1 of 2 things or both, alignment or balance.
Your front brake rotors need to be machined or replaced.
You need an alignment.
it shakes to the right or left
Your front tires are defective. Its time to replaced them.
usually steering shakes over 60 mph is due to front tires needing to be balanced unless you have something more serious going on.
Steering wheel shakes
Your automobile may have a tire out of balance or a worn part in the front end causing this "shimmy" effect .
YOUR FRONT ROTORS ARE WARPED. YOU NEED A BRAKE JOB.
depends on when it shakes if it shakes when you put on the brakes-warped rotors otherwise it could be ball joints, steering joints, wheel bearings or even out of balance tires
Check the front tires/rims for snow packed in them. That can cause it to be out of balance.
on the steering wheel inside lower right front fender, in front of the right front wheel; access from underneath