According to Spofford Fire Chief Gordon Rudolph, the crash occurred about halfway up Chesterfield Hill, near the intersection of Cady Lane.
The two cars collided head-on, said Rudolph.
"Both came to rest in the westbound lane, facing west," he said. "And both operators were heavily entrapped."
According to a press release from the Chesterfield Police Department, Emily Ranagan, 19, of Spofford, was traveling east at approximately 10:35 a.m. when she crossed into the westbound traffic lane, causing two other vehicles to take evasive action before she collided with a car being driving by Carol Menck, 74, of Brattleboro.
After extrication, which was conducted by the Keene Fire Department, both were transported to Cheshire Medical Center before being transported to Dartmouth Hitchcock Medical Center in Lebanon for treatment of serious injuries.
Route 9 was closed for about two-and-a-half hours and all traffic, except for tractor-trailer trucks, were diverted along Cady Lane to Old Chesterfield Road.
At this time, the Chesterfield Police Department is continuing to investigate this accident. Any persons who witnessed this accident are encouraged to contact Lieutenant Duane Chickering at 603-363-4233, ext. 62.
The Brattleboro Fire Department was called to assist with another extrication device, but was not needed. The Spofford Fire Department and the Chesterfield Police Department were assisted by Diluzio Ambulance, the Chesterfield Fire Department, the Cheshire County Sheriff's Department and the New Hampshire State Police.
Bob Audette can be reached at firstname.lastname@example.org, or at 802-254-2311, ext. 160. Follow Bob on Twitter @audette.reformer.