Rainfall of 4 to 8 inches fell over much of eastern Nebraska and southwest Iowa over the weekend of May 4th, 5th and 6th, 2007.  Besides causing localized flash flooding, the heavy rain also produced areas of prolonged river and creek flooding over the region.
Heavier 96 hour rain amounts ending Monday morning included...
Across eastern Nebraska...
7.46 inches at Omaha Eppley, 7.15 in Falls City, 6.91 at Bellevue, 5.03 in Syracuse, 4.94 at Auburn, 4.90 in Lincoln, 4.88 at Plattsmouth, 4.55 at Fairbury and 4.39 at the NWS in Valley.
Over western Iowa...
7.98 inches at Logan, 7.87 in Randolph, 7.52 in Shenandoah, 6.96 at Red Oak, 6.36 at Sidney, 6.32 in Onawa, 6.11 at Clarinda, 6.10 at Harlan and 6.04 at Oakland.

Flood in FREMONT, IOWA
From 06-MAY-07 03:30:00 to 08-MAY-07 20:30:00 (CST-6)
Location: RANDOLPH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rainfall over the weekend of May 4th through the 6th, caused the West Nishnabotna River to flood across Fremont county. The West Nishnabotna River at Randolph crested a little over 24 feet for around 10 hours from a little after midnight until late morning on the 7th.  Flood stage is 19 feet.  The river at Randolph first crossed flood stage around 330 am cdt on the 6th and didn't drop below flood stage until the evening on the 8th.
The flooding affected farmland and many county roads in the area.

Flood in HARRISON, IOWA
From 06-MAY-07 09:00:00 to 06-MAY-07 17:00:00 (CST-6)
Location: DUNLAP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Rainfall of 5 to 8 inches fell over much of Harrison county over the weekend of May 4th through the 6th.  Logan reported nearly 8 inches from this event.  The heavy rain caused the Boyer River to flood on May 6th. The Boyer River at Logan reached a crest just above 21 feet around 115 pm cdt May 6th, flood stage is 19 feet.  The river at Logan was above flood stage from 1000 am until around 6 pm on May 6th.

Flood in PAGE, IOWA
From 06-MAY-07 05:00:00 to 08-MAY-07 08:00:00 (CST-6)
Location: SHENANDOAH
Flood cause: Heavy Rain
Property damage: 932.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rainfall over the weekend of May 4th through the 6th, caused the the East Nishnabotna River to flood around the Shenandoah area.  Flood waters inundated 45 trailers and some vehicles near town and caused the closure of Highways 59, 48 and old Highway 2.  Most if not all main east to west county roads across the county were closed due to flood waters.  See Montgomery county for river levels of the East Nishnabotna River at Red Oak.
Flooding along the East Nishnabotna River, the Nodaway River and other smaller streams caused almost 1 million dollars worth of damage to county roads and bridges.

Flood in PAGE, IOWA
From 06-MAY-07 14:00:00 to 06-MAY-07 15:30:00 (CST-6)
Location: CLARINDA
Flood cause: Heavy Rain
Property damage: 932.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rainfall over the weekend of May 4th through the 6th, caused the Nodaway River to briefly surpass it's 19 foot flood stage near Clarinda during the mid afternoon hours on May 6th.  The river crested around 19.2 feet at 345 pm on the 6th.  After falling a little below flood stage an hour later, the Nodaway River remained high for an additional 24 to 36 hours.  Flood damage from the Nodaway River, the East Nishnabotna River and other small tributaries amounted to almost 1 million dollars.

Flood in MONTGOMERY, IOWA
From 06-MAY-07 04:45:00 to 08-MAY-07 09:30:00 (CST-6)
Location: ELLIOTT
Flood cause: Heavy Rain
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rainfall over the weekend of May 4th through the 6th, caused the East Nishnabotna River to flood across Montgomery county.  The flooding closed Highway 34 near Red Oak for a while on Monday May 7th.  The East Nishnabotna River at Red Oak crested around 26.4 feet about 9 am cdt on May 7th.  Flood stage is 18 feet.  The river at Red Oak first crossed flood stage around 6 am cdt May 6th and didn't drop below flood stage until late morning on the 8th.
Besides the flood waters closing Highway 34 near Red Oak, Highway 48 around Elliott was also closed due to flooding.  In addition, farmland and many county roads in the area were flooded from around Elliott through Red Oak and toward Coburg.  It was estimated that damage to county roads alone amounted to $150,000.

Flood in POTTAWATTAMIE, IOWA
From 06-MAY-07 05:00:00 to 07-MAY-07 12:00:00 (CST-6)
Location: AVOCA
Flood cause: Heavy Rain
Property damage: 1.56M
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rainfall over the weekend of May 4th through the 6th, caused the West Nishnabotna River to flood across Pottawattamie county. The West Nishnabotna River at Hancock crested around 20.5 feet between 1130 pm and midnight May 6th. Flood stage is 14 feet. The river at Hancock first crossed flood stage around 6 am cdt May 6th and didn't drop below flood stage until around 1 pm cdt on the 7th.  The flooding affected farmland and many county roads in the area from around Avoca through Hancock.  Some homes were also damaged.

Flood in FREMONT, IOWA
From 06-MAY-07 04:15:00 to 15-MAY-07 06:15:00 (CST-6)
Location: RIVERTON
Flood cause: Heavy Rain
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rainfall over the weekend of May 4th through the 6th, caused the Nishnabotna River to flood across Fremont county. The Nishnabotna River at Hamburg reached a prolonged crest of around 32.4 feet between 715 pm and 1145 pm on May 8th.  Flood stage is 23 feet.  The river at Hamburg first crossed flood stage around 6 am CDT on May 6th and didn't drop below flood stage until around 7 am on May 15th.
The flooding closed Interstate 29 for a while and an agricultural levee broke south of town sending significant amounts of water across agricultural bottom lands and county roads in the region early May 7th.
Flooding was also observed along the East Nishnabotna River northeast of Riverton to it's merger with the West Nishnabotna near Riverton where it forms the Nishnabotna that passes near Hamburg.  Some home damage and county roads closures were reported in the area due to flood waters.

Flood in HARRISON, IOWA
From 06-MAY-07 04:30:00 to 15-MAY-07 17:00:00 (CST-6)
Location: MISSOURI VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

A combination of water from Willow Creek due to a failed levee and high water from the Boyer River caused a prolonged period of extensive flooding in the southwest sections of the Missouri Valley area.  The flooding was due to rainfall of 5 to nearly 8 inches that fell over the weekend of May 4th through the 6th. Logan reported nearly 8 inches from this event.
The area most affected was the southwest part of town, which sat below the bluffs where most of the town is located.  At least 77 homes and 6 businesses were flooded and declared an almost complete loss.  Many vehicles were also flooded or severely damaged. Interstate 29 was closed for a while near town, along with Highway 30 and other local roads. The high water continued in the area for over one week.  It was estimated that road repair alone would cost several million dollars.  Although homes in the higher sections of town escaped flood waters from the levee break, many sustained damage due to flooded basements, mudslides or basement walls caving in.  The flooding prompted schools to be closed on Monday May 7th.

Flash Flood in MONTGOMERY, IOWA
From 07-MAY-07 00:00:00 to 07-MAY-07 04:00:00 (CST-6)
Location: RED OAK
Flood cause: Heavy Rain
Property damage: 1.13M
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain for the second consecutive night caused flash flooding along Red Oak Creek in Red Oak as the creek backed up because of high flows on the East Nishnabotna River.  Authorities attempted to evacuate nearly 1,600 people, beginning around 300 am local time, although not every attempt was successful.  The water caused extensive damage to many basements in town, but no serious injuries were reported.  In total an estimated 50 homes were damaged by flooding.

Flood in MONONA, IOWA
From 06-MAY-07 18:45:00 to 08-MAY-07 20:00:00 (CST-6)
Location: TURIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rainfall of 5 to 7 inches over the weekend of May 4th through the 6th, Onawa reported 6.32 inches from this event, caused the Little Sioux River to flood from May 6th through the 8th.  The Little Sioux River near Turin reached a crest of just under 23 feet around 1115 am cdt on May 7th, flood stage is 20 feet.  The river near Turin was above flood stage from 745 pm on the 6th until 9 pm on the 8th.

Flood in MILLS, IOWA
From 06-MAY-07 05:00:00 to 07-MAY-07 12:00:00 (CST-6)
Location: HENDERSON
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rainfall over the weekend of May 4th through the 6th, caused the West Nishnabotna River and its tributaries to flood several county roads in Mills county prompting their closure.  See Pottawattamie county for specifics of the West Nishnabotna River at Hancock.