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Tierra Grande Improvement Association Inc. Our Mission It is the Mission of the Tierra Grande Association and its Board of Directors to The Board of Directors constantly strives to build an environment of trust and open communication with the members of Tierra Grande. Our Efforts TGIA Efforts on Landowners Behalf Roads Tierra Grande does NOT own nor maintain any roads in our community. All roads are public roads and were accepted by the Valencia andor Socorro County Commissions back in 1973.