I've been having fun with this today. I added the old mill lot to Riverview - the venue is a free download
here from the Sims 3 Exchange.
I created a 50 x 50 lot next to the dead end road after I evicted old Cottoneye and bulldozed his lot. I expanded the water to the edge of the lot where I added another lot as close as I could between it and the river. Then I build a waterway to the river. I'm quite happy with how it turned out.
I haven't finished all the details on the mill yet but I thought I'd show off the site.
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