IDAHO FALLS — Flooding is imminent along the Portneuf River in Pocatello for Saturday, March 18.
As of noon Friday, the river had risen to 8.4 feet. Flooding will begin when the river crests 8.5 feet. Minor flooding is forecast through the weekend. The National Weather Service predicts the river will rise to 10 feet by Sunday morning.
At 10 feet significant flooding of agricultural land will occur in the Inkom and Blackrock area. Lowland flooding will occur along sections of the river in Pocatello from Portnuef Gap to the Cheyenne Avenue Bridge and downstream of the concrete channel beginning at Sacajawea Park.
Flood advisories remain in effect for the following counties: Oneida, Blaine, Bingham, Bear Lake, Caribou and Minidoka.
NWS reports snow melt is causing flooding on U.S. Route 191 north of Malad between Devils Creek Reservoir and Power House Road.
Water has also been reported on State Highway 36 between Interstate 15 and Deep Creek Reservoir.
There is minor flooding of roads and basements in the following communities: Montpelier, Saint Charles, Dingle, Paris, Bloomington, Bern, Ovid, Border Summit, Pegram, Carey, Picabo, Gannett, Fish Haven, Aberdeen, Springfield, Moreland, Pingree, Taber and Sterling.
Flooded fields are being reported in the following counties: Caribou, Bear Lake, Bingham and Oneida.
The following cities also remain under a flood watch until Monday: Burley, Rupert, Heyburn, St. Anthony, Ashton, Island Park, Driggs, Victor, Pocatello, Malad City, Oakley, Rockland, Henry, Soda Springs, Downey, Lava Hot Springs, Preston, Montpelier, Hailey, Ketchum, and Bellevue.
No major road closures are being reported as of 8 a.m. Saturday.
The Upper Snake River Plain will be mostly sunny with highs of 55 to 65 degrees. Northeast winds of 10 mph will increase slightly at night. Clouds will roll in during the evening bringing a 50 percent chance for rain and thunderstorms. Lows of 36 to 45 are expected.
Pocatello, Blackfoot, Shelley and Firth will be mostly sunny today with highs of 60 to 70 degrees. East winds of 10 mph are expected in the morning, increasing to 10 to 20 mph in the afternoon. It’ll be cloudy at night with a 50 percent chance of rain and thunderstorms in the evening. Lows of 37 to 46 degrees are expected with southwest winds of 10 to 15 mph at night.
The Upper Valley and Teton Valley will be mostly sunny Saturday with a slight chance of showers and thunderstorms in the afternoon. Highs of 52 to 60 degrees are expected. At night there is a continued chance of rain and thunderstorms with lows of 37 to 44 degrees.
It’ll be partly sunny with a slight chance of rain showers in the morning and thunderstorms in the afternoon. Temperatures will rise to between 49 and 59 degrees. A chance of snow and rain showers and thunderstorms is possible in the evening with lows of 33 to 40 degrees.
It’ll be mostly sunny and breezy Saturday with highs of 56 to 66 degrees. At night there is a chance of rain and thunderstorms with lows of 36 to 44 degrees.
Stephan Rockefeller, EastIdahoNews.com
Nate Eaton, EastIdahoNews.com