I witnessed a similar event on August 26th.  I saw 740 robins streaming over my yard in groups of 5-12 for 30 minutes.  It was at dusk, 7:45-8:15 pm.  I was watching for nighthawks but only saw 2.  The robins were impressive, flying northeast.   This was seen by 2 of us and by another nearby neighbor.  
Betsy Mac
Northfield Center 
Summit County

Sent from my iPhone

> On Sep 12, 2016, at 9:45 PM, Brad Bolton <[log in to unmask]> wrote:
> 
> Tonight I watched a stream of migrating robins over my house, all flying
> the same direction, just after sunset.  In 20 minutes I counted 600.  I've
> watched grackles and starlings do this (with a higher density of birds than
> tonight's robins), but I have never seen robins stream like this.  Is this
> common for them?
> 
> Brad Bolton, Kent, OH
> 
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