Changing over Bismarck/Mandan (between), ND

The report, as filed

My daughter, 10yrs old, boyfriend 27yrs old, and self were driving across The Memorial Bridge and had just come from a helicopter ride in Bismarck, North Dakota (they were giving these to raise money for charity) part of this "ride" was to go up the river. So we were driving over the bridge and watching the helicopter we were just in go up the river, when suddenly this white sphere looking thing appeared in the air (like it just blinked into existence) and was spinning it was about a 1/2 city block from the bridge and hanging over the water, about the size of a geo metro (weird comparison I know lol) it suddenly expanded and started to resemble a wheel with bicycle spokes it was still spinning (clockwise) and had this swirling like mass in the center of it. the wheel, spokes and mass were all a white/grey color and I instantly thought "OMG its a dimensional portal opening!!" I slowed down as there was nobody else on the bridge (which was kinda weird at this time of day) and it expanded to about the size of a basketball court (another weird comparison lol) either way it was huge. and It stayed this size for about 5 seconds. then like stopped spinning and went in reverse and started shrinking in size back to the geo metro size it started with and then got smaller and blinked out of existence. we all saw this object, and once it disappeared I drove down to sit under the bridge to see if it would come back and it did not. while we were down there I made everyone draw what they saw and we all compared drawings and it was weird cause my kid saw some kind of symbols within it. (I will send the drawings of the object for your report. anyway very odd. my brother also had a very strange incident happen at our lake cabin last summer (Lake Sakakawea) that I would like to report. There was missing time involved with my brothers encounter. Anyway that is my report.

Held as-reported from National UFO Reporting Center (record NUFORC #145806). Witness text is preserved verbatim, including its spelling; nothing is edited beyond formatting.