Thanks greatly for the comments. The bridge does have a graceful sweep to it as 
a result of the arch. 
The preservation feature of covering the bridge is absolutely the reason for 
it. Keeping it clear of snow (in those climes) would, also, be a pretty good 
reason. New Brunswick would be one of those places..right? ;)

Jack


--- On Thu, 10/23/08, frank theriault <[EMAIL PROTECTED]> wrote:

> From: frank theriault <[EMAIL PROTECTED]>
> Subject: Re: PESO: Covered Bridge
> To: "Pentax-Discuss Mail List" <pdml@pdml.net>
> Date: Thursday, October 23, 2008, 11:40 AM
> On Sat, Oct 18, 2008 at 8:55 AM, Jack Davis
> <[EMAIL PROTECTED]> wrote:
> > Last souvenir from yesterdays drive.
> > This was taken at the South Yuba River state park, in
> a settlement named Bridgeport.
> > It's claimed that this bridge, built in 1862, is
> the longest single span covered bridge (251') in the U.
> S..
> > I've shot a number of times over the years. From
> both ends and down along the river, but it has never
> revealed its artistic side to me.
> > While this is 'prox a 40% crop, happily still
> allows a more than decent detailed image.
> > Taken from a convenient bridge crossing the Yuba
> River.
> > I love this camera/lens.
> 
> That's a lovely photo, Jack.  I've never seen a
> covered bridge with an
> arc described across it like that - it's quite striking
> and you caught
> it beautifully!
> 
> As for the questions farther down on the thread, bridges
> were covered
> to protect the road surface from wet weather (snow or
> rain).  Keeping
> the wood roadbed dry (or at least drier) delays rot and
> keeps it from
> becoming too slippery.
> 
> BTW, the longest covered bridge in the world (not a single
> span) is in
> Hartland, New Brunswick Canada.  It's the only reason
> one would want
> to go there, near as I can figure...
> 
> ;-)
> 
> cheers,
> frank
> 
> -- 
> "Sharpness is a bourgeois concept."  -Henri
> Cartier-Bresson
> 
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