at least 70 at contact. It destroyed the front corner (point of contact), destroying the entire headlight and surrounding body, and left a dent on the driver-side door where it swung around. Despite some flesh exploding at contact, the deer hobbled off the road into the median.
The cop in Malad helped me fill out the report, advising me to say that the deer ran off (true), and that was the last I saw it. Apparently if I could have confirmed that it was dead, I would have received a ticket. Deer jumps in front of you, and apparently Utah wants to punish you for it. Dumb lawmaking.