Removal of Cornice at Twin Lakes

File — Box: 1, Folder: 2

Staff Only

Scope and Contents

Photograph number 1: "Removal of massive cornice at Twin Lakes Pass with dynamite. Charges consisted of ten shots holes, each loaded with two sticks of 40% gelatin. Piece of cornice removed was about 75 ft. long."
Photograph number 2: Same as 1.2.1 with cornice removed. "Arrows point to location of shot holes. Note the hard, smooth surface of an older cornice underneath the one removed."
Photograph number 3: "Cornice blast with 15 lb. shaped charge. No evidence of cutting action was observed. Note the break in the cornice did not even extend in to the blast crater."
Photograph number 4: Arrow points to the 1.2.3 crater. "Here a larger piece of cornice was removed, but still no evidence of cutting action was observed. Dotted line shows edge of cornice before removal."
Photograph number 5: "Cornice removed with 15 lb shaped charge buried 3 ft deep and stemmed. Dotted line shows original edge of cornice, arrow points to blast crater. About 50 ft. of cornice was removed."
Photograph number 6: "Cornice blast with 15 lbs of tetrytol, buried 3 feet deep and stemmed. A large amount of the explosive energy is wasted in the spectacular burst of snow. Contrast this with figure [1.2.1]. About 60 ft of cornice was removed."

Dates

1950s-early 1970s

Language of Materials

From the Collection: Collection materials are in English.

Conditions Governing Access

Twenty-four hour advanced notice encouraged. Materials must be used on-site. Access to parts of this collection may be restricted under provisions of state or federal law.