Gray blimp-like object seen in daytime sky and photographed.

When witness first noticed the object, it was over I-77, south bound, slowly heading from E - W about a quarter mile from the exit.  While driving home from an eye appointment, object first seen it was not a plane, blimp or helicopter and observer felt a little anxiety / excited.  Thought it had disappeared until he/she got to next exit where it was behind the trees.  When observer stopped at light I was able to take four pictures using an iPhone 7plus.  From the freeway the object was approximately at 3 o’clock high.  "When I saw the object from the exit ramp it was approximately at 2 o’clock high behind the trees.  There were no lights or sound, the color was dull gray.  Moving very slow and low.  When the light changed I turned left on to the I- 77 overpass then right on to Mull Ave.  As I passed where the trees and object were I could not see it anymore, it’s like it just disappeared.  I had a clear view once I passed the trees.  I should of been able to see it behind or over the trees.  There are no airfields in the area.  I checked the Goodyear blimp schedule for Oct 26th, there were no blimps flying that day.  Temp was 28 degrees, overcast light rain, wind slightly from the North West. (MUFON CMS) 
http://www.nicap.org/match/reports/20181026/images/