Marys Rock Tunnel

Marys Rock Tunnel (HM8K8)

Location: Luray, VA 22835 Rappahannock County
Country: United States of America

N 38° 39.092', W 78° 18.684'

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Inscription
Drill, blast, and clear. Drill, blast, and clear. For three months workers repeated this process, carving through 600 feet of solid granite (granodiorite) to complete Skyline Drive's greatest construction challenge, Marys Rock Tunnel.

Twice each day workers drilled 40 holes, each 12 feet deep, into the tunnel's rock face. Five hundred pounds of dynamite filled the holes, then detonation. A local newspaper described the process:

"After the blast goes off with a mighty roar it requires two or three hours to clear away the loose boulders and stone and to roll them over the side.... Three 8-hour shifts of about 15 men each are on duty... the machinery never being idle except on Sunday.... Every day 15 or more feet of solid rock are eaten away by the blasts."

In January 1932, they broke through to daylight. Almost immediately venturesome sightseers drove through.

Was Marys Rock Tunnel really needed or was it built just for show? Area historian Darwin Lambert explained, "the tunnel may have been designed into Skyline Drive partly for show, but it seemed justified to eliminate extensive scars and expensive rock retaining walls."
Details
HM NumberHM8K8
Tags
Placed ByShenandoah National Park
Marker ConditionNo reports yet
Date Added Wednesday, October 15th, 2014 at 10:03pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)17S E 733967 N 4281538
Decimal Degrees38.65153333, -78.31140000
Degrees and Decimal MinutesN 38° 39.092', W 78° 18.684'
Degrees, Minutes and Seconds38° 39' 5.52" N, 78° 18' 41.04" W
Driving DirectionsGoogle Maps
Area Code(s)540
Closest Postal AddressAt or near 120-298 Skyline Dr, Luray VA 22835, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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