May 7th, 2015 Heavy rain and flooding

Watershed Overview

Note the orientation of where the heavy rain fell in this event.  The storms moved in a similar orientation to Salt Creek (southwest to northeast), likely contributing the historic river levels observed after the rain ended.

Click the image above for an overview map of Salt Creek

Big Blue River:

Moderate flooding occurred along the Big Blue River through northern and central Gage County. The flooding was extensive over the western and southern side of the city of Beatrice leading to many local streets to be closed, in addition to U.S. Highway 77 and U.S. 136. The Big Blue River created near Crete at 24.18 feet, or 3.18 feet above flood stage during the afternoon of the 7th. The Big Blue River at Beatrice crested at 30.26 feet, or 12.26 feet above flood stage late in the evening on the 7th. The Big Blue River near Barneston crested at 27.78 feet or 7.78 feet above flood stage during the morning on the 8th.

near Crete, Nebraska	at Beatrice, Nebraska	near Barneston, Nebraska

Turkey Creek

Extremely heavy rainfall of 5 to 10 inches fell along the Turkey Creek basin. This allowed for the creek to swell into moderate flood levels. Flooding along the Creek resulted in numerous rural road closures and significant low-land flooding. The combination of the Turkey Creek and Big Blue river led to nearly the entire town of De Witt to be flooded on the 7th of May resulting in a voluntary evacuation of the city. The creek at Wilber crested at 17.89 feet, or 5.39 feet above flood stage.

near Wilber, Nebraska	near DeWitt, Nebraska

Little Blue River

Extremely heavy rainfall of 6 to 10 inches fell across the northern basin of the Little Blue River. This cause the river to swell to record levels around the Fairbury area. The flooding resulted in the mandatory evacuations of areas of the western and southern parts of town, to the west of the Union Pacific Railroad tracks. The flooding of some residents along the river did result in one fatality of an elderly residence in her basement. The river crested at 25.48 feet or 6.98 feet above flood stage.

near Fairbury, Nebraska

Wahoo Creek

Heavy rainfall of 2 to 5 inches fell across the Wahoo Creek basin from the evening of the 6th into the morning of the 7th. This resulted in widespread low-land flooding along the creek from near Ithaca to Ashland . 

at Ithaca, Nebraska	at Ashland, Nebraska

Salt Creek

Record rainfall of 5 to 10 inches fell across Lancaster County, and the Salt Creek basin on the evening of the 6th into the early morning of the 7th. This led to significant flooding along the creek, from near Roca north through the Lincoln metro area. The flooding resulted in numerous road closures, water rescues and some mandatory evacuations. The flooding was largely contained within the levee system within the city of Lincoln, but many parks and low-lined areas were flooded.

near Roca, Nebraska	at Pioneers Blvd in Lincoln	Haines Branch at SW 58th Street
Middle Creek at W 63rd Street	at North 27th Street	at 70th Street
Stevens Creek - northeast of Lincoln	at Greenwood, Nebraska	at Ashland, Nebraska

Rainfall Summary

Rainfall reports across the area were substantial to say the least. While the highest official report was 10.91 inches, higher unofficial reports were received by the National Weather Service.  Some of this rainfall amounts exceed 12 inches. The figures below show both the magnitude and areal coverage of the storms. Figure 3 is an attempt to show how rare the rainfall was.  Note in this image that some of the rain falls into the 100-200 year category. This doesn't mean that rains this heavy only happen once every 100 to 200 years, rather they have a 1% or less of occurring any year!

Figure 1: NWS Quality-Controlled Rainfall Estimates Source: AHPS	Figure 2: Select Rainfall Totals	Figure 3: Rainfall Return Period Source: FLASH

Photos

Fredrick Avenue in Fairbury (source: Jefferson Co. EM)	Steele City (source: Jefferson Co. EM)	Railroad cut near Fairbury (source: Jefferson Co. EM)
Southwest 56th Street (source: USGS)	Southwest 56th Street (source: USGS)	Homestead Trailhead (source: USGS)
Pioneers Blvd (source: USGS)	Roca bridge (source: USGS)	Roca Road (source: USGS)
Flooding at Warlick Blvd (source: USGS)	Flooding at Silver Street in Ashland (source: JEO)	Saltillo Road (source: USGS)
USGS Crews at work during the flood