Yes that looks right. Even looking at the last 2
contours before the tripoint, the supposed county line
does not even look perpendicular to those contours -
it slants too far east. So the dashed line is neither
the correct county border nor the correct ridge line.
(good job usgs!)

--- "Lowell G. McManus" <mcmanus71496@...> wrote:

> The different colored areas of the PDF map (dark
> purple, green, yellow, blue)
> represent different geologies within the watershed.
> The light purple lines are
> the county and state boundaries. The white area is
> outside the watershed.
>
> The watershed, of course, is bounded by the natural
> ridge line. The map shows
> that the light purple Frederick-Washington county
> boundary deviates eastward
> from the natural watershed boundary as it approaches
> the MDPA state boundary.
> Note that the watershed boundary does indeed
> continue northward into
> Pennsylvania as it should. Yes, there is a slight
> jog at the state boundary,
> but there is also a slight jog in the geologies at
> the state boundary. These
> jogs are probably artifacts of slightly discrepant
> geological data from the two
> states. The deviation of the county boundary from
> the natural ridge line while
> still within Maryland, however, is not a mapping
> accident. It is confirmed by
> the text reference to the "very small portion of
> Washington County" that is
> within the watershed.
>
> The USGS map at http://tinyurl.com/5jme6 shows the
> county boundary, which seems
> to be too far west as judged by Mike Donner's
> on-site observation of a "shiny
> round topped stone post" that he took for the
> tripoint. Note that the USGS does
> show that monument but doesn't think it the
> tripoint. (I'm withholding judgment
> until Mike tells us what it said on that monument,
> if anything.) The USGS map
> does not specifically show the drainage divide, but
> careful inspection of the
> contours will prove that the divide must strike the
> MDPA boundary west of the
> depicted county boundary. The divide runs
> approximately along the north-south
> road through the community of Blue Ridge Summit,
> Pennsylvania. If you will pan
> the map one iteration northward, you will see that
> the divide runs to the small
> hill just southeast of Monterey, then ascends
> Monterey Peak farther north. This
> is not in keeping with the trend of the county
> boundary as it strikes MDPA.
>
> Lowell G. McManus
> Leesville, Louisiana, USA
>
>
> ----- Original Message -----
> From: "Michael Kaufman" <mikekaufman79@...>
> To: <BoundaryPoint@yahoogroups.com>
> Sent: Monday, October 11, 2004 12:06 AM
> Subject: Re: [BoundaryPoint] frederick md
>
>
> >
> > In the map in the pdf - is the left edge of the
> purple
> > area supposed to be the ridge? If it is it goes
> > straight north. But the USGS ridge line and
> supposed
> > county border slants northeast; it most closely
> mimics
> > the purple county boundary in the pdf map. I
> think if
> > the TP marker were on the pdf it would still fall
> east
> > of the purple line.
> >
> > --- "Lowell G. McManus" <mcmanus71496@...>
> wrote:
> >
> > > At http://tinyurl.com/5jpd4 there is an 18-page
> PDF
> > > of a technical study of
> > > water availability in the Monocacy River
> watershed,
> > > which lies east of the Blue
> > > Ridge divide in Maryland and Pennsylvania. The
> > > second and third sentences of
> > > the document state:
> > >
> > > "This drainage area includes significant
> portions of
> > > Frederick County, Maryland;
> > > Carroll County, Maryland; and Adams County,
> > > Pennsylvania. It also includes a
> > > small portion of Montgomery County, Maryland; a
> very
> > > small portion of Washington
> > > County, Maryland; and Franklin County,
> > > Pennsylvania."
> > >
> > > That "very small portion of Washington County"
> > > proves that the
> > > Frederick-Washington boundary must necessarily
> stray
> > > east of the actual drainage
> > > divide. A watershed map on page 3 of the PDF
> shows
> > > such deviation at the
> > > boundary's north end as it reaches its tripoint
> with
> > > Pennsylvania. This
> > > probably somehow accounts for the discrepancy
> that
> > > you noted on the USGS map.
> > >
> > > Washington County was created from Frederick
> County
> > > in 1776, and their common
> > > boundary was surveyed in 1824. Field notes of
> the
> > > survey are listed in the
> > > on-line catalog of the Maryland State Archives.
> > >
> > > Lowell G. McManus
> > > Leesville, Louisiana, USA
> > >
> > >
> > > ----- Original Message -----
> > > From: "aletheiak" <aletheiak@...>
> > > To: <BoundaryPoint@yahoogroups.com>
> > > Sent: Saturday, October 09, 2004 11:04 AM
> > > Subject: [BoundaryPoint] frederick md
> > >
> > >
> > > >
> > > >
> > > > fresh virgin multipoint today class a
> > > >
> > >
> >
>

http://topozone.com/map.asp?lat=39.72417&lon=-77.47167

> > > > where the mason dixon line crosses the blue
> ridge
> > > > tho i only just realized they even do cross
> > > > yikes
> > > > at the interstate tricounty point of franklin
> > > county pennsylvania
> > > > with frederick & washington counties of
> maryland
> > > > aka frfrwa or mdpa3frfrwa or technically
> > > us2mdpa3frfrwa
> > > > marked by a shiny round topped stone post in
> > > someones side yard
> > > >
> > > > & tho i cant tell whether the blue ridge
> itself
> > > may continue in the
> > > > scramble of mountains still farther north from
> > > here
> > > > this point does mark the northern limit of the
> use
> > > of the blue ridge
> > > > as a state &or county boundary
> > > >
> > > > in fact frfrwa is exactly 1 tricounty point &
> 1
> > > state line north from
> > > > mdvawv on the blue ridge
> > > > & all very cleanly so
> > > > seeing as the frwa county line completely
> > > transsects maryland along
> > > > the blue ridge
> > > >
> > > > all of which you can see if you zoom out
> > > >
> > > > but if you zoom in
> > > > you will find this topo is quite odd
> > > > in showing the tripoint & the marker in 2
> > > different locations
> > > >
> > > > on the ground
> > > > there is only an ordinary mdpa marker at the
> > > tripoint position shown
> > > > on the topo
> > > > but the true tripoint marker is the one shown
> > > about 50 yards farther
> > > > east on the opposite side of the road
> > > >
> > > > marker 92 still farther east is a mason dixon
> > > milestone
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
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> >
> >
> >
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> >
>

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