History souvenir medal of the Mike O’Callahan & Pat Tillman memorial bridge that was a project for vehicles to go across the Colorado River from Nevada to Arizona beside the Hoover Dam, instead of driving on the dam. This medal is 38mm in diameter and weighs 21.7 grams. Reverse is a nice picture of an Indian from the Paiute Indian tribe from Southern Nevada. This is a loose medal and does have blemishes. Look at pictures for condition.