Did you mean to ask "Is there a boat ramp at Oxbow?" If so the answer is no. Most of the campsites are primitive with carry-in water access only. However the 2 developed camping areas do have boat ramps (Cash Creek

No boat ramp. This is a primitive site with no amenities except a picnic table. It’s beautiful and secluded, and situated at a bow in the river. When we were there in Feb 2023 we could access the river down a fairly steep bank. So you could possibly lower down a canoe or kayak. But no way to launch anything bigger.