BOISE -- A thin layer of snow on slick roads caused dozens of schools to close Thursday in the the Treasure Valley.
Notably, Kuna schools, Mountain Home schools, Horseshoe Bend Schools, and schools in Blaine County stayed open.
While the bad weather also caused dozens of slide-offs and car accidents, the amount of problems increased as the day progressed.
Just about an inch of heavy, wet snow accumulated in Boise overnight Thursday. Temperatures hovered around 30 to 31 degrees. An additional two inches of snow fell Thursday afternoon.
KTVB meteorologist Larry Gebert says it wasn't the volume of snow that made travel dangerous Thursday morning, it was a layer of freezing rain underneath.
"It was the worst case scenario because it was freezing rain first," Gebert said.
Traffic slowed in many places because of the slippery roads.
However, Interstate 84 and the Treasure Valley's main artery roads were largely cleared of snow throughout Thursday morning.
ITD spokesman Reed Hollingshead said state crews had been working throughout the night to prepare roads with de-icer, salt, and sand.
Ada County Highway Department crews reportedly dropped 36,000 gallons of deicer throughout the night.
Roads in Boise and Meridian were snow packed and slippery during Thursday's commute. Hilly areas near Boise's foothills were reportedly very slick.
Just before 2 p.m., ITD closed I-84 between exit 222 just after Burley to the Utah State Line The road was closed because of drifting snow on the roadway and due to reduced visibility.
Both westbound lanes of I-84 westbound were blocked for two hours near Nampa at 4:25 a.m. after a semitrailer jack-knifed near the Garrity exit.
Two semitrailers also slid-off at milepost 74 near Mountain Home, with one driving through the median and ending up on the opposite shoulder. No one was reportedly injured.
Another semitrailer reportedly slid-off at milepost 86 near Mountain Home.
Meridian police reported a five-car accident on Eagle Road north of Fairview. At least one crash victim had to be cut from a vehicle. Three people were reportedly taken to the hospital.
Several crashes happened on I-84 Thursday afternoon, including a single-vehicle rollover west of the Eagle exit just after 1 p.m.
As of 2 p.m. Canyon County dispatch reported ten accidents, one that included minor injuries.