I was thinking along the same lines and went looking for some existing
photos of that stretch of river. Here is a decent starting point:
http://www.americanwhitewater.org/rivers/id/90/
Look especially at the photos listed at the bottom of the page,
including this link, which I believe includes the trifinium:
http://www.americanwhitewater.org/photos/?photoid=1886
I think the large mass near the left center of the photo is the
crescent shaped rock adjacent to the trifinium. This also shows that
low water might make for easy and safe access, possibly even by boat
from the MD side. We should keep an eye on the gage at:
http://waterdata.usgs.gov/nwis/uv?01646500
When the level is below 2.75 feet, it might be worth a try. Pray for
drought.
BJB
--- In BoundaryPoint@yahoogroups.com, "aletheiak" <aletheiak@y...> wrote:
> exactly
> & i also have the same rocks in profile in my river level pix
> with very substantial agreement of many other features too
> so even assuming some slight inaccuracy in the fairfax overlays
> which i do
> having seen the irregularities in some of the other details
> it still wont be hard to find the approximately correct alignment
>
> & of course this is not everything we will need to find
> but it means marker wm1 should be much easier to recover now
>
> & that
> plus mathews & nelson
> plus a place to park the cars
> plus good luck with our new access route
> plus a low enough water level
> plus a security line for leaning out over the river from the bank
> since we dont dare jump in to reach the tripoint
> even if it is just offshore as we expect
> may be all we need to upgrade our laurels to class b
>
> --- In BoundaryPoint@yahoogroups.com, "Lowell G. McManus"
> <mcmanus71496@m...> wrote:
> > I keep looking at the Fairfax County aerial photo and the Urban
> Areas photo on
> > Terraserver. I think that the best way to find the boundary
> below the bluff
> > (where you can't sight from the features above) would be to
> locate it relative
> > to the various rocks in the river as shown on the photos. They
> seem to be
> > scattered in a distinctive manner.
> >
> > Lowell G. McManus
> > Leesville, Louisiana, USA
> >
> >
> > ----- Original Message -----
> > From: "aletheiak" <aletheiak@y...>
> > To: <BoundaryPoint@yahoogroups.com>
> > Sent: Tuesday, August 10, 2004 4:55 PM
> > Subject: [BoundaryPoint] Re: DCMDVAN via Potomac Heritage
> Trail & baarle
> > quadripoint
> >
> >
> > > it looks like i was centering my search maybe 10 or 15 yards
> too
> > > far upstream
> > > due mainly to the unexpected mismatch of the property line &
> > > county line
> > > & i scoured maybe 10 or 15 yards of bank in both directions
> > > so at my lowest reach i probably just missed the true
> alignment
> > >
> > > i will send some pix taken from river level if i ever get the
> scanner
> > > connected again
> > >
> > > --- In BoundaryPoint@yahoogroups.com, "Lowell G.
> McManus"
> > > <mcmanus71496@m...> wrote:
> > > > I'm glad to have been of help. Where were you looking the
> last
> > > time you were
> > > > there?
> > > >
> > > > Lowell G. McManus
> > > > Leesville, Louisiana, USA
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: "aletheiak" <aletheiak@y...>
> > > > To: <BoundaryPoint@yahoogroups.com>
> > > > Sent: Tuesday, August 10, 2004 2:01 PM
> > > > Subject: [BoundaryPoint] Re: DCMDVAN via Potomac
> Heritage
> > > Trail & baarle
> > > > quadripoint
> > > >
> > > >
> > > > > special to lowell & peter from the library
> > > > >
> > > > > > ok it must be my primitive browser who cant again
> > > > > > so i will just run over to the library now to check this as
> well
> > > > > as
> > > > > > peters cadastral map on their hopefully better facility
> > > > > >
> > > > > > & maybe order up brownlie again while i am at it
> > > > > > for mikes nonborder arcs
> > > > > >
> > > > > > so no need for any individual attention yet
> > > > >
> > > > > ok i see it now & it is indeed a substantial improvement
> over
> > > my
> > > > > previous try
> > > > > & it even shows me how i went wrong
> > > > > so thanxx again
> > > > >
> > > > > & combining this with your best aerial zoom gives a
> distinctly
> > > > > different target area
> > > > > in fact near the foot of the transverse ravine coming down
> > > from
> > > > > behind the big lot
> > > > >
> > > > > so no wonder i never found marker wm1
> > > > >
> > > > > i was too far off line to have spotted it
> > > > >
> > > > > so this definitely does advance the try
> > > > >
> > > > >
> > > > > & peter
> > > > > i have finally reached & seen your map too
> > > > >
> > > > > very nice
> > > > >
> > > > > doesnt suggest intervisible markers tho
> > > > >
> > > > > on the contrary
> > > > >
> > > > > so at this point
> > > > > i would spend 10 or 20 bucks for the cadastral data
> > > > > if you think that might be enough to get it
> > > > >
> > > > > but of course i would still need a dutch interlocutor
> > > > >
> > > > > & yikes even then only a professional grade gps receiver
> > > would nail
> > > > > our hard won point for us
> > > > >
> > > > > any thoughts
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Yahoo! Groups Links
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > >
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >