In my experience, any noise coming from the wheel bearings is an indicator of wear - and ultimately a repair job in my future.
See "Related Questions" below for questions/procedures on Windstar front wheel bearing replacement.
Power steering or wheel bearing?
Tires can make road noise Pinion bearing? Wheel bearing?
A grinding noise form a wheel is usually caused by a bad wheel bearing.
wheel bearing
worn or bad wheel bearings will make noise (grinding, humming, etc)
A grinding noise in the wheel will either be caused by worn brake pads, or a defective wheel bearing. Remove the left front wheel and inspect brake pads. If the brake pads are OK, you will need to remove the caliber and inspect the wheel bearing.
Strut, ball joints, roll-bar coupling, wheel bearing
Sounds like a wheel bearing to me.
It will rumble and increase with speed.
Could be, in need of brakes or wheel bearing failure,
The wheel bearing?
The wheel bearing