A Portion of US Highway 24 near Leadville is still closed and the Colorado Department of Transportation is hurrying to get the highway fixed. A hundred foot deep sinkhole had opened up next to the highway last week and is continuing to grow. According to engineers with the Colorado Department of Transportation the sinkhole was caused by the collapse of a century old railroad tunnel running under the highway. State historians are working with CDOT to get more information about the tunnel to prevent this happening elsewhere. CDOT will choose a contractor today and the two million dollar project has incentives to finish early. The sinkhole is right on the route for the US Pro Cycling Challenge bike race which starts a little more than a month from now.