flood in GARFIELD, MONTANA
From 24-AUG-14 19:00:00 to 27-AUG-14 04:00:00 (MST-7)
Location: RICHLAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Musselshell River at Mosby (MSBM8) rose above its flood stage of 10 feet at 7:00 PM MST on August 24th, crested in major flooding at 14.36 feet at 5:00 PM MST on August 25th, then fell back down below flood stage at 4:00 AM MST on August 27th.

Flood in VALLEY, MONTANA
From 24-AUG-14 21:50:00 to 31-AUG-14 23:59:00 (MST-7)
Location: GLASGOW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Milk River at Glasgow - Hwy 24 bridge (GLWM8) rose above its flood stage of 25 feet at 9:50 PM MST on August 24th, crested in major flooding at 31.75 feet at 12:26 AM MST on August 26th, and continued flooding into September.

Flood in VALLEY, MONTANA
From 26-AUG-14 06:40:00 to 31-AUG-14 09:50:00 (MST-7)
Location: NASHUA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Milk River at Nashua (NSHM8) rose above its flood stage of 20 feet at 6:40 AM MST on August 26th, crested in minor flooding at 22.97 feet at 1:59 PM MST on August 27th, then fell back down below flood stage at 9:50 AM MST on August 31st.

Flood in VALLEY, MONTANA
From 26-AUG-14 06:16:00 to 31-AUG-14 23:59:00 (MST-7)
Location: TAMPICO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Milk River at Tampico (TMPM8) rose above its flood stage of 23 feet at 6:16 AM MST on August 26th, crested in moderate flooding at 25.12 feet at 8:28 AM MST on August 29th, and continued flooding into September.

Flood in PETROLEUM, MONTANA
From 23-AUG-14 15:00:00 to 27-AUG-14 15:00:00 (MST-7)
Location: WINNETT
Flood cause: Heavy Rain
Property damage: 515.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Over 5 to 10 inches of rainfall fell in a four day period.  This caused massive flooding in area creeks and streams.  The most significant damage was from Flatwillow Creek into the Musselshell River.  Cooperative weather observers noted it was the highest they had ever seen the water on Flatwillow Creek, including the 2011 flood season.  It was high enough that the USGS gage on Flatwillow Creek was washed out and is gone, and the Flatwillow Road bridge was also washed out.  The County DES coordinator reported over 30 locations with damages to culverts, roads and bridges with damages of at least $515,000.

Flood in VALLEY, MONTANA
From 24-AUG-14 05:00:00 to 27-AUG-14 05:00:00 (MST-7)
Location: GLASGOW
Flood cause: Heavy Rain
Property damage: 1.12M
Crop damage: 0.00K
Reported by: NWS Storm Survey

Heavy rainfall in the basin with amounts ranging from 4 to 10 inches over a four day period caused significant flooding in all the streams in the basin, and eventually the rivers.  Willow Creek, Antelope Creek, Cherry Creek, Larb Creek, Brazil Creek all flooded during this time frame, blocking off many gravel roads around the county.  Valley County had at least 36 locations with damages and DES reported to FEMA the totals were $1.2 million.  Willow Creek Road from Fort Peck to the Pines had a very large area completely wiped out with a large culvert gone.