The 21-year-old driver, Colten Treu of Chippewa Falls, sped off but later surrendered.
The driver fled the scene after the crash Saturday, and officials issued a call for help in locating the suspect vehicle. The pickup truck left the road and struck the Girl Scout troop in the ditch.
Daniel Sokup of the Lake Hallie Police Department as saying that the driver of the pickup that hit the group fled the scene but later turned himself in.
It was unclear it Treu was distracted in the moments leading up to the crash, Sergeant Sokup told Minnesota's Star Tribune.
"The Lake Hallie Police Department would like to extend our deepest sympathies to the families involved", Sokup said.
Troop 3055's regional council, the Girl Scouts of the Northwestern Great Lakes, expressed its condolences on Facebook and said a vigil will be held on November 4 evening at the girls' school.
"I'm always telling one of my residents that he shouldn't walk this strip at night", Spallees told the newspaper. Sokup said the crash happened before a Treu's pickup went over a hill and, he said, there were no blind spots.
Residents and local business owners near the site of the crash told the Star Tribune that the site is notoriously unsafe. The Girl Scout Troop members - fourth graders at Halmstad Elementary School in Chippewa Falls - were accompanied by several adults and were wearing bright safety vests.
"Truly, as a community, this affects everyone one of us". 29 overpass, chattering and laughing when the Ford F-150 ploughed into them. A third juvenile female was transported to the hospital where she later died.
Woldhuis said the mother and daughter who died attended Chippewa Valley Bible Church, where he presides.
"It could have been us", said Sara Walker, a Girl Scout Troop Leader. "Just your typical little fourth grade girl skipping through life", Pastor Woldhuis said.
And her mother "had faith, she had goal and invested herself in her children", Woldhuis added.
Counselors, faith leaders and trained school staff would be available at least through November 5 at two elementary schools, according to Chippewa Falls School District Superintendent Heidi Eliopoulos.
She said the names of the victims are expected to be released Monday by the Village of Lake Hallie Police Department.