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<br />(IA'~ r.o <br />' (.., .... \,... <br /> <br />ACCESS SHAFT TO ROBER TS TUNNEL (Altitude ground surface 9,696 ft.) <br /> <br />Location: - Eight and one-half miles east of the. West Portal; near Montezwna, Colo. <br /> <br />Built: ~ Under construction by Blue River Constructors with estimated date of <br /> <br />completion in October, 1957. <br /> <br />Function: - To permit opening up two additional headings for tunnel excavation. Also <br /> <br />will be us ed for spoil removal and material handling. Needed to accelerate <br /> <br />work to permit completion of twmel by January of 1962. <br /> <br />Design: ~ <br /> <br />16 foot circular, concrete lined shaft 916 feet deep. <br />.o,,/,/-s 0/ 5h.4// ...4ne /, /957 450 h../. <br />