OK, so being an architect I have a table of weights of wood both green and dried. Hardwoods like ash are 45-50 lb/ft3 while dry they are closer to 35lb/ft3. Softwoods like fir and cedar are in the 30's. Looking at the Craigs list photo I'd say it's about 4ft long and the ad says it is about 13" diameter. I calculated its volume as just over 4 ft3, so I'd put money on it being between 150 and 200lb.