>> Nebraska Gov. Pete Ricketts makes an emergency declaration.
>> That night and into Wednesday, more than 2 inches of rain falls in the Loup, Elkhorn, and Lower Platte River basins.
>> Blizzard warnings go into effect for the Nebraska Panhandle, and all state roads and highways in the Panhandle are closed. Flood warnings are issued for eastern Nebraska. The Nebraska State Emergency Operations Center activates, and the Nebraska State Patrol puts Light Armored Vehicles in Norfolk for potential evacuations.
>> From March 13 to 23, the Army Corps of Engineers reduces to zero its releases from Fort Randall Dam, which eliminates flows from controlled releases on the Missouri River.
>> Officials fly over the Platte River, considering whether to blow up an ice jam there. By afternoon, a 2-mile-long ice jam forms where the Platte and Elkhorn Rivers meet.
>> Meanwhile, water overtops the western Sarpy County levee. Water is rising in the Papillion Creek, nearly reaching the banks in some spots.
>> Just a little to the southwest, the Nebraska National Guard’s training site, Camp Ashland, begins flooding on the south side of camp as the Salt Creek overflows its banks. Slightly farther to the west is the Platte River. About 225 soldiers from Nebraska and other states taking classes at the camp are evacuated.
>> In northeastern Nebraska, flooding on the Ponca Creek forces Niobrara Valley Hospital in Lynch to evacuate two patients.
>> The Veridgre Creek at Veridgre hits a record crest of 12.69 feet, almost five feet higher than the previous record from 2007. Three other creeks and rivers set records.
>> At 1:58 a.m., a 911 caller alerts the Nance County Sheriff’s Office that a bridge on Nebraska Highway 39 over the Loup River in Genoa is out. The deck of the 120-foot-long bridge collapsed at both ends.
>> In northeast Nebraska, huge ice blocks and gushing water from the Niobrara River lead to the collapse of the Spencer Dam in the early morning. Kenny Angel, who was living near the dam, goes missing. His body has not been found.
>> In the aftermath of the dam failure, the Mormon Canal bridge over the Niobrara River on Nebraska Highway 12 at Niobrara is washed away and the approach to a bridge on U.S. Highway 281 in Spencer is washed out. The waterline for much of Boyd County is damaged, leaving residents without running water.
>> In Norfolk, Scott Goodman, 30, is last seen stranded on top of his car amid flooding. His body has not been found. Fifty-year-old Columbus farmer James Wilke, on a tractor, dies trying to rescue a motorist. He falls into the flooded Shell Creek.
>> Norfolk begins evacuating one-third of the city that morning.
>> The ice jam on the Platte River clears, so explosives aren’t needed. The ice keeps moving downstream to the Missouri River.
>> It becomes clear that multiple levees are in trouble: The western Sarpy County levee continues to overtop. Papio-Missouri River Natural Resources District officials meet with Omaha officials at the Papillion Creek Wastewater Treatment Plant to monitor the R613 levee. Workers sandbag near that levee overnight.
>> From the night of March 14 to March 16, the Corps of Engineers fields calls about levees breaching and overtopping. At 11:30 p.m., Papio NRD officials see the Platte River overtopping the Union Dike near Fremont.
>> The State Patrol calls Pierce County at 8:20 p.m. to say the Nebraska Highway 13 bridge over the Elkhorn River near Hadar had collapsed. A total of 13 state bridges collapse or are damaged enough to require major repairs.
>> In Iowa, I-29 and I-680 north of Council Bluffs close.
>> The Loup River at Genoa hits a record crest of 16.10 feet, topping the previous high mark of 13.9 feet from 1966. At least nine other waterways hit record levels, including Turkey Creek at Dannebrog, the Wood River at Gibbon and the North Loup River at St. Paul.
>> Sixteen temporary shelters open in Nebraska to take in evacuees.
>> The State Patrol, the Nebraska National Guard and Urban Search and Rescue Nebraska Task Force 1 conduct water rescues through the night and day. More rescues are conducted on the local level, too.
>> Cooper Nuclear Station near Brownville in southeast Nebraska declares a Notification of Unusual Event at 5:46 a.m. as the Missouri River continues to rise.
>> The Union Dike protecting the Valley area fails. A 300-foot-wide breach occurs in the early morning just north of the Dodge/Douglas County line on Western Sand and Gravel property. Floodwaters head downstream along the Union Pacific Railroad toward Valley, and the city becomes inaccessible. The National Weather Service office there evacuates.
>> Down in Sarpy County, portions of the R613 levee north and south of the Papillion Creek are overtopped by floodwaters from the Platte and Missouri Rivers. The wastewater treatment plant is shut down. High water flows toward Offutt Air Force Base and Bellevue.
>> Voluntary and mandatory evacuations occur in Valley, Waterloo, and parts of Bellevue and Fremont.
>> The well field on the Platte River that supplies water to Lincoln begins to lose power.
>> Roads to Fremont are cut off — the city becomes an island.
>> Norfolk resident Aleido Rojas Galan, 55, dies in Fremont County, Iowa, after his car drives by a barrier into floodwaters.
>> A large stretch of Interstate 29 south of Council Bluffs closes.
>> Mills County, Iowa, starts ordering evacuations.
>> Gavins Point on the Missouri River near Yankton, South Dakota, reaches a new record crest of 1,212.02 feet, breaking the previous record of 1,210.60 feet from 1960. Four other records are set.
>> The National Guard conducts a sandbagging operation at the Lincoln well field.
>> Offutt begins to flood, with a portion of the runway underwater. The damage is staggering: 137 base structures are affected, and water reaches 9 feet high in some buildings.
>> Camp Ashland takes on more water from the Platte as a levee near the north end of the property fails. Fifty-one of 62 buildings on the site sustain water damage.
>> A dive team retrieves the body of 80-year-old Betty Hamernik, who was trapped by Loup River floodwaters Thursday.
>> The Peru water treatment plant in southeast Nebraska is shut down after a nearby levee breaches in two spots.
>> As of 3 p.m., emergency management officials say 25 Nebraska towns and cities have had full or partial evacuations.
>> The State Patrol advises Douglas County at 10:08 p.m. that the West Center Road bridge has collapsed. Other roads in western Douglas County near the Elkhorn River are battered by floodwaters and close, including West Dodge Road at 228th Street, West Q Road and West Maple Road.
>> Multiple records are broken on the Elkhorn, Platte, Big Blue and Missouri Rivers at Ashland, Louisville, Crete, Plattsmouth, Waterloo, Nebraska City and Brownville. A small breach (100 feet) occurs at the R613 levee near LaPlatte Road.
>> A small breach (100 feet) occurs at R613 Levee System near LaPlatte Road overcrossing.
>> With its well field compromised, Lincoln imposes mandatory water restrictions.
>> Mills County, Iowa, issues a mandatory evacuation for all of Pacific Junction, Iowa. Evacuations of Hamburg, Iowa, also begin.
>> Clear Creek levee along the Platte River breaches in two places: at the National Guard training camp in Ashland and at the Big Sandy area upstream of County Road F. Two large breaches occur on the L611 levee in Iowa along the Missouri River.
>> The Glenwood Municipal Water Treatment Facility in Iowa is shut down.
>> The National Guard conducts sandbagging operations at the Cooper Nuclear Station.
>> Within two days, the Missouri River at Rulo hits 28.14 feet, breaking the previous record of 27.26 feet set in June 2011.
Sources: Nebraska Emergency Management Agency, U.S. Army Corps of Engineers, National Weather Service, Nebraska Department of Transportation, Iowa Department of Transportation, Nebraska Public Power District, Papio-Missouri River Natural Resources District, interviews with residents, emergency managers and local officials