Ice built up on area rivers following very cold temperatures through February and early March. The last cold snap in early March was followed by a round of unseasonably warm temperatures that caused the ice to began melting and to break-up on the Big Horn and Nowood rivers in Big Horn and Washakie counties. The result was ice jam flooding that impacted areas from Worland to north of Greybull on the Big Horn River, and from near Ten Sleep to Manderson on the Nowood River.
The flooding began on Friday morning, March 7, in Worland near the Highway 789 bridge on the west side of town.  Several homes received at least minor flooding, the local radio station had to be sandbagged to protect it, and at least 80 people were evacuated. A gas pipeline also broke in Riverside Park under the weight of the massive chunks of ice that were as big as trucks. The ice jams affecting Worland gradually gave way and moved downstream on March 8, but downstream areas north to the Big Horn County line still experienced flooding for the next few days. Flooding on the Nowood River in Washakie County inundated ranch lands, corrals, and a barn, and caused at least one resident to evacuate their home.
Additional flooding occurred downstream along both rivers in Big Horn County. One ranch along the Nowood River was significantly impacted by the rising water created by the ice jams. The town of Manderson, near the confluence of the Big Horn and Nowood, was threatened for a couple of days as the ice jams moved down both rivers.  One business was flooded and water surrounded more than a few homes on March 9 and 10. At one time, water was flowing down the main street of town. Aggressive sandbagging efforts diverted water around Manderson school and the water treatment plant. Farther downstream on the Big Horn River, flooding threatened the town of Greybull. A levee system served well to protect the community and only three homes outside the levee received minor flooding. The Spence Oil Field north of Greybull and other low-lying areas north of town were flooded during the ice jam episode.

Flood in WASHAKIE, WYOMING
From 07-MAR-14 06:45:00 to 09-MAR-14 17:00:00 (MST-7)
Location: (WRL)WORLAND MUNI AR
Flood cause: Ice Jam
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Ice jam flooding caused damage in Worland. Neighborhoods near the river north and south of the Highway 789 bridge reported flooding of some homes. The water extended 100-200 yards from the river's edge at a depth of 12 to 18 inches.

Flood in BIG HORN, WYOMING
From 07-MAR-14 18:00:00 to 11-MAR-14 09:30:00 (MST-7)
Location: RAIRDEN
Flood cause: Ice Jam
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An ice jam caused flooding around the town of Manderson near the confluence of the Big Horn and Nowood rivers. The National Guard was called in to assist with sandbagging and other protective measures on March 9 and 10.

Flood in BIG HORN, WYOMING
From 07-MAR-14 16:00:00 to 11-MAR-14 09:30:00 (MST-7)
Location: GREYBULL
Flood cause: Ice Jam
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding of the Spence Oil Field and other areas north of Greybull occurred along the Big Horn River. Three homes outside the Greybull levee system had minor flooding.

Flood in WASHAKIE, WYOMING
From 07-MAR-14 11:00:00 to 09-MAR-14 17:00:00 (MST-7)
Location: DURKEE
Flood cause: Ice Jam
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding of two ranches occurred along the Nowood River north of Ten Sleep. The ice jams formed on several bends in the serpentine river flooding ranch lands. At least one resident evacuated their residence as the water level climbed.