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Historic site · Delaware

Mason-Dixon Post Mark'd West

Mason-Dixon Post Mark'd West from directly overhead

Mason-Dixon Post Mark'd West is a historic site in Delaware, at a modelled elevation of 67 m. Gap Hill stands 252 m to the northwest, 23 miles off. The nearest named place is Middle Run Natural Area, a nature reserve 0.7 miles away. Mason and Dixon Byway passes 3.5 miles off. 25 named summits stand within 25 miles.

Mason & Dixon traveled west then south from Philadelphia to establish the base point from which their survey began for the latitude for the PA-MD boundary. Mason referred to this marker in his journal as "the post mark'd west".

The record

What the record says

Inscription
THIS POINT USED AS BASE POINT IN THE SURVEY OF MASON DIXON LINE 1763-1767
Visiting

What to expect

Access
Yes
Getting there

How to reach it

Driving directionsPlan a drive around it
Coordinates39.72243, -75.73231

Overlooks nearby

Around it

Named places within 25 miles

Parks
  • Paper Mill Park: 1.1 mi
  • Deacons Walk Park: 1.4 mi
  • Ridgewater Park: 1.9 mi
  • Newark Resevoir Park: 2.1 mi
  • Karpinski Park: 2.2 mi
Historic sites
Museums: 51
Nature reserves: 50
Gardens: 49
Attractions: 32
Peaks: 25
Artworks: 23
  • The Student: 2.7 mi
  • Wings of Thought: 3.2 mi
  • Chloe & Lucinda (Nubian Goats): 3.2 mi
  • Admiral Francis Dupont Statue: 8.9 mi
  • William Julius “Judy” Johnson: 8.9 mi
Picnic sites: 9
  • Picnic Area: 10.4 mi
  • Ridley Creek State Park - Area 15 Picnic Site: 21.2 mi
  • Ridley Creek State Park - Area 12 Picnic Site: 21.2 mi
  • Ridley Creek State Park - Area 14 Picnic Site: 21.3 mi
  • Ridley Creek State Park - Area 13 Picnic Site: 21.3 mi
Ghost towns: 5
Beaches: 5
Cliffs: 2
Springs: 2
  • Black Rock Spring: 22.4 mi
  • Black Barren Spring: 24.3 mi
Rest areas: 1
Lighthouses: 1
  • Bethel Bridge Lighthouse (replica): 14.1 mi
On the horizon

Summits around it

The highest named summits within 25 miles of Mason-Dixon Post Mark'd West. Elevation from each summit’s own record; bearing measured between the two coordinates.

SummitBearingElevationDistance
Gap HillNW 322°252 m23.1 mi
Harmony HillN 9°146 m18.2 mi
Mount FelixWSW 244°142 m23.6 mi
Ebright AzimuthNE 55°137 m13.8 mi
Goat HillW 270°135 m18.9 mi
Mount AraratWSW 245°134 m20.7 mi
Egg HillWSW 244°125 m9.9 mi
Hunting HillNE 42°125 m22.2 mi
Conditions

When to go

Light through the year

DateSunriseGolden hourSunset
March equinox07:0718:4019:15
June solstice05:3619:5420:35
September equinox06:5118:2619:02
December solstice07:2116:0016:42

Local time (America/New_York).

Climate normals

Months averaging 50–80 °F: Apr–Oct.

JanFebMarAprMayJunJulAugSepOctNovDec
Avg °F343644556473787669584638
Precip in3.42.94.33.73.63.94.83.94.94.03.44.0

1991–2020 U.S. Climate Normals, NOAA NCEI — Newark AG Farm, 4 mi away.

Sources

Where this comes from

Location and category confirmed against OpenStreetMap.

OpenStreetMap

OpenStreetMap element node/9945684448

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