Sadly, the cart is still there. I think there are several other carts in the vicinity also. There must be a huge magnet in the canal that attracts the carts.

The cart is still there as of June 27, 2013

Unfortunately, the cart is still there as of July 27th, 2013.
I see it there every evening.

Is there a direct telephone number to call to have carts picked up on the canal property / bank?

I give up.