Here is a site for Barn Owl Boxes.
<http://www.state.mo.us/conservation/nathis/birds/barnowl.html>

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Jerry Converse Owls of the night, silent on flight,
Grand Coulee, WA detect their prey, without light of day.
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Christopher Hill wrote:
<snip>
> I'm not sure where to find the appropriate dimensions - as I remember >the
> hole was about 4"x8" and the box itself was maybe 2'h x 2'd x 3'l. Maybe
> someone knows where you can find plans on the web.
>
> One of my infinite never-carried-through ideas was to put one in the barn
> on Spencer Island. Seems like as close to a sure-fire spot as there is.
>
> Chris Hill
>
> "Sentiment without action is the ruination of the soul" - Edward Abbey
>
> On Wed, 4 Feb 1998 Bbsenturia at aol.com wrote:
>
> > Tweeters - I was recently asked the following question by Janna Triesman,
> > Steward of Seattle Audubon's Nature Reserve at Carnation Marsh..
> > There has been a Barn Owl resident in one of the old barns on a property
> > adjacent to the Marsh. In a recent windstorm this barn was blown down. She
> > asked if putting a structure/box in another nearby barn might keep the Barn
> > Owl in the neighborhood - or if there was anything else she might do to
> > 'mitigate' the situation. I didn't know of any measures which might keep the
> > owl around, but thought I should put the question to many of you who know much
> > more about owls than I do.
> > Thanks in advance.
> > Brenda Senturia
> > Bbsenturia at aol.com
> >