After 7 pm, an emergency call was made for the Macks Creek area, near Arrowrock.
KBOI 2News sent a news crew to the area, where the Boise County Sheriff confirmed a vehicle, for an unknown reason, went off the roadway and into the water.
Dive crews searched the water.
Multiple witnesses reported seeing someone recovered, with the condition unknown.
Boise County and Ada County officials have not released any more information beyond that.